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<h1 id="awesome-java-awesome">Awesome Java <a
href="https://awesome.re"><img src="https://awesome.re/badge.svg"
alt="Awesome" /></a></h1>
<p>A curated list of awesome Java frameworks, libraries and
software.</p>
<h2 id="contents">Contents</h2>
<ul>
<li><a href="#projects">Projects</a>
<ul>
<li><a href="#bean-mapping">Bean Mapping</a></li>
<li><a href="#build">Build</a></li>
<li><a href="#bytecode-manipulation">Bytecode Manipulation</a></li>
<li><a href="#caching">Caching</a></li>
<li><a href="#cli">CLI</a></li>
<li><a href="#cluster-management">Cluster Management</a></li>
<li><a href="#code-analysis">Code Analysis</a></li>
<li><a href="#code-coverage">Code Coverage</a></li>
<li><a href="#code-generators">Code Generators</a></li>
<li><a href="#compiler-compiler">Compiler-compiler</a></li>
<li><a href="#computer-vision">Computer Vision</a></li>
<li><a href="#configuration">Configuration</a></li>
<li><a href="#constraint-satisfaction-problem-solver">Constraint
Satisfaction Problem Solver</a></li>
<li><a href="#csv">CSV</a></li>
<li><a href="#data-structures">Data Structures</a></li>
<li><a href="#database">Database</a></li>
<li><a href="#date-and-time">Date and Time</a></li>
<li><a href="#dependency-injection">Dependency Injection</a></li>
<li><a href="#development">Development</a></li>
<li><a href="#distributed-applications">Distributed
Applications</a></li>
<li><a href="#distributed-transactions">Distributed
Transactions</a></li>
<li><a href="#distribution">Distribution</a></li>
<li><a href="#document-processing">Document Processing</a></li>
<li><a href="#financial">Financial</a></li>
<li><a href="#formal-verification">Formal Verification</a></li>
<li><a href="#functional-programming">Functional Programming</a></li>
<li><a href="#game-development">Game Development</a></li>
<li><a href="#geospatial">Geospatial</a></li>
<li><a href="#gui">GUI</a></li>
<li><a href="#high-performance">High Performance</a></li>
<li><a href="#http-clients">HTTP Clients</a></li>
<li><a href="#hypermedia-types">Hypermedia Types</a></li>
<li><a href="#ide">IDE</a></li>
<li><a href="#imagery">Imagery</a></li>
<li><a href="#introspection">Introspection</a></li>
<li><a href="#job-scheduling">Job Scheduling</a></li>
<li><a href="#json">JSON</a></li>
<li><a href="#jvm-and-jdk">JVM and JDK</a></li>
<li><a href="#logging">Logging</a></li>
<li><a href="#machine-learning">Machine Learning</a></li>
<li><a href="#messaging">Messaging</a></li>
<li><a href="#microservice">Microservice</a></li>
<li><a href="#miscellaneous">Miscellaneous</a></li>
<li><a href="#mobile-development">Mobile Development</a></li>
<li><a href="#monitoring">Monitoring</a></li>
<li><a href="#native">Native</a></li>
<li><a href="#natural-language-processing">Natural Language
Processing</a></li>
<li><a href="#networking">Networking</a></li>
<li><a href="#orm">ORM</a></li>
<li><a href="#paas">PaaS</a></li>
<li><a href="#pdf">PDF</a></li>
<li><a href="#performance-analysis">Performance analysis</a></li>
<li><a href="#platform">Platform</a></li>
<li><a href="#processes">Processes</a></li>
<li><a href="#reactive-libraries">Reactive libraries</a></li>
<li><a href="#rest-frameworks">REST Frameworks</a></li>
<li><a href="#science">Science</a></li>
<li><a href="#search">Search</a></li>
<li><a href="#security">Security</a></li>
<li><a href="#serialization">Serialization</a></li>
<li><a href="#server">Server</a></li>
<li><a href="#template-engine">Template Engine</a></li>
<li><a href="#testing">Testing</a></li>
<li><a href="#utility">Utility</a></li>
<li><a href="#version-managers">Version Managers</a></li>
<li><a href="#web-crawling">Web Crawling</a></li>
<li><a href="#web-frameworks">Web Frameworks</a></li>
<li><a href="#workflow-orchestration-engines">Workflow Orchestration
Engines</a></li>
</ul></li>
<li><a href="#resources">Resources</a>
<ul>
<li><a href="#related-awesome-lists">Related Awesome Lists</a></li>
<li><a href="#communities">Communities</a></li>
<li><a href="#frontends">Frontends</a></li>
<li><a href="#influential-books">Influential Books</a></li>
<li><a href="#podcasts-and-screencasts">Podcasts and
Screencasts</a></li>
<li><a href="#people">People</a></li>
<li><a href="#websites">Websites</a></li>
</ul></li>
<li><a href="#contributing">Contributing</a></li>
</ul>
<h2 id="projects">Projects</h2>
<h3 id="bean-mapping">Bean Mapping</h3>
<p><em>Frameworks that ease bean mapping.</em></p>
<ul>
<li><a href="https://github.com/doov-io/doov">dOOv</a> - Provides fluent
API for typesafe domain model validation and mapping. It uses
annotations, code generation and a type safe DSL to make bean validation
and mapping fast and easy.</li>
<li><a
href="https://github.com/jmapper-framework/jmapper-core">JMapper</a> -
Uses byte code manipulation for lightning-fast mapping. Supports
annotations and API or XML configuration.</li>
<li><a href="https://github.com/mapstruct/mapstruct">MapStruct</a> -
Code generator that simplifies mappings between different bean types,
based on a convention-over-configuration approach.</li>
<li><a href="https://github.com/modelmapper/modelmapper">ModelMapper</a>
- Intelligent object mapping library that automatically maps objects to
each other.</li>
<li><a href="https://github.com/orika-mapper/orika">Orika</a> -
JavaBean-mapping framework that recursively copies (among other
capabilities) data from one object to another.</li>
<li><a href="https://github.com/remondis-it/remap">reMap</a> - Lambda
and method handle-based mapping which requires code and not annotations
if objects have different names.</li>
<li><a href="https://github.com/xebia-france/selma">Selma</a> -
Annotation processor-based bean mapper.</li>
</ul>
<h3 id="build">Build</h3>
<p><em>Tools that handle the build cycle and dependencies of an
application.</em></p>
<ul>
<li><a href="https://maven.apache.org">Apache Maven</a> - Declarative
build and dependency management that favors convention over
configuration. It might be preferable to Apache Ant, which uses a rather
procedural approach and can be difficult to maintain.</li>
<li><a href="https://bazel.build">Bazel</a> - Tool from Google that
builds code quickly and reliably.</li>
<li><a href="https://github.com/facebook/buck">Buck</a> - Encourages the
creation of small, reusable modules consisting of code and
resources.</li>
<li><a href="https://gradle.org">Gradle</a> - Incremental builds
programmed via Groovy instead of declaring XML. Works well with Maven’s
dependency management.</li>
</ul>
<h3 id="bytecode-manipulation">Bytecode Manipulation</h3>
<p><em>Libraries to manipulate bytecode programmatically.</em></p>
<ul>
<li><a href="https://asm.ow2.io">ASM</a> - All-purpose, low-level
bytecode manipulation and analysis.</li>
<li><a href="https://bytebuddy.net">Byte Buddy</a> - Further simplifies
bytecode generation with a fluent API.</li>
<li><a
href="https://github.com/Konloch/bytecode-viewer">bytecode-viewer</a> -
Java 8 Jar &amp; Android APK reverse engineering suite.
(GPL-3.0-only)</li>
<li><a href="https://byteman.jboss.org">Byteman</a> - Manipulate
bytecode at runtime via DSL (rules); mainly for testing/troubleshooting.
(LGPL-2.1-or-later)</li>
<li><a href="https://github.com/cglib/cglib">cglib</a> - Bytecode
generation library.</li>
<li><a href="https://github.com/jboss-javassist/javassist">Javassist</a>
- Tries to simplify bytecode editing.</li>
<li><a href="https://github.com/cojen/maker">Maker</a> - Provides low
level bytecode generation.</li>
<li><a href="https://github.com/SpongePowered/Mixin">Mixin</a> -
Manipulate bytecode at runtime using real Java code.</li>
<li><a href="https://github.com/nicolasmanic/perses">Perses</a> -
Dynamically injects failure/latency at the bytecode level according to
principles of chaos engineering.</li>
<li><a href="https://www.coley.software/Recaf/">Recaf</a> - JVM reverse
engineering toolkit, essentially an IDE for Java bytecode.</li>
</ul>
<h3 id="caching">Caching</h3>
<p><em>Libraries that provide caching facilities.</em></p>
<ul>
<li><a href="https://cache2k.org">cache2k</a> - In-memory high
performance caching library.</li>
<li><a href="https://github.com/ben-manes/caffeine">Caffeine</a> -
High-performance, near-optimal caching library.</li>
<li><a href="http://www.ehcache.org">Ehcache</a> - Distributed
general-purpose cache.</li>
<li><a href="https://infinispan.org">Infinispan</a> - Highly concurrent
key/value datastore used for caching.</li>
</ul>
<h3 id="cli">CLI</h3>
<p><em>Libraries for everything related to the CLI.</em></p>
<h4 id="argument-parsing">Argument Parsing</h4>
<p><em>Libraries to assist with parsing command line arguments.</em></p>
<ul>
<li><a href="https://rvesse.github.io/airline/">Airline</a> -
Annotation-based framework for parsing Git-like command-line
arguments.</li>
<li><a href="http://jcommander.org">JCommander</a> - Command-line
argument-parsing framework with custom types and validation via
implementing interfaces.</li>
<li><a href="https://github.com/jbock-java/jbock">jbock</a> -
Reflectionless command line parser.</li>
<li><a href="https://github.com/jline/jline3">JLine</a> - Includes
features from modern shells like completion or history.</li>
<li><a href="https://picocli.info">picocli</a> - ANSI colors and styles
in usage help with annotation-based POSIX/GNU/any syntax, subcommands,
strong typing for both options and positional args.</li>
</ul>
<h4 id="text-based-user-interfaces">Text-Based User Interfaces</h4>
<p><em>Libraries that provide TUI frameworks, or building blocks related
functions.</em></p>
<ul>
<li><a href="https://github.com/fusesource/jansi">Jansi</a> - ANSI
escape codes to format console output.</li>
<li><a href="https://gitlab.com/AutumnMeowMeow/jexer">Jexer</a> -
Advanced console (and Swing) text user interface (TUI) library, with
mouse-draggable windows, built-in terminal window manager, and sixel
image support. Looks like <a
href="https://en.wikipedia.org/wiki/Turbo_Vision">Turbo Vision</a>.</li>
<li><a href="https://github.com/beryx/text-io">Text-IO</a> - Aids the
creation of full console-based applications.</li>
<li><a href="https://github.com/mabe02/lanterna">Lanterna</a> - Easy
console text-GUI library, similar to curses. (LGPL-3.0-only)</li>
</ul>
<h3 id="cluster-management">Cluster Management</h3>
<p><em>Frameworks that can dynamically manage applications inside of a
cluster.</em></p>
<ul>
<li><a href="https://aurora.apache.org">Apache Aurora</a> - Mesos
framework for long-running services and cron jobs.</li>
<li><a href="http://getsingularity.com">Singularity</a> - Mesos
framework that makes deployment and operations easy. It supports web
services, background workers, scheduled jobs, and one-off tasks.</li>
</ul>
<h3 id="code-analysis">Code Analysis</h3>
<p><em>Tools that provide metrics and quality measurements.</em></p>
<ul>
<li><a href="https://github.com/checkstyle/checkstyle">Checkstyle</a> -
Static analysis of coding conventions and standards.
(LGPL-2.1-or-later)</li>
<li><a href="https://github.com/google/error-prone">Error Prone</a> -
Catches common programming mistakes as compile-time errors.</li>
<li><a
href="https://github.com/PicnicSupermarket/error-prone-support">Error
Prone Support</a> - Error Prone extensions: extra bug checkers and a
large battery of Refaster templates.</li>
<li><a href="https://github.com/facebook/infer">Infer</a> - Modern
static analysis tool for verifying the correctness of code.</li>
<li><a href="https://jqassistant.org">jQAssistant</a> - Static code
analysis with Neo4J-based query language. (GPL-3.0-only)</li>
<li><a href="https://github.com/uber/NullAway">NullAway</a> - Eliminates
NullPointerExceptions with low build-time overhead.</li>
<li><a href="https://github.com/pmd/pmd">PMD</a> - Source code analysis
for finding bad coding practices.</li>
<li><a href="https://github.com/alibaba/p3c">p3c</a> - Provides
Alibaba’s coding guidelines for PMD, IDEA and Eclipse.</li>
<li><a
href="https://github.com/jimbethancourt/RefactorFirst">RefactorFirst</a>
- Identifies and prioritizes God Classes and Highly Coupled
classes.</li>
<li><a href="https://github.com/SonarSource/sonar-java">SonarJava</a> -
Static analyzer for SonarQube &amp; SonarLint. (LGPL-3.0-only)</li>
<li><a href="https://github.com/INRIA/spoon">Spoon</a> - Library for
analyzing and transforming Java source code.</li>
<li><a href="https://github.com/spotbugs/spotbugs">Spotbugs</a> - Static
analysis of bytecode to find potential bugs. (LGPL-2.1-only)</li>
</ul>
<h3 id="code-coverage">Code Coverage</h3>
<p><em>Frameworks and tools that enable code coverage metrics collection
for test suites.</em></p>
<ul>
<li><a href="https://www.atlassian.com/software/clover">Clover</a> -
Relies on source-code instrumentation instead of bytecode
instrumentation.</li>
<li><a href="https://cobertura.github.io/cobertura/">Cobertura</a> -
Relies on offline (or static) bytecode instrumentation and class loading
to collect code coverage metrics. (GPL-2.0-only)</li>
<li><a href="https://www.eclemma.org/jacoco/">JaCoCo</a> - Framework
that enables collection of code coverage metrics, using both offline and
runtime bytecode instrumentation.</li>
</ul>
<h3 id="code-generators">Code Generators</h3>
<p><em>Tools that generate patterns for repetitive code in order to
reduce verbosity and error-proneness.</em></p>
<ul>
<li><a href="https://github.com/sviperll/adt4j">ADT4J</a> - JSR-269 code
generator for algebraic data types.</li>
<li><a href="https://github.com/google/auto">Auto</a> - Generates
factory, service, and value classes.</li>
<li><a href="https://avaje.io/http/">Avaje Http Server</a> - Generates
Lightweight JAX-RS style http servers using Javalin or Helidon (Nima)
SE.</li>
<li><a href="https://bootify.io">Bootify <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Browser-based Spring Boot app generation with JPA model
and REST API.</li>
<li><a href="https://github.com/inferred/FreeBuilder">FreeBuilder</a> -
Automatically generates the Builder pattern.</li>
<li><a href="https://github.com/verhas/javageci">Geci</a> - Discovers
files that need generated code, updates automatically and writes to the
source with a convenient API.</li>
<li><a href="https://immutables.github.io">Immutables</a> - Annotation
processors to generate simple, safe and consistent value objects.</li>
<li><a href="https://github.com/square/javapoet">JavaPoet</a> - API to
generate source files.</li>
<li><a
href="https://github.com/jhipster/generator-jhipster">JHipster</a> -
Yeoman source code generator for Spring Boot and AngularJS.</li>
<li><a href="https://www.joda.org/joda-beans/">Joda-Beans</a> - Small
framework that adds queryable properties to Java, enhancing
JavaBeans.</li>
<li><a href="https://www.jpa-buddy.com">JPA Buddy <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Plugin for IntelliJ IDEA. Provides visual tools for
generating JPA entities, Spring Data JPA repositories, Liquibase
changelogs and SQL scripts. Offers automatic Liquibase/Flyway script
generation by comparing model to DB, and reverse engineering JPA
entities from DB tables.</li>
<li><a href="https://projectlombok.org">Lombok</a> - Code generator that
aims to reduce verbosity.</li>
<li><a
href="https://github.com/Randgalt/record-builder">Record-Builder</a> -
Companion builder class, withers and templates for Java records.</li>
<li><a href="https://www.telosys.org/">Telosys</a> - Simple and light
code generator available as an Eclipse Plugin and also as a CLI.</li>
</ul>
<h3 id="compiler-compiler">Compiler-compiler</h3>
<p><em>Frameworks that help to create parsers, interpreters or
compilers.</em></p>
<ul>
<li><a href="https://www.antlr.org">ANTLR</a> - Complex full-featured
framework for top-down parsing.</li>
<li><a href="https://javacc.github.io/javacc/">JavaCC</a> - Parser
generator that generates top-down parsers. Allows lexical state
switching and permits extended BNF specifications.</li>
<li><a href="https://jflex.de">JFlex</a> - Lexical analyzer
generator.</li>
</ul>
<h3 id="computer-vision">Computer Vision</h3>
<p><em>Libraries which seek to gain high level information from images
and videos.</em></p>
<ul>
<li><a href="https://boofcv.org">BoofCV</a> - Library for image
processing, camera calibration, tracking, SFM, MVS, 3D vision, QR Code
and much more.</li>
<li><a href="https://imagej.net/ImageJ">ImageJ</a> - Medical image
processing application with an API.</li>
<li><a href="https://github.com/bytedeco/javacv">JavaCV</a> - Java
interface to OpenCV, FFmpeg, and much more.</li>
</ul>
<h3 id="configuration">Configuration</h3>
<p><em>Libraries that provide external configuration.</em></p>
<ul>
<li><a href="https://avaje.io/config/">avaje config</a> - Loads yaml and
properties files, supports dynamic configuration, plugins, file-watching
and config event listeners.</li>
<li><a href="https://github.com/line/centraldogma">centraldogma</a> -
Highly-available version-controlled service configuration repository
based on Git, ZooKeeper and HTTP/2.</li>
<li><a href="https://github.com/lightbend/config">config</a> -
Configuration library supporting Java properties, JSON or its human
optimized superset HOCON.</li>
<li><a
href="https://github.com/SpongePowered/Configurate">Configurate</a> -
Configuration library with support for various configuration formats and
transformations.</li>
<li><a href="https://curator.apache.org/">Curator Framework</a> -
High-level API for Apache ZooKeeper.</li>
<li><a href="https://github.com/shyiko/dotenv">dotenv</a> -
Twelve-factor configuration library which uses environment-specific
files.</li>
<li><a
href="https://github.com/joel-jeremy/externalized-properties">Externalized
Properties</a> - Lightweight yet powerful configuration library which
supports resolution of properties from external sources and an
extensible post-processing/conversion mechanism.</li>
<li><a href="https://github.com/gestalt-config/gestalt">Gestalt</a> -
Gestalt offers a comprehensive solution to the challenges of
configuration management. It allows you to source configuration data
from multiple inputs, merge them intelligently, and present them in a
structured, type-safe manner.</li>
<li><a href="http://ini4j.sourceforge.net">ini4j</a> - Provides an API
for handling Windows’ INI files.</li>
<li><a href="https://github.com/mariomac/kaconf">KAConf</a> -
Annotation-based configuration system for Java and Kotlin.</li>
<li><a href="https://microconfig.io">microconfig</a> - Configuration
system designed for microservices which helps to separate configuration
from code. The configuration for different services can have common and
specific parts and can be dynamically distributed.</li>
<li><a href="https://github.com/lviggiano/owner">owner</a> - Reduces
boilerplate of properties.</li>
</ul>
<h3 id="constraint-satisfaction-problem-solver">Constraint Satisfaction
Problem Solver</h3>
<p><em>Libraries that help with implementing optimization and
satisfiability problems.</em></p>
<ul>
<li><a href="https://choco-solver.org">Choco</a> - Off-the-shelf
constraint satisfaction problem solver that uses constraint programming
techniques.</li>
<li><a href="https://github.com/radsz/jacop">JaCoP</a> - Includes an
interface for the FlatZinc language, enabling it to execute MiniZinc
models. (AGPL-3.0)</li>
<li><a href="https://www.optaplanner.org">OptaPlanner</a> - Business
planning and resource scheduling optimization solver.</li>
<li><a href="https://timefold.ai/docs">Timefold</a> - Flexible solver
with Spring/Quarkus support and quickstarts for the Vehicle Routing
Problem, Maintenance Scheduling, Employee Shift Scheduling and much
more.</li>
</ul>
<h3 id="csv">CSV</h3>
<p><em>Frameworks and libraries that simplify reading/writing CSV
data.</em></p>
<ul>
<li><a href="https://github.com/osiegmar/FastCSV">FastCSV</a> -
Performance-optimized, dependency-free and RFC 4180 compliant.</li>
<li><a
href="https://github.com/FasterXML/jackson-dataformat-csv">jackson-dataformat-csv</a>
- Jackson extension for reading and writing CSV.</li>
<li><a href="http://opencsv.sourceforge.net">opencsv</a> - Simple CSV
parser.</li>
<li><a href="https://super-csv.github.io/super-csv/">Super CSV</a> -
Powerful CSV parser with support for Dozer, Joda-Time and Java 8.</li>
<li><a
href="https://github.com/uniVocity/univocity-parsers">uniVocity-parsers</a>
- One of the fastest and most feature-complete parsers. Also comes with
parsers for TSV and fixed-width records.</li>
</ul>
<h3 id="data-structures">Data Structures</h3>
<p><em>Efficient and specific data structures.</em></p>
<ul>
<li><a href="https://avro.apache.org">Apache Avro</a> - Data interchange
format with dynamic typing, untagged data, and absence of manually
assigned IDs.</li>
<li><a href="https://orc.apache.org">Apache Orc</a> - Fast and efficient
columnar storage format for Hadoop-based workloads.</li>
<li><a href="https://parquet.apache.org">Apache Parquet</a> - Columnar
storage format based on assembly algorithms from Google’s paper on
Dremel.</li>
<li><a href="https://thrift.apache.org">Apache Thrift</a> - Data
interchange format that originated at Facebook.</li>
<li><a href="https://github.com/bulldog2011/bigqueue">Big Queue</a> -
Fast and persistent queue based on memory-mapped files.</li>
<li><a
href="https://github.com/LiveRamp/HyperMinHash-java">HyperMinHash-java</a>
- Probabilistic data structure for computing union, intersection, and
set cardinality in loglog space.</li>
<li><a href="https://github.com/hrldcpr/pcollections">Persistent
Collection</a> - Persistent and immutable analogue of the Java
Collections Framework.</li>
<li><a href="https://github.com/protocolbuffers/protobuf">Protobuf</a> -
Google’s data interchange format.</li>
<li><a
href="https://github.com/RoaringBitmap/RoaringBitmap">RoaringBitmap</a>
- Fast and efficient compressed bitmap.</li>
<li><a
href="https://github.com/real-logic/simple-binary-encoding">SBE</a> -
Simple Binary Encoding, one of the fastest message formats around.</li>
<li><a href="https://github.com/square/tape">Tape</a> - Lightning-fast,
transactional, file-based FIFO.</li>
<li><a href="https://github.com/square/wire">Wire</a> - Clean,
lightweight protocol buffers.</li>
</ul>
<h3 id="database">Database</h3>
<p><em>Everything that simplifies interactions with the
database.</em></p>
<ul>
<li><a href="https://calcite.apache.org">Apache Calcite</a> - Dynamic
data management framework. It contains many of the pieces that comprise
a typical database management system.</li>
<li><a href="https://drill.apache.org">Apache Drill</a> - Distributed,
schema on-the-fly, ANSI SQL query engine for Big Data exploration.</li>
<li><a href="https://phoenix.apache.org">Apache Phoenix</a> -
High-performance relational database layer over HBase for low-latency
applications.</li>
<li><a
href="https://github.com/arangodb/arangodb-java-driver">ArangoDB</a> -
ArangoDB Java driver.</li>
<li><a href="https://github.com/OpenHFT/Chronicle-Map">Chronicle Map</a>
- Efficient, in-memory (opt. persisted to disk), off-heap key-value
store.</li>
<li><a href="https://debezium.io/">Debezium</a> - Low latency data
streaming platform for change data capture.</li>
<li><a href="https://druid.apache.org">druid</a> - High-performance,
column-oriented, distributed data store.</li>
<li><a href="https://github.com/eXist-db/exist">eXist</a> - NoSQL
document database and application platform. (LGPL-2.1-only)</li>
<li><a href="https://github.com/vladmihalcea/flexy-pool">FlexyPool</a> -
Brings metrics and failover strategies to the most common connection
pooling solutions.</li>
<li><a href="https://flywaydb.org">Flyway</a> - Simple database
migration tool.</li>
<li><a href="https://h2database.com">H2</a> - Small SQL database notable
for its in-memory functionality.</li>
<li><a href="https://github.com/brettwooldridge/HikariCP">HikariCP</a> -
High-performance JDBC connection pool.</li>
<li><a href="https://hsqldb.org/">HSQLDB</a> - HyperSQL 100% Java
database.</li>
<li><a href="http://jdbi.org">JDBI</a> - Convenient abstraction of
JDBC.</li>
<li><a href="https://github.com/xetorthio/jedis">Jedis</a> - Small
client for interaction with Redis, with methods for commands.</li>
<li><a href="https://github.com/searchbox-io/Jest">Jest</a> - Client for
the Elasticsearch REST API.</li>
<li><a href="https://github.com/justinsb/jetcd">jetcd</a> - Client
library for etcd.</li>
<li><a href="https://github.com/my2iu/Jinq">Jinq</a> - Typesafe database
queries via symbolic execution of Java 8 Lambdas (on top of JPA or
jOOQ).</li>
<li><a href="https://www.jooq.org">jOOQ</a> - Generates typesafe code
based on SQL schema.</li>
<li><a href="https://github.com/Meituan-Dianping/Leaf">Leaf</a> -
Distributed ID generate service.</li>
<li><a href="https://lettuce.io/">Lettuce</a> - Lettuce is a scalable
Redis client for building non-blocking Reactive applications.</li>
<li><a href="http://www.liquibase.org">Liquibase</a> -
Database-independent library for tracking, managing and applying
database schema changes.</li>
<li><a href="http://www.mapdb.org">MapDB</a> - Embedded database engine
that provides concurrent collections backed on disk or in off-heap
memory.</li>
<li><a href="https://github.com/vorburger/MariaDB4j">MariaDB4j</a> -
Launcher for MariaDB that requires no installation or external
dependencies.</li>
<li><a href="https://github.com/arkanovicz/modality">Modality</a> -
Lightweight ORM with database reverse engineering features.</li>
<li><a href="https://github.com/OpenIdentityPlatform/OpenDJ">OpenDJ</a>
- LDAPv3 compliant directory service, developed for the Java platform,
providing a high performance, highly available, and secure store for the
identities.</li>
<li><a href="http://www.querydsl.com">Querydsl</a> - Typesafe unified
queries.</li>
<li><a href="https://github.com/querystream/querystream">QueryStream</a>
- Build JPA Criteria queries using a Stream-like API.</li>
<li><a href="https://github.com/questdb/questdb">QuestDB</a> -
High-performance SQL database for time series. Supports InfluxDB line
protocol, PostgreSQL wire protocol, and REST.</li>
<li><a href="https://github.com/realm/realm-java">Realm</a> - Mobile
database to run directly inside phones, tablets or wearables.</li>
<li><a href="https://github.com/redisson/redisson">Redisson</a> - Allows
for distributed and scalable data structures on top of a Redis
server.</li>
<li><a href="https://github.com/requery/requery">requery</a> - Modern,
lightweight but powerful object mapping and SQL generator. Easily map to
or create databases, or perform queries and updates from any Java-using
platform.</li>
<li><a href="https://github.com/speedment/speedment">Speedment</a> -
Database access library that utilizes Java 8’s Stream API for
querying.</li>
<li><a
href="https://github.com/mhewedy/spring-data-jpa-mongodb-expressions">Spring
Data JPA MongoDB Expressions</a> - Allows you to use MongoDB query
language to query your relational database.</li>
<li><a href="https://trino.io">Trino</a> - Distributed SQL query engine
for big data.</li>
<li><a href="https://www.vibur.org">Vibur DBCP</a> - JDBC connection
pool library with advanced performance monitoring capabilities.</li>
<li><a href="https://github.com/JetBrains/xodus">Xodus</a> - Highly
concurrent transactional schema-less and ACID-compliant embedded
database.</li>
<li><a href="https://github.com/Ahoo-Wang/CosId">CosId</a> - Universal,
flexible, high-performance distributed ID generator.</li>
</ul>
<h3 id="date-and-time">Date and Time</h3>
<p><em>Libraries related to handling date and time.</em></p>
<ul>
<li><a href="https://github.com/ical4j/ical4j">iCal4j</a> - Parse and
build iCalendar <a href="https://tools.ietf.org/html/rfc5545">RFC
5545</a> data models.</li>
<li><a href="https://github.com/svendiedrichsen/jollyday">Jollyday</a> -
Determines the holidays for a given year, country/name and eventually
state/region.</li>
<li><a
href="https://github.com/ThreeTen/threeten-extra">ThreeTen-Extra</a> -
Additional date-time classes that complement those in JDK 8.</li>
<li><a href="https://github.com/MenoData/Time4J">Time4J</a> - Advanced
date and time library. (LGPL-2.1-only)</li>
</ul>
<h3 id="dependency-injection">Dependency Injection</h3>
<p><em>Libraries that help to realize the <a
href="https://en.wikipedia.org/wiki/Inversion_of_control">Inversion of
Control</a> paradigm.</em></p>
<ul>
<li><a href="https://deltaspike.apache.org">Apache DeltaSpike</a> - CDI
extension framework.</li>
<li><a href="https://avaje.io/inject/">Avaje Inject</a> -
Microservice-focused compile-time injection framework without
reflection.</li>
<li><a href="https://dagger.dev/">Dagger</a> - Compile-time injection
framework without reflection.</li>
<li><a href="https://github.com/zsoltherpai/feather">Feather</a> -
Ultra-lightweight, JSR-330-compliant dependency injection library.</li>
<li><a href="https://github.com/Netflix/governator">Governator</a> -
Extensions and utilities that enhance Google Guice.</li>
<li><a href="https://github.com/google/guice">Guice</a> - Lightweight
and opinionated framework that completes Dagger.</li>
<li><a href="https://javaee.github.io/hk2/">HK2</a> - Lightweight and
dynamic dependency injection framework.</li>
<li><a href="https://github.com/vanillasource/jaywire">JayWire</a> -
Lightweight dependency injection framework. (LGPL-3.0-only)</li>
</ul>
<h3 id="development">Development</h3>
<p><em>Augmentation of the development process at a fundamental
level.</em></p>
<ul>
<li><a href="https://www.eclipse.org/aspectj/">AspectJ</a> - Seamless
aspect-oriented programming extension.</li>
<li><a href="https://dcevm.github.io">DCEVM</a> - JVM modification that
allows unlimited redefinition of loaded classes at runtime.
(GPL-2.0-only)</li>
<li><a href="https://github.com/zalando/faux-pas">Faux Pas</a> - Library
that simplifies error handling by circumventing the issue that none of
the functional interfaces in the Java Runtime is allowed by default to
throw checked exceptions.</li>
<li><a
href="https://github.com/HotswapProjects/HotswapAgent">HotswapAgent</a>
- Unlimited runtime class and resource redefinition. (GPL-2.0-only)</li>
<li><a href="https://github.com/javaparser/javaparser">JavaParser</a> -
Parse, modify and generate Java code.</li>
<li><a
href="https://github.com/javaparser/javasymbolsolver">JavaSymbolSolver</a>
- Symbol solver.</li>
<li><a href="https://github.com/manifold-systems/manifold">Manifold</a>
- Re-energizes Java with powerful features like type-safe
metaprogramming, structural typing and extension methods.</li>
<li><a href="https://noexception.machinezoo.com">NoException</a> -
Allows checked exceptions in functional interfaces and converts
exceptions to Optional return.</li>
<li><a
href="https://github.com/rainerhahnekamp/sneakythrow">SneakyThrow</a> -
Ignores checked exceptions without bytecode manipulation. Can also be
used inside Java 8 stream operations.</li>
<li><a href="https://nrktkt.github.io/tail/">Tail</a> - Enable infinite
recursion using tail call optimization.</li>
</ul>
<h3 id="distributed-applications">Distributed Applications</h3>
<p><em>Libraries and frameworks for writing distributed and
fault-tolerant applications.</em></p>
<ul>
<li><a href="https://geode.apache.org">Apache Geode</a> - In-memory data
management system that provides reliable asynchronous event
notifications and guaranteed message delivery.</li>
<li><a href="https://storm.apache.org">Apache Storm</a> - Realtime
computation system.</li>
<li><a href="https://zookeeper.apache.org">Apache ZooKeeper</a> -
Coordination service with distributed configuration, synchronization,
and naming registry for large distributed systems.</li>
<li><a href="https://atomix.io">Atomix</a> - Fault-tolerant distributed
coordination framework.</li>
<li><a href="https://axoniq.io">Axon</a> - Framework for creating CQRS
applications.</li>
<li><a
href="https://github.com/mtakaki/dropwizard-circuitbreaker">Dropwizard
Circuit Breaker</a> - Circuit breaker design pattern for Dropwizard.
(GPL-2.0-only)</li>
<li><a href="https://github.com/jhalterman/failsafe">Failsafe</a> -
Simple failure handling with retries and circuit breakers.</li>
<li><a href="https://github.com/hazelcast/hazelcast">Hazelcast</a> -
Highly scalable in-memory datagrid with a free open-source version.</li>
<li><a href="http://www.jgroups.org">JGroups</a> - Toolkit for reliable
messaging and cluster creation.</li>
<li><a href="http://docs.paralleluniverse.co/quasar/">Quasar</a> -
Lightweight threads and actors for the JVM.</li>
<li><a
href="https://github.com/resilience4j/resilience4j">resilience4j</a> -
Functional fault tolerance library.</li>
<li><a href="https://github.com/OpenIdentityPlatform/OpenIG">OpenIG</a>
- High-performance reverse proxy server with specialized session
management and credential replay functionality.</li>
<li><a href="https://github.com/scalecube/scalecube-services">ScaleCube
Services</a> - Embeddable Cluster-Membership library based on SWIM and
gossip protocol.</li>
<li><a href="https://github.com/Netflix/zuul">Zuul</a> - Gateway service
that provides dynamic routing, monitoring, resiliency, security, and
more.</li>
</ul>
<h3 id="distributed-transactions">Distributed Transactions</h3>
<p><em>Distributed transactions provide a mechanism for ensuring
consistency of data updates in the presence of concurrent access and
partial failures.</em></p>
<ul>
<li><a href="https://www.atomikos.com">Atomikos</a> - Provides
transactions for REST, SOA and microservices with support for JTA and
XA.</li>
<li><a href="https://github.com/bitronix/btm">Bitronix</a> - Simple but
complete implementation of the JTA 1.1 API.</li>
<li><a href="https://narayana.io">Narayana</a> - Provides support for
traditional ACID and compensation transactions, also complies with JTA,
JTS and other standards. (LGPL-2.1-only)</li>
<li><a href="https://github.com/seata/seata">Seata</a> - Delivers high
performance and easy to use distributed transaction services under a
microservices architecture.</li>
</ul>
<h3 id="distribution">Distribution</h3>
<p><em>Tools that handle the distribution of applications in native
formats.</em></p>
<ul>
<li><a href="https://github.com/artipie/artipie">Artipie</a> - Binary
artifact management toolkit which hosts them on the file system or
S3.</li>
<li><a href="https://boxfuse.com">Boxfuse <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Deployment of JVM applications to AWS using the
principles of immutable infrastructure.</li>
<li><a href="https://github.com/puniverse/capsule">Capsule</a> - Simple
and powerful packaging and deployment. A fat JAR on steroids, or a
“Docker for Java” that supports JVM-optimized containers.</li>
<li><a href="https://search.maven.org">Central Repository</a> - Largest
binary component repository available as a free service to the
open-source community. Default used by Apache Maven, and available in
all other build tools.</li>
<li><a href="https://cloudsmith.io">Cloudsmith <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Fully managed package management SaaS with support for
Maven/Gradle/SBT with a free tier.</li>
<li><a href="https://github.com/threerings/getdown">Getdown</a> - System
for deploying Java applications to end-user computers and keeping them
up to date. Developed as an alternative to Java Web Start.</li>
<li><a href="http://izpack.org">IzPack</a> - Setup authoring tool for
cross-platform deployments.</li>
<li><a href="https://github.com/fvarrui/JavaPackager">JavaPackager</a> -
Maven and Gradle plugin which provides an easy way to package Java
applications in native Windows, macOS or GNU/Linux executables, and
generate installers for them.</li>
<li><a href="https://www.jdeploy.com">jDeploy</a> - Deploy desktop apps
as native Mac, Windows or Linux bundles.</li>
<li><a
href="https://github.com/AdoptOpenJDK/jlink.online">jlink.online</a> -
Builds optimized runtimes over HTTP.</li>
<li><a href="https://www.sonatype.com">Nexus <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Binary management with proxy and caching
capabilities.</li>
<li><a href="https://github.com/libgdx/packr">packr</a> - Packs JARs,
assets and the JVM for native distribution on Windows, Linux and
macOS.</li>
<li><a
href="https://github.com/brianm/really-executable-jars-maven-plugin">really-executable-jars-maven-plugin</a>
- Maven plugin for making self-executing JARs.</li>
</ul>
<h3 id="document-processing">Document Processing</h3>
<p><em>Libraries that assist with processing office document
formats.</em></p>
<ul>
<li><a href="https://poi.apache.org">Apache POI</a> - Supports OOXML
(XLSX, DOCX, PPTX) as well as OLE2 (XLS, DOC or PPT).</li>
<li><a href="https://documents4j.com/#/">documents4j</a> - API for
document format conversion using third-party converters such as MS
Word.</li>
<li><a href="https://www.docx4java.org/trac/docx4j">docx4j</a> - Create
and manipulate Microsoft Open XML files.</li>
<li><a href="https://github.com/dhatim/fastexcel">fastexcel</a> - High
performance library to read and write large Excel (XLSX)
worksheets.</li>
<li><a href="https://github.com/creditdatamw/zerocell">zerocell</a> -
Annotation-based API for reading data from Excel sheets into POJOs with
focus on reduced overhead.</li>
</ul>
<h3 id="financial">Financial</h3>
<p><em>Libraries related to the financial domain.</em></p>
<ul>
<li><a
href="https://github.com/cassandre-tech/cassandre-trading-bot">Cassandre</a>
- Trading bot framework.</li>
<li><a href="https://github.com/paritytrading/parity">Parity</a> -
Platform for trading venues.</li>
<li><a
href="https://github.com/paritytrading/philadelphia">Philadelphia</a> -
Low-latency financial information exchange.</li>
<li><a href="https://github.com/square/connect-java-sdk">Square</a> -
Integration with the Square API.</li>
<li><a href="https://github.com/stripe/stripe-java">Stripe</a> -
Integration with the Stripe API.</li>
<li><a href="https://github.com/ta4j/ta4j">ta4j</a> - Library for
technical analysis.</li>
</ul>
<h3 id="formal-verification">Formal Verification</h3>
<p><em>Formal-methods tools: proof assistants, model checking, symbolic
execution, etc.</em></p>
<ul>
<li><a href="https://github.com/ksen007/janala2">CATG</a> - Concolic
unit testing engine. Automatically generates unit tests using formal
methods.</li>
<li><a href="https://checkerframework.org">Checker Framework</a> -
Pluggable type systems. Includes nullness types, physical units,
immutability types and more. (GPL-2.0-only WITH
Classpath-exception-2.0)</li>
<li><a href="https://plse.cs.washington.edu/daikon/">Daikon</a> -
Detects likely program invariants and generates JML specs based on those
invariants.</li>
<li><a href="https://github.com/javapathfinder/jpf-core">Java Path
Finder (JPF)</a> - JVM formal verification tool containing a model
checker and more. Created by NASA.</li>
<li><a href="https://massoni.computacao.ufcg.edu.br/home/jmlok">JMLOK
2.0</a> - Detects inconsistencies between code and JML specification
through feedback-directed random tests generation, and suggests a likely
cause for each nonconformance detected. (GPL-3.0-only)</li>
<li><a href="https://www.key-project.org">KeY</a> - Formal software
development tool that aims to integrate design, implementation, formal
specification, and formal verification of object-oriented software as
seamlessly as possible. Uses JML for specification and symbolic
execution for verification. (GPL-2.0-or-later)</li>
<li><a href="http://www.openjml.org">OpenJML</a> - Translates JML
specifications into SMT-LIB format and passes the proof problems implied
by the program to backend solvers. (GPL-2.0-only)</li>
</ul>
<h3 id="functional-programming">Functional Programming</h3>
<p><em>Libraries that facilitate functional programming.</em></p>
<ul>
<li><a href="https://github.com/aol/cyclops">Cyclops</a> - Monad and
stream utilities, comprehensions, pattern matching, functional
extensions for all JDK collections, future streams, trampolines and much
more.</li>
<li><a href="https://github.com/derive4j/derive4j">derive4j</a> - Java 8
annotation processor and framework for deriving algebraic data types
constructors, pattern-matching and morphisms. (GPL-3.0-only)</li>
<li><a href="https://bitbucket.org/atlassian/fugue">Fugue</a> -
Functional extensions to Guava.</li>
<li><a href="http://www.functionaljava.org">Functional Java</a> -
Implements numerous basic and advanced programming abstractions that
assist composition-oriented development.</li>
<li><a href="https://github.com/jOOQ/jOOL">jOOλ</a> - Extension to Java
8 that aims to fix gaps in lambda by providing numerous missing types
and a rich set of sequential Stream API additions.</li>
<li><a href="https://github.com/poetix/protonpack">protonpack</a> -
Collection of stream utilities.</li>
<li><a href="https://github.com/amaembo/streamex">StreamEx</a> -
Enhances Java 8 Streams.</li>
<li><a href="https://www.vavr.io">Vavr</a> - Functional component
library that provides persistent data types and functional control
structures.</li>
</ul>
<h3 id="game-development">Game Development</h3>
<p><em>Frameworks that support the development of games.</em></p>
<ul>
<li><a href="https://almasb.github.io/FXGL/">FXGL</a> - JavaFX Game
Development Framework.</li>
<li><a href="http://www.jbox2d.org/">JBox2D</a> - Port of the renowned
C++ 2D physics engine.</li>
<li><a href="https://jmonkeyengine.org">jMonkeyEngine</a> - Game engine
for modern 3D development.</li>
<li><a href="https://libgdx.com">libGDX</a> - All-round cross-platform,
high-level framework.</li>
<li><a href="https://litiengine.com/">Litiengine</a> - AWT-based,
lightweight 2D game engine.</li>
<li><a href="https://www.lwjgl.org">LWJGL</a> - Robust framework that
abstracts libraries like OpenGL/CL/AL.</li>
<li><a href="https://mini2dx.org">Mini2Dx</a> - Beginner-friendly,
master-ready framework for rapidly prototyping and building 2D
games.</li>
<li><a href="https://github.com/xzripper/Void2D">Void2D</a> - High-level
2D game engine with built-in physics based on Swing.</li>
</ul>
<h3 id="geospatial">Geospatial</h3>
<p><em>Libraries for working with geospatial data and
algorithms.</em></p>
<ul>
<li><a href="https://sis.apache.org">Apache SIS</a> - Library for
developing geospatial applications.</li>
<li><a
href="https://github.com/Esri/arcgis-maps-sdk-java-samples/">ArcGIS Maps
SDK for Java <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - JavaFX library for adding mapping and GIS functionality
to desktop apps.</li>
<li><a href="https://github.com/davidmoten/geo">Geo</a> - GeoHash
utilities in Java.</li>
<li><a href="https://geotools.org">GeoTools</a> - Library that provides
tools for geospatial data. (LGPL-2.1-only)</li>
<li><a href="https://github.com/graphhopper/graphhopper">GraphHopper</a>
- Road-routing engine. Used as a Java library or standalone web
service.</li>
<li><a href="http://www.h2gis.org">H2GIS</a> - Spatial extension of the
H2 database. (LGPL-3.0-only)</li>
<li><a href="https://astrapi69.github.io/jgeohash/">Jgeohash</a> -
Library for using the GeoHash algorithm.</li>
<li><a href="https://github.com/mapsforge/mapsforge">Mapsforge</a> - Map
rendering based on OpenStreetMap data. (LGPL-3.0-only)</li>
<li><a href="https://github.com/locationtech/spatial4j">Spatial4j</a> -
General-purpose spatial/geospatial library.</li>
</ul>
<h3 id="gui">GUI</h3>
<p><em>Libraries to create modern graphical user interfaces.</em></p>
<ul>
<li><a
href="https://wiki.openjdk.java.net/display/OpenJFX/Main">JavaFX</a> -
Successor of Swing.</li>
<li><a href="https://gluonhq.com/products/scene-builder/">Scene
Builder</a> - Visual layout tool for JavaFX applications.</li>
<li><a href="https://github.com/reportmill/SnapKit">SnapKit</a> - Modern
Java UI library for both desktop and web.</li>
<li><a href="https://www.eclipse.org/swt/">SWT</a> - Graphical widget
toolkit.</li>
</ul>
<h3 id="high-performance">High Performance</h3>
<p><em>Everything about high-performance computation, from collections
to specific libraries.</em></p>
<ul>
<li><a href="https://github.com/real-logic/Agrona">Agrona</a> - Data
structures and utility methods that are common in high-performance
applications.</li>
<li><a href="https://lmax-exchange.github.io/disruptor/">Disruptor</a> -
Inter-thread messaging library.</li>
<li><a href="https://github.com/eclipse/eclipse-collections">Eclipse
Collections</a> - Collections framework inspired by Smalltalk.</li>
<li><a href="http://fastutil.di.unimi.it">fastutil</a> - Fast and
compact type-specific collections.</li>
<li><a href="https://labs.carrotsearch.com/hppc.html">HPPC</a> -
Primitive collections.</li>
<li><a href="https://github.com/JCTools/JCTools">JCTools</a> -
Concurrency tools currently missing from the JDK.</li>
<li><a href="https://github.com/leventov/Koloboke">Koloboke</a> -
Carefully designed extension of the Java Collections Framework with
primitive specializations and more.</li>
</ul>
<h3 id="http-clients">HTTP Clients</h3>
<p><em>Libraries that assist with creating HTTP requests and/or binding
responses.</em></p>
<ul>
<li><a href="https://hc.apache.org/">Apache HttpComponents</a> - Toolset
of low-level Java components focused on HTTP and associated
protocols.</li>
<li><a href="https://github.com/AsyncHttpClient/async-http-client">Async
Http Client</a> - Asynchronous HTTP and WebSocket client library.</li>
<li><a href="https://avaje.io/http-client">Avaje Http Client</a> -
Wrapper on JDK 11’s HttpClient that adds Feign-like interface among
other enhancements.</li>
<li><a href="https://github.com/OpenFeign/feign">Feign</a> - HTTP client
binder inspired by Retrofit, JAXRS-2.0, and WebSocket.</li>
<li><a
href="https://github.com/googleapis/google-http-java-client">Google HTTP
Client</a> - Pluggable HTTP transport abstraction with support for
java.net.HttpURLConnection, Apache HTTP Client, Android, Google App
Engine, XML, Gson, Jackson and Protobuf.</li>
<li><a href="https://github.com/mizosoft/methanol">methanol</a> - HTTP
client extensions library.</li>
<li><a href="https://square.github.io/retrofit/">Retrofit</a> - Typesafe
REST client.</li>
<li><a href="https://github.com/Netflix/ribbon">Ribbon</a> - Client-side
IPC library that is battle-tested in the cloud.</li>
<li><a href="https://github.com/zalando/riptide">Riptide</a> -
Client-side response routing for Spring’s RestTemplate.</li>
<li><a href="https://github.com/Kong/unirest-java">unirest-java</a> -
Simplified, lightweight HTTP client library.</li>
</ul>
<h3 id="hypermedia-types">Hypermedia Types</h3>
<p><em>Libraries that handle serialization to hypermedia types.</em></p>
<ul>
<li><a href="https://github.com/blackdoor/hate">hate</a> - Builds
hypermedia-friendly objects according to HAL specification.</li>
<li><a href="https://github.com/jsonld-java/jsonld-java">JSON-LD</a> -
JSON-LD implementation.</li>
<li><a href="https://github.com/eserating-chwy/siren4j">Siren4J</a> -
Library for the Siren specification.</li>
</ul>
<h3 id="ide">IDE</h3>
<p><em>Integrated development environments that try to simplify several
aspects of development.</em></p>
<ul>
<li><a href="https://www.eclipse.org">Eclipse</a> - Established
open-source project with support for lots of plugins and languages.</li>
<li><a href="https://www.jetbrains.com/idea/">IntelliJ IDEA <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Supports many JVM languages and provides good options
for Android development. The commercial edition targets the enterprise
sector.</li>
<li><a href="https://www.jgrasp.org">jGRASP</a> - Created to provide
software visualizations that work in conjunction with the debugger such
as Control Structure Diagrams, UML class diagrams and Object
Viewer.</li>
<li><a href="https://netbeans.apache.org">NetBeans</a> - Provides
integration for several Java SE and EE features, from database access to
HTML5.</li>
<li><a href="https://reportmill.com/SnapCode/">SnapCode</a> - Modern IDE
for Java running in the browser, focused on education.</li>
<li><a href="https://code.visualstudio.com/docs/languages/java">Visual
Studio Code</a> - Provides Java support for lightweight projects with a
simple, modern workflow by using extensions from the internal
marketplace.</li>
</ul>
<h3 id="imagery">Imagery</h3>
<p><em>Libraries that assist with the creation, evaluation or
manipulation of graphical images.</em></p>
<ul>
<li><a href="https://github.com/rkalla/imgscalr">Imgscalr</a> - Simple,
efficient and hardware-accelerated image-scaling library implemented in
pure Java 2D.</li>
<li><a href="https://github.com/nguyenq/tess4j">Tess4J</a> - JNA wrapper
for Tesseract OCR API.</li>
<li><a href="https://github.com/coobird/thumbnailator">Thumbnailator</a>
- High-quality thumbnail generation library.</li>
<li><a href="https://github.com/haraldk/TwelveMonkeys">TwelveMonkeys</a>
- Collection of plugins that extend the number of supported image file
formats.</li>
<li><a href="https://github.com/zxing/zxing">ZXing</a> - Multi-format
1D/2D barcode image processing library.</li>
<li><a
href="https://github.com/romankh3/image-comparison">image-comparison</a>
- Library that compares 2 images with the same sizes and shows the
differences visually by drawing rectangles. Some parts of the image can
be excluded from the comparison.</li>
</ul>
<h3 id="introspection">Introspection</h3>
<p><em>Libraries that help make the Java introspection and reflection
API easier and faster to use.</em></p>
<ul>
<li><a href="https://github.com/classgraph/classgraph">ClassGraph</a> -
ClassGraph (formerly FastClasspathScanner) is an uber-fast,
ultra-lightweight, parallelized classpath scanner and module scanner for
Java, Scala, Kotlin and other JVM languages.</li>
<li><a href="https://github.com/jOOQ/jOOR">jOOR</a> - jOOR stands for
jOOR Object Oriented Reflection. It is a simple wrapper for the
java.lang.reflect package.</li>
<li><a href="http://projetos.vidageek.net/mirror/mirror/">Mirror</a> -
Mirror was created to bring light to a simple problem, usually named
ReflectionUtil, which is on almost all projects that rely on reflection
to do advanced tasks.</li>
<li><a href="http://objenesis.org">Objenesis</a> - Allows dynamic
instantiation without default constructor, e.g. constructors which have
required arguments, side effects or throw exceptions.</li>
<li><a
href="https://github.com/EsotericSoftware/reflectasm">ReflectASM</a> -
ReflectASM is a very small Java library that provides high performance
reflection by using code generation.</li>
<li><a href="https://github.com/ronmamo/reflections">Reflections</a> -
Reflections scans your classpath, indexes the metadata, allows you to
query it on runtime and may save and collect that information for many
modules within your project.</li>
</ul>
<h3 id="job-scheduling">Job Scheduling</h3>
<p><em>Libraries for scheduling background jobs.</em></p>
<ul>
<li><a href="https://github.com/jobrunr/jobrunr">JobRunr</a> - Job
scheduling library which utilizes lambdas for fire-and-forget, delayed
and recurring jobs. Guarantees execution by single scheduler instance
using optimistic locking. Has features for persistence, minimal
dependencies and is embeddable.</li>
<li><a href="https://github.com/quartz-scheduler/quartz">Quartz</a> -
Feature-rich, open source job scheduling library that can be integrated
within virtually any Java application.</li>
<li><a href="https://github.com/knowm/Sundial">Sundial</a> - Lightweight
framework to simply define jobs, define triggers and start the
scheduler.</li>
<li><a href="https://github.com/Coreoz/Wisp">Wisp</a> - Simple library
with minimal footprint and straightforward API.</li>
<li><a
href="https://github.com/kagkarlsson/db-scheduler">db-scheduler</a> -
Persistent and cluster-friendly scheduler.</li>
<li><a href="https://github.com/j-easy/easy-batch">easy-batch</a> - Set
up batch jobs with simple processing pipelines. Records are read in
sequence from a data source, processed in pipeline and written in
batches to a data sink.</li>
<li><a href="https://github.com/lukas-krecan/ShedLock">shedlock</a> -
Makes sure that your scheduled tasks are executed at most once at the
same time. If a task is being executed on one node, it acquires a lock
which prevents execution of the same task from another node or
thread.</li>
</ul>
<h3 id="json">JSON</h3>
<p><em>Libraries for serializing and deserializing JSON to and from Java
objects.</em></p>
<ul>
<li><a href="https://avaje.io/jsonb/">Avaje Jsonb</a> - Reflection-free
Json binding via source code generation with Jackson-like
annotations.</li>
<li><a href="https://github.com/ngs-doo/dsl-json">DSL-JSON</a> - JSON
library with advanced compile time databinding.</li>
<li><a href="http://genson.io">Genson</a> - Powerful and easy-to-use
Java-to-JSON conversion library.</li>
<li><a href="https://github.com/google/gson">Gson</a> - Serializes
objects to JSON and vice versa. Good performance with on-the-fly
usage.</li>
<li><a
href="https://github.com/brettwooldridge/HikariJSON">HikariJSON</a> -
High-performance JSON parser, 2x faster than Jackson.</li>
<li><a
href="https://github.com/FasterXML/jackson-modules-java8">jackson-modules-java8</a>
- Set of Jackson modules for Java 8 datatypes and features.</li>
<li><a
href="https://github.com/zalando/jackson-datatype-money">Jackson-datatype-money</a>
- Open-source Jackson module to support JSON serialization and
deserialization of JavaMoney data types.</li>
<li><a href="https://github.com/FasterXML/jackson">Jackson</a> - Similar
to GSON, but offers performance gains if you need to instantiate the
library more often.</li>
<li><a href="https://github.com/jdereg/json-io">JSON-io</a> - Convert
Java to JSON. Convert JSON to Java. Pretty print JSON. Java JSON
serializer.</li>
<li><a href="http://jsoniter.com">jsoniter</a> - Fast and flexible
library with iterator and lazy parsing API.</li>
<li><a
href="https://github.com/bluelinelabs/LoganSquare">LoganSquare</a> -
JSON parsing and serializing library based on Jackson’s streaming API.
Outperforms GSON &amp; Jackson’s library.</li>
<li><a href="https://github.com/square/moshi">Moshi</a> - Modern JSON
library, less opinionated and uses built-in types like List and
Map.</li>
<li><a href="https://github.com/eclipse-ee4j/yasson">Yasson</a> -
Binding layer between classes and JSON documents similar to JAXB.</li>
<li><a href="https://github.com/alibaba/fastjson">fastjson</a> - Very
fast processor with no additional dependencies and full data
binding.</li>
<li><a href="https://github.com/bazaarvoice/jolt">Jolt</a> - JSON to
JSON transformation tool.</li>
<li><a href="https://github.com/json-path/JsonPath">JsonPath</a> -
Extract data from JSON using XPATH-like syntax.</li>
<li><a href="https://github.com/jsurfer/JsonSurfer">JsonSurfer</a> -
Streaming JsonPath processor dedicated to processing big and complicated
JSON data.</li>
</ul>
<h3 id="jvm-and-jdk">JVM and JDK</h3>
<p><em>Current implementations of the JVM/JDK.</em></p>
<ul>
<li><a href="https://adoptopenjdk.net">Adopt Open JDK</a> -
Community-driven OpenJDK builds, including both HotSpot and OpenJ9.</li>
<li><a href="https://github.com/ReadyTalk/avian">Avian</a> - JVM with
JIT, AOT modes and iOS port.</li>
<li><a href="https://aws.amazon.com/corretto/">Corretto</a> - No-cost,
multiplatform, production-ready distribution of OpenJDK by Amazon.
(GPL-2.0-only WITH Classpath-exception-2.0)</li>
<li><a href="https://github.com/alibaba/dragonwell8">Dragonwell8</a> -
Downstream version of OpenJDK optimized for online e-commerce,
financial, logistics applications.</li>
<li><a href="https://github.com/oracle/graal">Graal</a> - Polyglot
embeddable JVM. (GPL-2.0-only WITH Classpath-exception-2.0)</li>
<li><a href="https://bell-sw.com">Liberica JDK</a> - Built from OpenJDK,
thoroughly tested and passed the JCK. (GPL-2.0-only WITH
Classpath-exception-2.0)</li>
<li><a href="https://github.com/eclipse/openj9">OpenJ9</a> - High
performance, enterprise-calibre, flexibly licensed, openly-governed
cross-platform JVM extending and augmenting the runtime technology
components from the Eclipse OMR and OpenJDK project.</li>
<li><a href="https://openjdk.java.net">Open JDK</a> - Open JDK community
home. (GPL-2.0-only WITH Classpath-exception-2.0)</li>
<li><a
href="https://github.com/codenameone/CodenameOne/tree/master/vm">ParparVM</a>
- VM with non-blocking, concurrent GC for iOS. (GPL-2.0-only WITH
Classpath-exception-2.0)</li>
<li><a
href="https://developers.redhat.com/products/openjdk/overview">RedHat
Open JDK</a> - RedHat’s OpenJDK distribution. (GPL-2.0-only WITH
Classpath-exception-2.0)</li>
<li><a href="https://sap.github.io/SapMachine/">SAP Machine</a> - SAP’s
no-cost, rigorously tested and JCK-verified OpenJDK friendly fork.
(GPL-2.0-only WITH Classpath-exception-2.0)</li>
<li><a href="https://www.azul.com/products/zulu-community/">Zulu</a> -
OpenJDK builds for Windows, Linux, and macOS. (GPL-2.0-only WITH
Classpath-exception-2.0)</li>
<li><a href="https://github.com/microsoft/openjdk">Microsoft JDK</a> -
Microsoft Build of OpenJDK, Free, Open Source, Freshly Brewed!</li>
</ul>
<h3 id="logging">Logging</h3>
<p><em>Libraries that log the behavior of an application.</em></p>
<ul>
<li><a href="https://logging.apache.org/log4j/">Apache Log4j 2</a> -
Complete rewrite with a powerful plugin and configuration
architecture.</li>
<li><a href="https://github.com/tersesystems/echopraxia">Echopraxia</a>
- API designed around structured logging, rich context, and conditional
logging. There are Logback and Log4J2 implementations, but Echopraxia’s
API is completely dependency-free, meaning it can be implemented with
any logging API.</li>
<li><a href="https://www.graylog.org">Graylog</a> - Open-source
aggregator suited for extended role and permission management.
(GPL-3.0-only)</li>
<li><a href="https://www.elastic.co/kibana">Kibana</a> - Analyzes and
visualizes log files. Some features require payment.</li>
<li><a href="http://logback.qos.ch">Logback</a> - Robust logging library
with interesting configuration options via Groovy.</li>
<li><a href="https://github.com/zalando/logbook">Logbook</a> -
Extensible, open-source library for HTTP request and response
logging.</li>
<li><a href="https://www.elastic.co/logstash">Logstash</a> - Tool for
managing log files.</li>
<li><a href="https://github.com/p6spy/p6spy">p6spy</a> - Enables logging
for all JDBC transactions without changes to the code.</li>
<li><a href="http://www.slf4j.org">SLF4J</a> - Abstraction layer/simple
logging facade.</li>
<li><a href="https://tinylog.org/v2/">tinylog</a> - Lightweight logging
framework with static logger class.</li>
<li><a href="https://github.com/zalando/opentracing-toolbox">OpenTracing
Toolbox</a> - Collection of libraries that build on top of OpenTracing
and provide extensions and plugins to existing instrumentations.</li>
</ul>
<h3 id="machine-learning">Machine Learning</h3>
<p><em>Tools that provide specific statistical algorithms for learning
from data.</em></p>
<ul>
<li><a href="https://flink.apache.org">Apache Flink</a> - Fast,
reliable, large-scale data processing engine.</li>
<li><a href="https://mahout.apache.org">Apache Mahout</a> - Scalable
algorithms focused on collaborative filtering, clustering and
classification.</li>
<li><a href="http://www.datumbox.com">DatumBox</a> - Provides several
algorithms and pre-trained models for natural language processing.</li>
<li><a href="https://deeplearning4j.org">Deeplearning4j</a> -
Distributed and multi-threaded deep learning library.</li>
<li><a href="https://djl.ai">DJL</a> - High-level and engine-agnostic
framework for deep learning.</li>
<li><a href="https://www.h2o.ai">H2O <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Analytics engine for statistics over big data.</li>
<li><a href="https://github.com/Barqawiz/IntelliJava">Intelligent
java</a> - Seamlessly integrate with remote deep learning and language
models programmatically.</li>
<li><a href="https://github.com/EdwardRaff/JSAT">JSAT</a> - Algorithms
for pre-processing, classification, regression, and clustering with
support for multi-threaded execution. (GPL-3.0-only)</li>
<li><a href="https://github.com/BayesWitnesses/m2cgen">m2cgen</a> - CLI
tool to transpile models into native code.</li>
<li><a href="https://github.com/Gleethos/neureka">Neureka</a> - A
lightweight, platform independent, OpenCL accelerated nd-array/tensor
library.</li>
<li><a href="https://www.ojalgo.org/">oj! Algorithms</a> -
High-performance mathematics, linear algebra and optimisation needed for
data science, machine learning and scientific computing.</li>
<li><a href="https://github.com/OryxProject/oryx">Oryx 2</a> - Framework
for building real-time, large-scale machine learning applications.
Includes end-to-end applications for collaborative filtering,
classification, regression, and clustering.</li>
<li><a href="https://github.com/siddhi-io/siddhi">Siddhi</a> - Cloud
native streaming and complex event processing engine.</li>
<li><a href="https://github.com/haifengl/smile">Smile</a> - Statistical
Machine Intelligence and Learning Engine provides a set of machine
learning algorithms and a visualization library.</li>
<li><a href="https://tribuo.org/">Tribuo</a> - Provides tools for
classification, regression, clustering, model development and interfaces
with other libraries such as scikit-learn, pytorch and TensorFlow.</li>
<li><a href="https://www.cs.waikato.ac.nz/ml/weka/">Weka</a> -
Collection of algorithms for data mining tasks ranging from
pre-processing to visualization. (GPL-3.0-only)</li>
</ul>
<h3 id="messaging">Messaging</h3>
<p><em>Tools that help send messages between clients to ensure protocol
independency.</em></p>
<ul>
<li><a href="https://github.com/real-logic/Aeron">Aeron</a> - Efficient,
reliable, unicast and multicast message transport.</li>
<li><a href="https://activemq.apache.org">Apache ActiveMQ</a> - Message
broker that implements JMS and converts synchronous to asynchronous
communication.</li>
<li><a href="https://camel.apache.org">Apache Camel</a> - Glues together
different transport APIs via Enterprise Integration Patterns.</li>
<li><a href="https://kafka.apache.org">Apache Kafka</a> -
High-throughput distributed messaging system.</li>
<li><a href="https://pulsar.apache.org">Apache Pulsar</a> - Distributed
pub/sub-messaging system.</li>
<li><a href="https://rocketmq.apache.org">Apache RocketMQ</a> - Fast,
reliable, and scalable distributed messaging platform.</li>
<li><a href="https://qpid.apache.org">Apache Qpid</a> - Apache Qpid
makes messaging tools that speak AMQP and support many languages and
platforms.</li>
<li><a href="https://github.com/AutoMQ/automq-for-kafka">AutoMQ</a> -
AutoMQ is a cloud-native, serverless reinvented Kafka that is easily
scalable, manage-less and cost-effective.</li>
<li><a href="https://github.com/joel-jeremy/deezpatch">Deezpatch</a> -
Simple, lightweight, and performant dispatch library for decoupling
messages (requests and events) and message handlers.</li>
<li><a href="https://github.com/greenrobot/EventBus">EventBus</a> -
Simple publish/subscribe event bus.</li>
<li><a href="http://hermes.allegro.tech">Hermes</a> - Fast and reliable
message broker built on top of Kafka.</li>
<li><a href="https://github.com/zeromq/jeromq">JeroMQ</a> -
Implementation of ZeroMQ.</li>
<li><a href="https://github.com/zalando/nakadi">Nakadi</a> - Provides a
RESTful API on top of Kafka.</li>
<li><a href="https://github.com/rabbitmq/rabbitmq-java-client">RabbitMQ
Java client</a> - RabbitMQ client.</li>
<li><a href="https://github.com/igniterealtime/Smack">Smack</a> -
Cross-platform XMPP client library.</li>
<li><a href="https://github.com/nats-io/nats.java">NATS client</a> -
NATS client.</li>
</ul>
<h3 id="microservice">Microservice</h3>
<p><em>Tools for creating and managing microservices.</em></p>
<ul>
<li><a href="https://rpc.activej.io">ActiveRPC</a> - Lightweight and
fast library for complex high-load distributed applications and
Memcached-like solutions.</li>
<li><a href="https://spotify.github.io/apollo/">Apollo</a> - Libraries
for writing composable microservices.</li>
<li><a href="https://github.com/line/armeria">Armeria</a> - Asynchronous
RPC/REST client/server library built on top of Java 8, Netty, HTTP/2,
Thrift and gRPC.</li>
<li><a href="https://github.com/Ecwid/consul-api">consul-api</a> -
Client for the Consul API: a distributed, highly available and
datacenter-aware registry/discovery service.</li>
<li><a href="https://github.com/Netflix/eureka">Eureka</a> - REST-based
service registry for resilient load balancing and failover.</li>
<li><a href="https://helidon.io">Helidon</a> - Two-style approach for
writing microservices: Functional-reactive and as an implementation of
MicroProfile.</li>
<li><a href="https://github.com/DV8FromTheWorld/JDA">JDA</a> - Wrapping
of the Discord REST API and its WebSocket events.</li>
<li><a href="https://github.com/DaveJarvis/KeenType">KeenType</a> -
Modernized version of a Java-based implementation of the New Typesetting
System, which was heavily based on Donald E. Knuth’s original TeX.</li>
<li><a
href="https://github.com/fabric8io/kubernetes-client">kubernetes-client</a>
- Client provides access to the full Kubernetes &amp; OpenShift REST
APIs via a fluent DSL.</li>
<li><a href="https://micronaut.io">Micronaut</a> - Modern full-stack
framework with focus on modularity, minimal memory footprint and startup
time.</li>
<li><a href="https://nacos.io">Nacos</a> - Dynamic service discovery,
configuration and service management platform for building cloud native
applications.</li>
<li><a href="https://github.com/TheoKanning/openai-java">OpenAI-Java</a>
- Java libraries for using OpenAI’s GPT-3 API.</li>
<li><a href="https://quarkus.io">Quarkus</a> - Kubernetes stack tailored
for the HotSpot and Graal VM.</li>
<li><a href="https://github.com/alibaba/Sentinel">Sentinel</a> - Flow
control component enabling reliability, resilience and monitoring for
microservices.</li>
</ul>
<h3 id="miscellaneous">Miscellaneous</h3>
<p><em>Everything else.</em></p>
<ul>
<li><a href="https://github.com/aws/aws-sdk-java-v2">AWS SDK for Java
2.0</a> - Wrapper around AWS’ API.</li>
<li><a href="https://github.com/npgall/cqengine">CQEngine</a> -
Ultra-fast, SQL-like queries on Java collections.</li>
<li><a href="https://github.com/iluwatar/java-design-patterns">Design
Patterns</a> - Implementation and explanation of the most common design
patterns.</li>
<li><a href="https://github.com/ff4j/ff4j">FF4J</a> - Feature Flags for
Java.</li>
<li><a
href="https://github.com/EnterpriseQualityCoding/FizzBuzzEnterpriseEdition">FizzBuzz
Enterprise Edition</a> - No-nonsense implementation of FizzBuzz made by
serious businessmen for serious business purposes. (No explicit
license)</li>
<li><a
href="https://github.com/ip2location/ip2location-io-java">IP2Location.io
Java SDK</a> - Wrapper for the IP2Location.io Geolocation API and the
IP2WHOIS domain WHOIS API.</li>
<li><a href="https://github.com/google/j2objc">J2ObjC</a> -
Java-to-Objective-C translator for porting Android libraries to
iOS.</li>
<li><a href="https://jbake.org">JBake</a> - Static website
generator.</li>
<li><a href="https://github.com/rampatra/jbot">JBot</a> - Framework for
building chatbots. (GPL-3.0-only)</li>
<li><a href="http://jcuda.org">JCuda</a> - JCuda offers Java bindings
for CUDA and CUDA-related libraries.</li>
<li><a href="https://github.com/google/jimfs">Jimfs</a> - In-memory file
system.</li>
<li><a
href="https://www.pelock.com/products/jobfuscator">JObfuscator<img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Source code obfuscator.</li>
<li><a href="https://www.joda.org/joda-money/">Joda-Money</a> - Basic
currency and money classes and algorithms not provided by the JDK.</li>
<li><a href="https://github.com/jooq/joox">jOOX</a> - Simple wrapper for
the org.w3c.dom package, to allow for fluent XML document creation and
manipulation with an API inspired by jQuery.</li>
<li><a href="http://jpad.io">JPad</a> - Snippet runner.</li>
<li><a href="https://github.com/cincheo/jsweet">jsweet</a> - Source
transpiler to TypeScript/JavaScript.</li>
<li><a href="https://github.com/takari/maven-wrapper">Maven Wrapper</a>
- Analogue of Gradle Wrapper for Maven, allows building projects without
installing maven.</li>
<li><a href="https://github.com/membrane/service-proxy">Membrane Service
Proxy</a> - Open-source, reverse-proxy framework.</li>
<li><a href="https://github.com/Guichaguri/MinimalFTP">MinimalFTP</a> -
Lightweight, small and customizable FTP server.</li>
<li><a href="https://github.com/adamfisk/LittleProxy">LittleProxy</a> -
High performance HTTP proxy atop Netty’s event-based networking
library.</li>
<li><a href="https://github.com/winterbe/java8-tutorial">Modern Java - A
Guide to Java 8</a> - Popular Java 8 guide.</li>
<li><a
href="https://github.com/gaul/modernizer-maven-plugin">Modernizer</a> -
Detect uses of legacy Java APIs.</li>
<li><a href="https://github.com/OctoLinker/OctoLinker">OctoLinker</a> -
Browser extension which allows to navigate through code on GitHub more
efficiently.</li>
<li><a href="http://openrefine.org">OpenRefine</a> - Tool for working
with messy data: cleaning, transforming, extending it with web services
and linking it to databases.</li>
<li><a href="https://github.com/sizovs/pipelinr">PipelinR</a> - Small
utility library for using handlers and commands with pipelines.</li>
<li><a href="https://github.com/takari/polyglot-maven">Polyglot for
Maven</a> - Extensions for Maven 3.3.1+ that allows writing the POM
model in dialects other than XML.</li>
<li><a href="https://github.com/Kartikvk1996/RR4J">RR4J</a> - RR4J is a
tool that records java bytecode execution and later allows developers to
replay locally.</li>
<li><a href="https://github.com/bbottema/simple-java-mail">Simple Java
Mail</a> - Mailing with a clean and fluent API.</li>
<li><a href="https://github.com/smooks/smooks">Smooks</a> - Framework
for fragment-based message processing. (Apache-2.0 OR
LGPL-3.0-or-later)</li>
<li><a
href="https://github.com/svix/svix-webhooks/tree/main/java">Svix</a> -
Library for the Svix API to send webhooks and verify signatures.</li>
<li><a href="https://www.togglz.org">Togglz</a> - Implementation of the
Feature Toggles pattern.</li>
<li><a href="https://github.com/jhalterman/typetools">TypeTools</a> -
Tools for resolving generic types.</li>
<li><a href="https://github.com/SvenEwald/xmlbeam">XMLBeam</a> -
Processes XML by using annotations or XPath within code.</li>
<li><a href="https://github.com/yWorks/yGuard">yGuard</a> - Obfuscation
via renaming and shrinking.</li>
</ul>
<h3 id="mobile-development">Mobile Development</h3>
<p><em>Tools for creating or managing mobile applications.</em></p>
<ul>
<li><a href="https://www.codenameone.com">Codename One</a> -
Cross-platform solution for writing native mobile apps. (GPL-2.0-only
WITH Classpath-exception-2.0)</li>
<li><a href="https://mobileui.dev">MobileUI</a> - Cross-platform
framework for developing mobile apps with native UI in Java and
Kotlin.</li>
<li><a href="https://multi-os-engine.org">Multi-OS Engine</a> -
Open-source, cross-platform engine to develop native mobile (iOS,
Android, etc.) apps.</li>
</ul>
<h3 id="monitoring">Monitoring</h3>
<p><em>Tools that observe/monitor applications in production by
providing telemetry.</em></p>
<ul>
<li><a href="https://github.com/stevensouza/automon">Automon</a> -
Combines the power of AOP with monitoring and/or logging tools.</li>
<li><a href="https://github.com/DataDog/dd-trace-java">Datadog <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Modern monitoring &amp; analytics.</li>
<li><a href="https://github.com/dropwizard/metrics">Dropwizard
Metrics</a> - Expose metrics via JMX or HTTP and send them to a
database.</li>
<li><a href="https://github.com/zalando/failsafe-actuator">Failsafe
Actuator</a> - Out of the box monitoring of Failsafe Circuit Breaker in
Spring-Boot environment.</li>
<li><a href="https://glowroot.org">Glowroot</a> - Open-source Java
APM.</li>
<li><a href="https://github.com/dromara/hertzbeat">HertzBeat</a> -
Real-time monitoring system with custom-monitor and agentless.</li>
<li><a
href="https://github.com/opengoofy/hippo4j/blob/develop/README-EN.md">hippo4j</a>
- Dynamic and observable thread pool framework.</li>
<li><a href="https://www.inspectit.rocks">inspectIT</a> - Captures
detailed run-time information via hooks that can be changed on the fly.
It supports tracing over multiple systems via the OpenTracing API and
can correlate the data with end user monitoring.</li>
<li><a href="https://instrumentalapp.com">Instrumental <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Real-time Java application performance monitoring. A
commercial service with free development accounts.</li>
<li><a href="https://github.com/jaegertracing/jaeger-client-java">Jaeger
client</a> - Jaeger client.</li>
<li><a href="https://github.com/javamelody/javamelody">JavaMelody</a> -
Performance monitoring and profiling.</li>
<li><a href="https://github.com/jmxtrans/jmxtrans">jmxtrans</a> -
Connect to multiple JVMs and query them for their attributes via JMX.
Its query language is based on JSON, which allows non-Java programmers
to access the JVM attributes. Supports different output writes,
including Graphite, Ganglia, and StatsD.</li>
<li><a href="https://jolokia.org">Jolokia</a> - JMX over REST.</li>
<li><a
href="https://github.com/micrometer-metrics/micrometer">Micrometer</a> -
Vendor-neutral metrics/observability facade for the most popular
metrics/observability libraries.</li>
<li><a href="https://github.com/micrometer-metrics/tracing">Micrometer
Tracing</a> - Vendor-neutral distributed tracing facade for the most
popular tracer libraries.</li>
<li><a href="https://github.com/lorenzoongithub/nudge4j">nudge4j</a> -
Remote developer console from the browser for Java 8 via bytecode
injection.</li>
<li><a href="https://github.com/naver/pinpoint">Pinpoint</a> -
Open-source APM tool.</li>
<li><a href="https://github.com/prometheus/client_java">Prometheus</a> -
Provides a multi-dimensional data model, DSL, autonomous server nodes
and much more.</li>
<li><a href="https://github.com/getsentry/sentry-java">Sentry <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Integration with <a
href="https://github.com/getsentry/sentry">Sentry</a>, an application
error tracking and performance analysis platform.</li>
<li><a href="https://github.com/sematext/sematext-agent-java">SPM <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Performance monitor with distributing transaction
tracing for JVM apps.</li>
<li><a
href="https://github.com/stagemonitor/stagemonitor">Stagemonitor</a> -
Open-source performance monitoring and transaction tracing for JVM
apps.</li>
<li><a href="https://github.com/palantir/Sysmon">Sysmon</a> -
Lightweight platform monitoring tool for Java VMs.</li>
<li><a href="https://zipkin.io">zipkin</a> - Distributed tracing system
which gathers timing data needed to troubleshoot latency problems in
microservice architectures.</li>
</ul>
<h3 id="native">Native</h3>
<p><em>For working with platform-specific native libraries.</em></p>
<ul>
<li><a href="https://github.com/Syncleus/aparapi">Aparapi</a> - Converts
bytecode to OpenCL which allows execution on GPUs.</li>
<li><a href="https://github.com/bytedeco/javacpp">JavaCPP</a> - Provides
efficient and easy access to native C++.</li>
<li><a href="https://github.com/java-native-access/jna">JNA</a> - Work
with native libraries without writing JNI. Also provides interfaces to
common system libraries.</li>
<li><a href="https://github.com/jnr/jnr-ffi">JNR</a> - Work with native
libraries without writing JNI. Also provides interfaces to common system
libraries. Same goals as JNA, but faster, and serves as the basis for
the upcoming <a href="http://openjdk.java.net/projects/panama">Project
Panama</a>.</li>
</ul>
<h3 id="natural-language-processing">Natural Language Processing</h3>
<p><em>Libraries that specialize in processing text.</em></p>
<ul>
<li><a href="https://github.com/CogComp/cogcomp-nlp">CogCompNLP</a> -
Provides common annotators for plain text input. (Research and Academic
Use License)</li>
<li><a
href="https://nlp.stanford.edu/software/corenlp.shtml">CoreNLP</a> -
Provides a set of fundamental tools for tasks like tagging, named entity
recognition, and sentiment analysis. (GPL-3.0-or-later)</li>
<li><a href="https://dkpro.github.io">DKPro</a> - Collection of reusable
NLP tools for linguistic pre-processing, machine learning, lexical
resources, etc.</li>
<li><a href="http://alias-i.com/lingpipe/">LingPipe</a> - Toolkit for
tasks ranging from POS tagging to sentiment analysis.</li>
</ul>
<h3 id="networking">Networking</h3>
<p><em>Libraries for building network servers.</em></p>
<ul>
<li><a
href="https://github.com/CiscoSE/commons-networking">Commons-networking</a>
- Client for server-sent events (SSE).</li>
<li><a href="https://github.com/puniverse/comsat">Comsat</a> -
Integrates standard Java web-related APIs with Quasar fibers and
actors.</li>
<li><a href="https://github.com/apache/dubbo">Dubbo</a> -
High-performance RPC framework.</li>
<li><a href="https://javaee.github.io/grizzly/">Grizzly</a> - NIO
framework. Used as a network layer in Glassfish.</li>
<li><a href="https://github.com/grpc/grpc-java">gRPC</a> - RPC framework
based on protobuf and HTTP/2.</li>
<li><a href="https://github.com/EsotericSoftware/kryonet">KryoNet</a> -
Provides a clean and simple API for efficient TCP and UDP client/server
network communication using NIO and Kryo.</li>
<li><a href="https://mina.apache.org">MINA</a> - Abstract, event-driven
async I/O API for network operations over TCP/IP and UDP/IP via Java
NIO.</li>
<li><a href="https://netty.io">Netty</a> - Framework for building
high-performance network applications.</li>
<li><a href="https://github.com/airlift/drift">Drift</a> - Easy-to-use,
annotation-based library for creating Thrift clients and serializable
types.</li>
<li><a href="https://github.com/apple/servicetalk">ServiceTalk</a> -
Framework built on Netty with APIs tailored to specific protocols and
support for multiple programming paradigms.</li>
<li><a href="https://github.com/hierynomus/sshj">sshj</a> -
Programmatically use SSH, SCP or SFTP.</li>
<li><a href="https://github.com/marianobarrios/tls-channel">TLS
Channel</a> - Implements a ByteChannel interface over SSLEngine,
enabling easy-to-use (socket-like) TLS.</li>
<li><a href="http://undertow.io">Undertow</a> - Web server providing
both blocking and non-blocking APIs based on NIO. Used as a network
layer in WildFly. (LGPL-2.1-only)</li>
<li><a href="https://github.com/slub/urnlib">urnlib</a> - Represent,
parse and encode URNs, as in RFC 2141. (GPL-3.0-only)</li>
<li><a href="https://github.com/komamitsu/fluency">Fluency</a> - High
throughput data ingestion logger to Fluentd and Fluent Bit.</li>
</ul>
<h3 id="orm">ORM</h3>
<p><em>APIs that handle the persistence of objects.</em></p>
<ul>
<li><a href="https://cayenne.apache.org">Apache Cayenne</a> - Provides a
clean, static API for data access. Also includes a GUI Modeler for
working with database mappings, and DB reverse engineering and
generation.</li>
<li><a href="https://github.com/domaframework/doma">Doma</a> - Database
access framework that verifies and generates source code at compile time
using annotation processing as well as native SQL templates called
two-way SQL.</li>
<li><a href="https://ebean.io">Ebean</a> - Provides simple and fast data
access.</li>
<li><a href="https://www.eclipse.org/eclipselink/">EclipseLink</a> -
Supports a number of persistence standards: JPA, JAXB, JCA and SDO.</li>
<li><a href="http://hibernate.org/orm/">Hibernate</a> - Robust and
widely used, with an active community. (LGPL-2.1-only)</li>
<li><a href="https://github.com/mybatis/mybatis-3">MyBatis</a> - Couples
objects with stored procedures or SQL statements.</li>
<li><a href="https://github.com/braisdom/ObjectiveSql">ObjectiveSql</a>
- ActiveRecord ORM for rapid development and convention over
configuration.</li>
<li><a href="https://github.com/permazen/permazen">Permazen</a> -
Language-natural persistence layer.</li>
<li><a
href="https://github.com/arnaudroger/SimpleFlatMapper">SimpleFlatMapper</a>
- Simple database and CSV mapper.</li>
</ul>
<h3 id="paas">PaaS</h3>
<p><em>Java platform as a service.</em></p>
<ul>
<li><a href="https://aws.amazon.com/elasticbeanstalk/">AWS Elastic
Beanstalk <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - AWS-based, with support for Tomcat and Jetty.</li>
<li><a href="https://aws.amazon.com/lambda/">AWS Lambda <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Serverless computation.</li>
<li><a href="https://cloud.google.com">Google Cloud <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Google’s cloud infrastructure.</li>
<li><a href="https://www.heroku.com">Heroku <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Abstract computing environments.</li>
<li><a href="https://azure.microsoft.com/en-us/">Microsoft Azure <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Microsoft’s cloud infrastructure.</li>
<li><a href="https://www.openshift.com">OpenShift <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Provides additionally an on-premise solution.</li>
</ul>
<h3 id="pdf">PDF</h3>
<p><em>Tools to help with PDF files.</em></p>
<ul>
<li><a href="https://xmlgraphics.apache.org/fop/">Apache FOP</a> -
Creates PDFs from XSL-FO.</li>
<li><a href="https://pdfbox.apache.org">Apache PDFBox</a> - Toolbox for
creating and manipulating PDFs.</li>
<li><a href="https://intive-fdv.github.io/DynamicJasper/">Dynamic
Jasper</a> - Abstraction layer to JasperReports. (LGPL-3.0-only)</li>
<li><a
href="https://github.com/dynamicreports/dynamicreports">DynamicReports</a>
- Simplifies JasperReports. (LGPL-3.0-only)</li>
<li><a href="https://www.eclipse.org/birt">Eclipse BIRT</a> - Report
engine for creating PDF and other formats (DOCX, XLSX, HTML, etc) using
Eclipse-based visual editor.</li>
<li><a
href="https://github.com/flyingsaucerproject/flyingsaucer">flyingsaucer</a>
- XML/XHTML and CSS 2.1 renderer. (LGPL-2.1-or-later)</li>
<li><a href="https://itextpdf.com/en">iText <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Creates PDF files programmatically.</li>
<li><a
href="https://community.jaspersoft.com/project/jasperreports-library">JasperReports</a>
- Complex reporting engine. (LGPL-3.0-only)</li>
<li><a href="https://github.com/danfickle/openhtmltopdf">Open HTML to
PDF</a> - Properly supports modern PDF standards based on flyingsaucer
and Apache PDFBox.</li>
<li><a href="https://github.com/LibrePDF/OpenPDF">OpenPDF</a> -
Open-source iText fork. (LGPL-3.0-only &amp; MPL-2.0)</li>
<li><a href="https://github.com/tabulapdf/tabula-java">Tabula</a> -
Extracts tables from PDF files.</li>
</ul>
<h3 id="performance-analysis">Performance analysis</h3>
<p><em>Tools for performance analysis, profiling and
benchmarking.</em></p>
<ul>
<li><a href="https://fastthread.io">fastThread <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Analyze and visualize thread dumps with a free
cloud-based upload interface.</li>
<li><a href="https://gceasy.io">GCeasy <img
src="https://cdn.rawgit.com/akullpp/23246ca832bda82bb505230bf3538e2a/raw/d9bcdb769bf025292f9c6bc1290f01f1fcd1f864/commercial.svg"
alt="c" /></a> - Tool to analyze and visualize GC logs. It provides a
free cloud-based upload interface.</li>
<li><a
href="https://github.com/jvm-profiling-tools/honest-profiler">honest-profiler</a>
- Low-overhead, bias-free sampling profiler.</li>
<li><a href="https://github.com/giltene/jHiccup">jHiccup</a> - Logs and
records platform JVM stalls.</li>
<li><a href="https://github.com/AdoptOpenJDK/jitwatch">JITWatch</a> -
Analyze the JIT compiler optimisations made by the HotSpot JVM.</li>
<li><a href="http://openjdk.java.net/projects/code-tools/jmh/">JMH</a> -
Harness for building, running, and analysing nano/micro/milli/macro
benchmarks written in Java and other languages targeting the JVM.
(GPL-2.0 only WITH Classpath-exception-2.0)</li>
<li><a
href="https://github.com/LatencyUtils/LatencyUtils">LatencyUtils</a> -
Utilities for latency measurement and reporting.</li>
</ul>
<h3 id="platform">Platform</h3>
<p><em>Frameworks that are suites of multiple libraries encompassing
several categories.</em></p>
<h4 id="apache-commons">Apache Commons</h4>
<ul>
<li><a href="http://commons.apache.org/proper/commons-bcel/">BCEL</a> -
Byte Code Engineering Library - analyze, create, and manipulate Java
class files.</li>
<li><a
href="http://commons.apache.org/proper/commons-beanutils/">BeanUtils</a>
- Easy-to-use wrappers around the Java reflection and introspection
APIs.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-beanutils2/">BeanUtils2</a>
- Redesign of Commons BeanUtils.</li>
<li><a href="http://commons.apache.org/proper/commons-bsf/">BSF</a> -
Bean Scripting Framework - interface to scripting languages, including
JSR-223.</li>
<li><a href="http://commons.apache.org/proper/commons-chain/">Chain</a>
- Chain of Responsibility pattern implementation.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-classscan/">ClassScan</a>
- Find Class interfaces, methods, fields, and annotations without
loading.</li>
<li><a href="http://commons.apache.org/proper/commons-cli/">CLI</a> -
Command-line arguments parser.</li>
<li><a href="http://commons.apache.org/sandbox/commons-cli2/">CLI2</a> -
Redesign of Commons CLI.</li>
<li><a href="http://commons.apache.org/proper/commons-codec/">Codec</a>
- General encoding/decoding algorithms, e.g. phonetic, base64 or
URL.</li>
<li><a
href="http://commons.apache.org/proper/commons-collections/">Collections</a>
- Extends or augments the Java Collections Framework.</li>
<li><a
href="http://commons.apache.org/proper/commons-compress/">Compress</a> -
Defines an API for working with tar, zip and bzip2 files.</li>
<li><a
href="http://commons.apache.org/proper/commons-configuration/">Configuration</a>
- Reading of configuration/preferences files in various formats.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-convert/">Convert</a> -
Commons-Convert aims to provide a single library dedicated to the task
of converting an object of one type to another.</li>
<li><a href="http://commons.apache.org/proper/commons-csv/">CSV</a> -
Component for reading and writing comma separated value files.</li>
<li><a
href="http://commons.apache.org/proper/commons-daemon/">Daemon</a> -
Alternative invocation mechanism for unix-daemon-like java code.</li>
<li><a href="http://commons.apache.org/proper/commons-dbcp/">DBCP</a> -
Database connection pooling services.</li>
<li><a
href="http://commons.apache.org/proper/commons-dbutils/">DbUtils</a> -
JDBC helper library.</li>
<li><a
href="http://commons.apache.org/proper/commons-digester/">Digester</a> -
XML-to-Java-object mapping utility.</li>
<li><a href="http://commons.apache.org/proper/commons-email/">Email</a>
- Library for sending e-mail from Java.</li>
<li><a href="http://commons.apache.org/proper/commons-exec/">Exec</a> -
API for dealing with external process execution and environment
management in Java.</li>
<li><a
href="http://commons.apache.org/proper/commons-fileupload/">FileUpload</a>
- File upload capability for your servlets and web applications.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-finder/">Finder</a> -
Java library inspired by the UNIX find command.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-flatfile/">Flatfile</a>
- Java library for working with flat data structures.</li>
<li><a
href="http://commons.apache.org/proper/commons-functor/">Functor</a> -
Function that can be manipulated as an object, or an object representing
a single, generic function.</li>
<li><a href="http://commons.apache.org/sandbox/commons-graph/">Graph</a>
- General purpose graph APIs and algorithms.</li>
<li><a href="http://commons.apache.org/sandbox/commons-i18n/">I18n</a> -
Adds the feature of localized message bundles that consist of one or
many localized texts that belong together.</li>
<li><a href="http://commons.apache.org/sandbox/commons-id/">Id</a> - Id
is a component used to generate identifiers.</li>
<li><a
href="http://commons.apache.org/proper/commons-imaging/">Imaging</a> -
Image library.</li>
<li><a href="http://commons.apache.org/proper/commons-io/">IO</a> -
Collection of I/O utilities.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-javaflow/">Javaflow</a>
- Continuation implementation to capture the state of the
application.</li>
<li><a href="http://commons.apache.org/proper/commons-jci/">JCI</a> -
Java Compiler Interface.</li>
<li><a href="http://commons.apache.org/proper/commons-jcs/">JCS</a> -
Java Caching System.</li>
<li><a href="http://commons.apache.org/proper/commons-jelly/">Jelly</a>
- XML based scripting and processing engine.</li>
<li><a href="http://commons.apache.org/proper/commons-jexl/">Jexl</a> -
Expression language which extends the Expression Language of the
JSTL.</li>
<li><a href="http://commons.apache.org/sandbox/commons-jnet/">JNet</a> -
JNet allows to use dynamically register url stream handlers through the
java.net API.</li>
<li><a
href="http://commons.apache.org/proper/commons-jxpath/">JXPath</a> -
Utilities for manipulating Java Beans using the XPath syntax.</li>
<li><a href="http://commons.apache.org/proper/commons-lang/">Lang</a> -
Provides extra functionality for classes in java.lang.</li>
<li><a
href="https://commons.apache.org/proper/commons-logging/">Logging</a> -
Wrapper around a variety of logging API implementations.</li>
<li><a href="http://commons.apache.org/proper/commons-math/">Math</a> -
Lightweight, self-contained mathematics and statistics components.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-monitoring/">Monitoring</a>
- Monitoring aims to provide a simple but extensible monitoring solution
for Java applications.</li>
<li><a href="http://commons.apache.org/sandbox/commons-nabla/">Nabla</a>
- Nabla provides automatic differentiation classes that can generate
derivative of any function implemented in the Java language.</li>
<li><a href="http://commons.apache.org/proper/commons-net/">Net</a> -
Collection of network utilities and protocol implementations.</li>
<li><a href="http://commons.apache.org/proper/commons-ognl/">OGNL</a> -
Object-graph navigation language.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-openpgp/">OpenPGP</a> -
Interface to signing and verifying data using OpenPGP.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-performance/">Performance</a>
- Small framework for microbenchmark clients, with implementations for
Commons DBCP and Pool.</li>
<li><a
href="http://commons.apache.org/sandbox/commons-pipeline/">Pipeline</a>
- Provides a set of pipeline utilities designed around work queues that
run in parallel to sequentially process data objects.</li>
<li><a href="http://commons.apache.org/proper/commons-pool/">Pool</a> -
Generic object pooling component.</li>
<li><a href="http://commons.apache.org/proper/commons-proxy/">Proxy</a>
- Library for creating dynamic proxies.</li>
<li><a href="https://commons.apache.org/proper/commons-rdf/">RDF</a> -
Common implementation of RDF 1.1 that could be implemented by systems on
the JVM.</li>
<li><a href="https://commons.apache.org/proper/commons-rng/">RNG</a> -
Commons Rng provides implementations of pseudo-random numbers
generators.</li>
<li><a href="http://commons.apache.org/proper/commons-scxml/">SCXML</a>
- Implementation of the State Chart XML specification aimed at creating
and maintaining a Java SCXML engine.</li>
<li><a
href="http://commons.apache.org/proper/commons-validator/">Validator</a>
- Framework to define validators and validation rules in an xml
file.</li>
<li><a href="http://commons.apache.org/proper/commons-vfs/">VFS</a> -
Virtual File System component for treating files, FTP, SMB, ZIP and such
like as a single logical file system.</li>
<li><a
href="http://commons.apache.org/proper/commons-weaver/">Weaver</a> -
Provides an easy way to enhance (weave) compiled bytecode.</li>
</ul>
<h4 id="other">Other</h4>
<ul>
<li><a href="https://www.cuba-platform.com/">CUBA Platform</a> -
High-level framework for developing enterprise applications with a rich
web interface, based on Spring, EclipseLink and Vaadin.</li>
<li><a href="https://github.com/networknt/light-4j/">Light-4J</a> -
Fast, lightweight and productive microservices framework with built-in
<a href="https://github.com/networknt/light-oauth2/">security</a>.</li>
<li><a href="https://github.com/OrienteerBAP/Orienteer/">Orienteer</a> -
Open-source business application platform for rapid
configuration/development of CRM, ERP, LMS and other applications.</li>
<li><a href="https://spring.io/projects/">Spring</a> - Provides many
packages for dependency injection, aspect-oriented programming,
security, etc.</li>
</ul>
<h3 id="processes">Processes</h3>
<p><em>Libraries that help the management of operating system
processes.</em></p>
<ul>
<li><a
href="https://github.com/vorburger/ch.vorburger.exec">ch.vorburger.exec</a>
- Convenient API around Apache Commons Exec.</li>
<li><a href="https://github.com/zeroturnaround/zt-exec">zt-exec</a> -
Provides a unified API to Apache Commons Exec and ProcessBuilder.</li>
<li><a
href="https://github.com/zeroturnaround/zt-process-killer">zt-process-killer</a>
- Stops processes started from Java or the system processes via
PID.</li>
</ul>
<h3 id="reactive-libraries">Reactive libraries</h3>
<p><em>Libraries for developing reactive applications.</em></p>
<ul>
<li><a href="https://akka.io">Akka</a> - Toolkit and runtime for
building concurrent, distributed, fault-tolerant and event-driven
applications.</li>
<li><a
href="https://github.com/reactive-streams/reactive-streams-jvm">Reactive
Streams</a> - Provides a standard for asynchronous stream processing
with non-blocking backpressure.</li>
<li><a href="https://github.com/reactor/reactor-core">Reactor</a> -
Library for building reactive fast-data applications.</li>
<li><a href="https://github.com/ReactiveX/RxJava">RxJava</a> - Allows
for composing asynchronous and event-based programs using observable
sequences.</li>
<li><a href="https://vertx.io">vert.x</a> - Polyglot event-driven
application framework.</li>
</ul>
<h3 id="rest-frameworks">REST Frameworks</h3>
<p><em>Frameworks specifically for creating RESTful services.</em></p>
<ul>
<li><a href="https://github.com/dropwizard/dropwizard">Dropwizard</a> -
Opinionated framework for setting up modern web applications with Jetty,
Jackson, Jersey and Metrics.</li>
<li><a href="https://elide.io">Elide</a> - Opinionated framework for
JSON- or GraphQL-APIs based on a JPA data model.</li>
<li><a href="https://jersey.github.io">Jersey</a> - JAX-RS reference
implementation.</li>
<li><a href="https://github.com/aol/micro-server">Microserver</a> -
Convenient, extensible microservices plugin system for Spring &amp;
Spring Boot. With more than 30 plugins and growing, it supports both
micro-monolith and pure microservices styles.</li>
<li><a href="https://www.rapidoid.org">Rapidoid</a> - Simple, secure and
extremely fast framework consisting of an embedded HTTP server, GUI
components and dependency injection.</li>
<li><a href="https://github.com/linkedin/rest.li">rest.li</a> -
Framework for building robust, scalable RESTful architectures using
typesafe bindings and asynchronous, non-blocking IO with an end-to-end
developer workflow that promotes clean practices, uniform interface
design and consistent data modeling.</li>
<li><a href="https://resteasy.github.io">RESTEasy</a> - Fully certified
and portable implementation of the JAX-RS specification.</li>
<li><a href="https://github.com/RestExpress/RestExpress">RestExpress</a>
- Thin wrapper on the JBoss Netty HTTP stack that provides scaling and
performance.</li>
<li><a href="https://github.com/restlet/restlet-framework-java">Restlet
Framework</a> - Pioneering framework with powerful routing and filtering
capabilities, and a unified client and server API.</li>
<li><a href="http://sparkjava.com">Spark</a> - Sinatra inspired
framework.</li>
<li><a href="http://www.crnk.io">Crnk</a> - Implementation of the JSON
API specification to build resource-oriented REST endpoints with
sorting, filtering, paging, linking, object graphs, type-safety, bulk
updates, integrations and more.</li>
<li><a
href="https://github.com/springdoc/springdoc-openapi">springdoc-openapi</a>
- Automates the generation of API documentation using Spring Boot
projects.</li>
<li><a href="https://swagger.io">Swagger</a> - Standard,
language-agnostic interface to REST APIs.</li>
</ul>
<h3 id="science">Science</h3>
<p><em>Libraries for scientific computing, analysis and
visualization.</em></p>
<ul>
<li><a href="https://biojava.org/">BioJava</a> - Facilitates processing
biological data by providing algorithms, file format parsers, sequencing
and 3D visualization commonly used in bioinformatics.</li>
<li><a href="https://github.com/GSI-CS-CO/chart-fx">Chart-FX</a> -
Scientific charting library with focus on performance optimised
real-time data visualisation at 25 Hz update rates for large data
sets.</li>
<li><a href="https://datamelt.org/">DataMelt</a> - Environment for
scientific computation, data analysis and data visualization.
(GPL-3.0-or-later)</li>
<li><a href="https://github.com/Erdos-Graph-Framework/Erdos">Erdos</a> -
Modular, light and easy graph framework for theoretic algorithms.</li>
<li><a href="http://graphstream-project.org">GraphStream</a> - Library
for modeling and analyzing dynamic graphs.</li>
<li><a href="http://www.jfree.org/jfreechart/">JFreeChart</a> - 2D chart
library for Swing, JavaFX and server-side applications.
(LGPL-2.1-only)</li>
<li><a href="https://github.com/jgrapht/jgrapht">JGraphT</a> - Graph
library that provides mathematical graph-theory objects and
algorithms.</li>
<li><a href="https://github.com/jgraph/jgraphx">JGraphX</a> - Library
for visualizing (mainly Swing) and interacting with node-edge
graphs.</li>
<li><a href="https://github.com/logic-ng/LogicNG">LogicNG</a> - Library
for creating, manipulating and solving Boolean and Pseudo-Boolean
formulas.</li>
<li><a href="https://github.com/MinesJTK/jtk">Mines Java Toolkit</a> -
Library for geophysical scientific computation, visualization and
digital signal analysis.</li>
<li><a href="https://github.com/zavtech/morpheus-core">Morpheus</a> -
Provides a versatile two-dimensional memory efficient tabular data
structure called a DataFrame to enable efficient in-memory analytics for
scientific computing on the JVM.</li>
<li><a href="https://www.orekit.org/">Orekit</a> - A low level space
flight dynamics library providing basic elements (orbits, dates,
attitude, frames…) and various algorithms (conversions, propagations,
pointing…) to handle them.</li>
<li><a href="https://github.com/jfree/orson-charts">Orson-Charts</a> -
Generates a wide variety of 3D charts that can be displayed with Swing
and JavaFX or exported to PDF, SVG, PNG and JPEG. (GPL-3.0-only)</li>
<li><a href="https://github.com/jtablesaw/tablesaw">Tablesaw</a> -
Includes a data-frame, an embedded column store, and hundreds of methods
to transform, summarize, or filter data.</li>
<li><a href="https://github.com/knowm/XChart">XChart</a> - Light-weight
library for plotting data. Many customizable chart types are
available.</li>
</ul>
<h3 id="search">Search</h3>
<p><em>Engines that index documents for search and analysis.</em></p>
<ul>
<li><a href="https://lucene.apache.org">Apache Lucene</a> -
High-performance, full-featured, cross-platform, text search engine
library.</li>
<li><a href="https://lucene.apache.org/solr/">Apache Solr</a> -
Enterprise search engine optimized for high-volume traffic.</li>
<li><a href="https://www.elastic.co">Elasticsearch</a> - Distributed,
multitenant-capable, full-text search engine with a RESTful web
interface and schema-free JSON documents.</li>
<li><a href="https://github.com/haeungun/indexer4j">Indexer4j</a> -
Simple and light full text indexing and searching library.</li>
</ul>
<h3 id="security">Security</h3>
<p><em>Libraries that handle security, authentication, authorization or
session management.</em></p>
<ul>
<li><a href="https://shiro.apache.org">Apache Shiro</a> - Performs
authentication, authorization, cryptography and session management.</li>
<li><a href="https://www.bouncycastle.org/java.html">Bouncy Castle</a> -
All-purpose cryptographic library and JCA provider offering a wide range
of functions, from basic helpers to PGP/SMIME operations.</li>
<li><a
href="https://github.com/jeremylong/DependencyCheck">DependencyCheck</a>
- Detects publicly disclosed vulnerabilities contained within a
project’s dependencies.</li>
<li><a href="https://cryptomator.org">Cryptomator</a> - Multiplatform,
transparent, client-side encryption of files in the cloud.
(GPL-3.0-only)</li>
<li><a href="https://github.com/hdiv/hdiv">Hdiv</a> - Runtime
application that repels application security risks included in the OWASP
Top 10, including SQL injection, cross-site scripting, cross-site
request forgery, data tampering, and brute force attacks.</li>
<li><a href="https://github.com/jwtk/jjwt">jjwt</a> - JSON web token for
Java and Android.</li>
<li><a href="https://github.com/BastiaanJansen/jwt-java">jwt-java</a> -
Easily create and parse JSON Web Tokens and create customized JWT
validators using a fluent API.</li>
<li><a href="https://github.com/auth0/jwks-rsa-java">Jwks RSA</a> - JSON
Web Key Set parser.</li>
<li><a href="https://github.com/abstractj/kalium">Kalium</a> - Binding
for the Networking and Cryptography (NaCl) library.</li>
<li><a href="https://www.keycloak.org">Keycloak</a> - Integrated SSO and
IDM for browser apps and RESTful web services.</li>
<li><a href="https://github.com/square/keywhiz">Keywhiz</a> - System for
distributing and managing secrets.</li>
<li><a href="https://github.com/GoSimpleLLC/nbvcxz">Nbvcxz</a> -
Advanced password strength estimation.</li>
<li><a href="http://oaccframework.org">OACC</a> - Provides
permission-based authorization services.</li>
<li><a href="https://github.com/OpenIdentityPlatform/OpenAM">OpenAM</a>
- Access management solution that includes authentication, SSO,
authorization, federation, entitlements and web services security.</li>
<li><a href="https://github.com/BastiaanJansen/OTP-Java">OTP-Java</a> -
One-time password generator library according to RFC 4226 (HOTP) and RFC
6238 (TOTP).</li>
<li><a href="https://github.com/pac4j/pac4j">pac4j</a> - Security
engine.</li>
<li><a href="http://www.passay.org/">Passay</a> - Enforce password
policy by validating candidate passwords against a configurable rule
set.</li>
<li><a href="https://github.com/Password4j/password4j">Password4j</a> -
User-friendly cryptographic library that supports Argon2, Bcrypt,
Scrypt, PBKDF2 and various other cryptographic hash functions.</li>
<li><a
href="https://github.com/tersesystems/securitybuilder">SecurityBuilder</a>
- Fluent Builder API for JCA and JSSE classes and especially X.509
certificates.</li>
<li><a
href="https://github.com/Hakky54/sslcontext-kickstart">SSLContext-Kickstart</a>
- High-level SSL context builder for configuring HTTP clients with
SSL/TLS.</li>
<li><a href="https://github.com/cossacklabs/themis">Themis</a> -
Multi-platform high-level cryptographic library provides easy-to-use
encryption for protecting sensitive data: secure messaging with forward
secrecy, secure data storage (AES256GCM); suits for building end-to-end
encrypted applications.</li>
<li><a href="https://github.com/google/tink">Tink</a> - Provides a
simple and misuse-proof API for common cryptographic tasks.</li>
<li><a href="https://www.topaz.sh">Topaz</a> - Fine-grained
authorization for applications with support for RBAC, ABAC, and
ReBAC.</li>
</ul>
<h3 id="serialization">Serialization</h3>
<p><em>Libraries that handle serialization with high
efficiency.</em></p>
<ul>
<li><a href="https://github.com/google/flatbuffers">FlatBuffers</a> -
Memory-efficient serialization library that can access serialized data
without unpacking and parsing it.</li>
<li><a
href="https://github.com/RuedigerMoeller/fast-serialization">FST</a> -
JDK-compatible, high-performance object graph serialization.</li>
<li><a href="https://github.com/alipay/fury">Fury</a> - Blazing fast
object graph serialization framework powered by JIT and zero-copy.</li>
<li><a href="https://github.com/EsotericSoftware/kryo">Kryo</a> - Fast
and efficient object graph serialization framework.</li>
<li><a href="https://github.com/msgpack/msgpack-java">MessagePack</a> -
Efficient binary serialization format.</li>
<li><a href="https://github.com/marcospassos/java-php-serializer">PHP
Serializer</a> - Serializing objects in the PHP serialization
format.</li>
</ul>
<h3 id="server">Server</h3>
<p><em>Servers specifically used to deploy applications.</em></p>
<ul>
<li><a href="https://tomcat.apache.org">Apache Tomcat</a> - Robust,
all-round server for Servlet and JSP.</li>
<li><a href="https://tomee.apache.org">Apache TomEE</a> - Tomcat plus
Java EE.</li>
<li><a href="https://www.eclipse.org/jetty/">Jetty</a> - Provides a Web
server and javax.servlet container, plus support for HTTP/2, WebSocket,
OSGi, JMX, JNDI, JAAS and many other integrations.</li>
<li><a href="https://github.com/NanoHttpd/nanohttpd">nanohttpd</a> -
Tiny, easily embeddable HTTP server.</li>
<li><a href="https://www.wildfly.org">WildFly</a> - Formerly known as
JBoss and developed by Red Hat with extensive Java EE support.
(LGPL-2.1-only)</li>
</ul>
<h3 id="template-engine">Template Engine</h3>
<p><em>Tools that substitute expressions in a template.</em></p>
<ul>
<li><a href="https://freemarker.apache.org">Freemarker</a> - Library to
generate text output (HTML web pages, e-mails, configuration files,
source code, etc.) based on templates and changing data.</li>
<li><a
href="https://jknack.github.io/handlebars.java/">Handlebars.java</a> -
Logicless and semantic Mustache templates.</li>
<li><a href="https://github.com/neuland/jade4j">Jade4J</a> -
Implementation of Pug (formerly known as Jade).</li>
<li><a href="https://github.com/verhas/jamal">Jamal</a> - Extendable
template engine embedded into Maven/JavaDoc, supporting multiple
extensions (Groovy, Ruby, JavaScript, JShell, PlantUml) with support for
snippet handling.</li>
<li><a href="https://github.com/jstachio/jstachio">jstachio</a> -
Typesafe Mustache templating engine.</li>
<li><a href="https://github.com/casid/jte">jte</a> - Compiles to
classes, and uses an easy syntax, several features to make development
easier and provides fast execution and a small footprint.</li>
<li><a href="https://github.com/jtwig/jtwig">Jtwig</a> - Modular,
configurable and fully tested template engine.</li>
<li><a href="https://pebbletemplates.io">Pebble</a> - Inspired by Twig
and separates itself with its inheritance feature and its easy-to-read
syntax. It ships with built-in autoescaping for security and it includes
integrated support for internationalization.</li>
<li><a href="https://github.com/fizzed/rocker">Rocker</a> - Optimized,
memory efficient and speedy template engine producing statically typed,
plain objects.</li>
<li><a
href="https://github.com/antlr/stringtemplate4">StringTemplate</a> -
Template engine for generating source code, web pages, emails, or any
other formatted text output.</li>
<li><a href="https://www.thymeleaf.org">Thymeleaf</a> - Aims to be a
substitute for JSP and works for XML files.</li>
</ul>
<h3 id="testing">Testing</h3>
<p><em>Tools that test from model to the view.</em></p>
<h4 id="asynchronous">Asynchronous</h4>
<p><em>Tools that simplify testing asynchronous services.</em></p>
<ul>
<li><a href="https://github.com/awaitility/awaitility">Awaitility</a> -
DSL for synchronizing asynchronous operations.</li>
<li><a
href="https://github.com/jhalterman/concurrentunit">ConcurrentUnit</a> -
Toolkit for testing multi-threaded and asynchronous applications.</li>
<li><a
href="https://greenmail-mail-test.github.io/greenmail/">GreenMail</a> -
In-memory email server for integration testing. Supports SMTP, POP3 and
IMAP including SSL. (GPL-2.0-only)</li>
<li><a href="https://github.com/SpectoLabs/hoverfly-java">Hoverfly
Java</a> - Native bindings for Hoverfly, a proxy which allows you to
simulate HTTP services.</li>
<li><a href="https://github.com/intuit/karate">Karate</a> - DSL that
combines API test-automation, mocks and performance-testing making
testing REST/HTTP services easy.</li>
<li><a href="https://github.com/rest-assured/rest-assured">REST
Assured</a> - DSL for easy testing of REST/HTTP services.</li>
<li><a href="https://github.com/testingisdocumenting/webtau">WebTau</a>
- Test across REST-API, Graph QL, Browser, Database, CLI and Business
Logic with consistent set of matchers and concepts.</li>
</ul>
<h4 id="bdd">BDD</h4>
<p><em>Testing for the software development process that emerged from
TDD and was heavily influenced by DDD and OOAD.</em></p>
<ul>
<li><a href="https://github.com/cucumber/cucumber-jvm">Cucumber</a> -
Provides a way to describe features in a plain language which customers
can understand.</li>
<li><a href="https://github.com/ctco/cukes">Cukes-REST</a> - Collection
of Gherkin steps for REST-service testing using Cucumber.</li>
<li><a href="https://github.com/j8spec/j8spec">J8Spec</a> - Follows a
Jasmine-like syntax.</li>
<li><a href="https://jbehave.org">JBehave</a> - Extensively configurable
framework that describes stories.</li>
<li><a href="http://jgiven.org">JGiven</a> - Provides a fluent API which
allows for simpler composition.</li>
<li><a href="https://github.com/RichardWarburton/lambda-behave">Lamdba
Behave</a> - Aims to provide a fluent API to write tests in long and
descriptive sentences that read like plain English.</li>
<li><a href="https://github.com/serenity-bdd/serenity-core">Serenity
BDD</a> - Automated Acceptance testing and reporting library that works
with Cucumber, JBehave and JUnit to make it easier to write high quality
executable specifications.</li>
</ul>
<h4 id="fixtures">Fixtures</h4>
<p><em>Everything related to the creation and handling of random
data.</em></p>
<ul>
<li><a href="https://github.com/keepcosmos/beanmother">Beanmother</a> -
Sets up beans from YAML fixtures.</li>
<li><a href="https://github.com/datafaker-net/datafaker">Datafaker</a> -
Modern fake data generator forked from Java Faker.</li>
<li><a href="https://github.com/six2six/fixture-factory">Fixture
Factory</a> - Generates fake objects from a template.</li>
<li><a href="https://github.com/Devskiller/jfairy">jFairy</a> - Fake
data generator.</li>
<li><a href="https://github.com/instancio/instancio">Instancio</a> -
Automates data setup in unit tests by generating fully-populated,
reproducible objects. Includes JUnit 5 extension.</li>
<li><a
href="https://github.com/randomizedtesting/randomizedtesting">Randomized
Testing</a> - JUnit test runner and plugins for running JUnit tests with
pseudo-randomness.</li>
<li><a href="https://github.com/DiUS/java-faker">Java Faker</a> - Port
of Ruby’s fake data generator.</li>
<li><a href="https://github.com/nomemory/mockneat">Mockneat</a> -
Another fake data generator.</li>
</ul>
<h4 id="frameworks">Frameworks</h4>
<p><em>Provide environments to run tests for a specific use
case.</em></p>
<ul>
<li><a href="https://github.com/TNG/ArchUnit">ArchUnit</a> - Test
library for specifying and asserting architecture rules.</li>
<li><a href="http://jmeter.apache.org">Apache JMeter</a> - Functional
testing and performance measurements.</li>
<li><a href="http://arquillian.org">Arquillian</a> - Integration and
functional testing platform for Java EE containers.</li>
<li><a href="https://citrusframework.org">Citrus</a> - Integration
testing framework that focuses on both client- and server-side
messaging.</li>
<li><a href="https://gatling.io">Gatling</a> - Load testing tool
designed for ease of use, maintainability and high performance.</li>
<li><a href="https://junit.org/junit5/">JUnit</a> - Common testing
framework.</li>
<li><a href="https://jqwik.net">jqwik</a> - Engine for property-based
testing built on JUnit 5.</li>
<li><a href="https://github.com/DiUS/pact-jvm">Pact JVM</a> -
Consumer-driven contract testing.</li>
<li><a href="http://pitest.org">PIT</a> - Fast mutation-testing
framework for evaluating fault-detection abilities of existing JUnit or
TestNG test suites.</li>
</ul>
<h4 id="matchers">Matchers</h4>
<p><em>Libraries that provide custom matchers.</em></p>
<ul>
<li><a href="https://joel-costigliola.github.io/assertj/">AssertJ</a> -
Fluent assertions that improve readability.</li>
<li><a href="http://hamcrest.org/JavaHamcrest/">Hamcrest</a> - Matchers
that can be combined to create flexible expressions of intent.</li>
<li><a href="http://jsonassert.skyscreamer.org">JSONAssert</a> -
Simplifies testing JSON strings.</li>
<li><a href="https://github.com/lukas-krecan/JsonUnit">JsonUnit</a> -
Library that simplifies JSON comparison in tests.</li>
<li><a href="https://truth.dev">Truth</a> - Google’s fluent assertion
and proposition framework.</li>
<li><a href="https://github.com/xmlunit/xmlunit">XMLUnit</a> -
Simplifies testing for XML output.</li>
</ul>
<h4 id="miscellaneous-1">Miscellaneous</h4>
<p><em>Other stuff related to testing.</em></p>
<ul>
<li><a
href="https://github.com/Hakky54/console-captor">ConsoleCaptor</a> -
Captures console output for unit testing purposes.</li>
<li><a
href="https://github.com/TNG/junit-dataprovider">junit-dataprovider</a>
- TestNG-like data provider/runner for JUnit.</li>
<li><a href="https://github.com/Hakky54/log-captor">LogCaptor</a> -
Captures log entries for unit testing purposes.</li>
<li><a
href="https://github.com/dm-drogeriemarkt/log-capture">log-capture</a> -
Captures log entries and provides assertions for unit and integration
testing.</li>
<li><a
href="https://github.com/MutabilityDetector/MutabilityDetector">Mutability
Detector</a> - Reports whether instances of a given class are
immutable.</li>
<li><a href="https://www.pojo.pl">pojo-tester</a> - Automatically
performs tests on basic POJO methods. (LGPL-3.0-only)</li>
<li><a href="https://github.com/nidi3/raml-tester">raml-tester</a> -
Tests if a request/response matches a given RAML definition.</li>
<li><a href="https://github.com/diffplug/selfie">Selfie</a> - Snapshot
testing (inline and on disk).</li>
<li><a
href="https://github.com/testcontainers/testcontainers-java">TestContainers</a>
- Provides throwaway instances of common databases, Selenium web
browsers, or anything else that can run in a Docker container.</li>
</ul>
<h4 id="mocking">Mocking</h4>
<p><em>Tools which mock collaborators to help testing single, isolated
units.</em></p>
<ul>
<li><a href="http://jmockit.github.io">JMockit</a> - Integration
testing, API mocking and faking, and code coverage.</li>
<li><a href="https://github.com/mockito/mockito">Mockito</a> - Mocking
framework that lets you write tests with a clean and simple API.</li>
<li><a href="https://www.mock-server.com">MockServer</a> - Allows
mocking of systems integrated with HTTPS.</li>
<li><a href="https://github.com/dreamhead/moco">Moco</a> - Concise web
services for stubs and mocks.</li>
<li><a href="https://github.com/powermock/powermock">PowerMock</a> -
Mocks static methods, constructors, final classes and methods, private
methods, and removal of static initializers.</li>
<li><a href="http://wiremock.org">WireMock</a> - Stubs and mocks web
services.</li>
<li><a href="https://github.com/easymock/easymock">EasyMock</a> -
EasyMock is a Java library that provides an easy way to use Mock Objects
in unit testing.</li>
</ul>
<h3 id="utility">Utility</h3>
<p><em>Libraries which provide general utility functions.</em></p>
<ul>
<li><a href="https://github.com/alibaba/arthas">Arthas</a> - Allows to
troubleshoot production issues for applications without modifying code
or restarting servers.</li>
<li><a
href="https://github.com/vladimir-bukhtoyarov/bucket4j">bucket4j</a> -
Rate limiting library based on token-bucket algorithm.</li>
<li><a href="https://github.com/yegor256/cactoos">cactoos</a> -
Collection of object-oriented primitives.</li>
<li><a href="https://github.com/cleopatra27/chocotea">Chocotea</a> -
Generates postman collection, environment and integration tests from
java code.</li>
<li><a href="http://www.crashub.org">CRaSH</a> - Provides a shell into a
JVM that’s running CRaSH. Used by Spring Boot and others.
(LGPL-2.1-or-later)</li>
<li><a href="https://github.com/PatMartin/Dex">Dex</a> - Java/JavaFX
tool capable of powerful ETL and data visualization.</li>
<li><a href="https://github.com/marianobarrios/dregex">dregex</a> -
Regular expression engine that uses deterministic finite automata. It
supports some Perl-style features and yet retains linear matching time,
and also offers set operations.</li>
<li><a href="https://github.com/embulk/embulk">Embulk</a> - Bulk data
loader that helps data transfer between various databases, storages,
file formats, and cloud services.</li>
<li><a
href="https://github.com/vorburger/ch.vorburger.fswatch">fswatch</a> -
Micro library to watch for directory file system changes, simplifying
java.nio.file.WatchService.</li>
<li><a href="https://github.com/gephi/gephi">Gephi</a> - Cross-platform
for visualizing and manipulating large graph networks.
(GPL-3.0-only)</li>
<li><a href="https://github.com/google/guava">Guava</a> - Collections,
caching, primitives support, concurrency libraries, common annotations,
string processing, I/O, and more.</li>
<li><a href="https://jade.tilab.com">JADE</a> - Framework and
environment for building and debugging multi-agent systems.
(LGPL-2.0-only)</li>
<li><a href="https://java-diff-utils.github.io/java-diff-utils/">Java
Diff Utils</a> - Utilities for text or data comparison and
patching.</li>
<li><a
href="https://github.com/VerbalExpressions/JavaVerbalExpressions">JavaVerbalExpressions</a>
- Library that helps with constructing difficult regular
expressions.</li>
<li><a href="https://www.eclipse.org/jgit/">JGit</a> - Lightweight, pure
Java library implementing the Git version control system.</li>
<li><a href="https://github.com/evpl/jkscope">JKScope</a> - Java scope
functions inspired by Kotlin.</li>
<li><a href="https://github.com/minio/minio-java">minio-java</a> -
Provides simple APIs to access any Amazon S3-compatible object storage
server.</li>
<li><a href="https://protege.stanford.edu">Protégé</a> - Provides an
ontology editor and a framework to build knowledge-based systems.</li>
<li><a href="https://github.com/semver4j/semver4j">Semver4j</a> -
Lightweight library that helps you handling semantic versioning with
different modes.</li>
<li><a
href="https://github.com/javadev/underscore-java">Underscore-java</a> -
Port of Underscore.js functions.</li>
</ul>
<h3 id="version-managers">Version Managers</h3>
<p><em>Utilities that help create the development shell environment and
switch between different Java versions.</em></p>
<ul>
<li><a href="https://github.com/shyiko/jabba">jabba</a> - Java Version
Manager inspired by nvm. Supports macOS, Linux and Windows.</li>
<li><a href="https://github.com/jenv/jenv">jenv</a> - Java Version
Manager inspired by rbenv. Can configure globally or per project. Tested
on Debian and macOS.</li>
<li><a href="https://github.com/sdkman/sdkman-cli">SDKMan</a> - Java
Version Manager inspired by RVM and rbenv. Supports UNIX-based platforms
and Windows.</li>
</ul>
<h3 id="web-crawling">Web Crawling</h3>
<p><em>Libraries that analyze the content of websites.</em></p>
<ul>
<li><a href="https://nutch.apache.org">Apache Nutch</a> - Highly
extensible, highly scalable web crawler for production
environments.</li>
<li><a href="https://github.com/yasserg/crawler4j">Crawler4j</a> -
Simple and lightweight web crawler.</li>
<li><a href="https://jsoup.org">jsoup</a> - Scrapes, parses, manipulates
and cleans HTML.</li>
<li><a href="http://stormcrawler.net">StormCrawler</a> - SDK for
building low-latency and scalable web crawlers.</li>
<li><a href="https://github.com/code4craft/webmagic">webmagic</a> -
Scalable crawler with downloading, url management, content extraction
and persistent.</li>
</ul>
<h3 id="web-frameworks">Web Frameworks</h3>
<p><em>Frameworks that handle the communication between the layers of a
web application.</em></p>
<ul>
<li><a href="https://activej.io">ActiveJ</a> - Lightweight asynchronous
framework built from the ground up for developing high-performance web
applications.</li>
<li><a href="https://tapestry.apache.org">Apache Tapestry</a> -
Component-oriented framework for creating dynamic, robust, highly
scalable web applications.</li>
<li><a href="https://wicket.apache.org">Apache Wicket</a> -
Component-based web application framework similar to Tapestry, with a
stateful GUI.</li>
<li><a href="https://github.com/lets-blade/blade">Blade</a> -
Lightweight, modular framework that aims to be elegant and simple.</li>
<li><a href="https://bootique.io">Bootique</a> - Minimally opinionated
framework for runnable apps.</li>
<li><a href="http://www.fireflysource.com">Firefly</a> - Asynchronous
framework for rapid development of high-performance web
application.</li>
<li><a href="https://javalin.io/">Javalin</a> - Microframework for web
applications.</li>
<li><a href="http://www.jooby.org">Jooby</a> - Scalable, fast and
modular micro-framework that offers multiple programming models.</li>
<li><a href="http://www.ninjaframework.org">Ninja</a> - Full-stack web
framework.</li>
<li><a href="http://www.pippo.ro">Pippo</a> - Small, highly modularized,
Sinatra-like framework.</li>
<li><a href="https://www.playframework.com">Play</a> - Built on Akka, it
provides predictable and minimal resource consumption (CPU, memory,
threads) for highly-scalable applications in Java and Scala.</li>
<li><a href="https://www.primefaces.org">PrimeFaces</a> - JSF framework
with both free and commercial/support versions and frontend
components.</li>
<li><a href="https://ratpack.io">Ratpack</a> - Set of libraries that
facilitate fast, efficient, evolvable and well-tested HTTP
applications.</li>
<li><a href="https://github.com/yegor256/takes">Takes</a> - Opinionated
web framework which is built around the concepts of True Object-Oriented
Programming and immutability.</li>
<li><a href="https://vaadin.com">Vaadin</a> - Event-driven framework
that uses standard web components. Server-side architecture with Ajax on
the client side.</li>
</ul>
<h3 id="workflow-orchestration-engines">Workflow Orchestration
Engines</h3>
<ul>
<li><a href="https://cadenceworkflow.io">Cadence</a> - Stateful code
platform from Uber.</li>
<li><a href="https://github.com/flowable/flowable-engine">flowable</a> -
Compact and efficient workflow and business process management
platform.</li>
<li><a href="https://temporal.io">Temporal</a> - Microservice
orchestration platform, forked from Cadence but gRPC based.</li>
</ul>
<h2 id="resources">Resources</h2>
<h3 id="related-awesome-lists">Related Awesome Lists</h3>
<p><em>Awesome Lists related to the Java &amp; JVM ecosystem.</em></p>
<ul>
<li><a
href="https://github.com/gunnarmorling/awesome-annotation-processing">Awesome
Annotation Processing</a></li>
<li><a href="https://github.com/neomatrix369/awesome-graal">Awesome
Graal</a></li>
<li><a href="https://github.com/ksoichiro/awesome-gradle">Awesome Gradle
Plugins</a></li>
<li><a
href="https://github.com/mhrimaz/AwesomeJavaFX">AwesomeJavaFX</a></li>
<li><a href="https://github.com/deephacks/awesome-jvm">Awesome
JVM</a></li>
<li><a href="https://github.com/mfornos/awesome-microservices">Awesome
Microservices</a></li>
<li><a href="https://github.com/marmelab/awesome-rest">Awesome
REST</a></li>
<li><a
href="https://github.com/christian-bromann/awesome-selenium">Awesome
Selenium</a></li>
<li><a href="https://github.com/eminyagiz42/awesome-hybris">Awesome
Hybris</a></li>
<li><a
href="https://github.com/ciandcd/awesome-ciandcd">ciandcd</a></li>
<li><a href="https://github.com/Vedenin/useful-java-links">Useful Java
Links</a></li>
<li><a
href="https://github.com/code-review-checklists/java-concurrency">Java
Concurrency Checklist</a></li>
<li><a href="https://github.com/s4kibs4mi/java-developer-roadmap">Java
Developer Roadmap</a></li>
</ul>
<h3 id="communities">Communities</h3>
<p><em>Active discussions.</em></p>
<ul>
<li><a href="https://www.reddit.com/r/java/">r/java</a> - Subreddit for
the Java community.</li>
<li><a href="https://stackoverflow.com/questions/tagged/java">Stack
Overflow</a> - Question/answer platform.</li>
</ul>
<h3 id="frontends">Frontends</h3>
<p><em>Websites that provide a frontend for this list. Please note,
there won’t be an official website. We don’t associate with a particular
website and everybody is allowed to create one.</em></p>
<ul>
<li><a href="https://java.libhunt.com">java.libhunt.com</a></li>
</ul>
<h3 id="influential-books">Influential Books</h3>
<p><em>Books that made a big impact and are still worth
reading.</em></p>
<ul>
<li><a
href="https://www.amazon.com/Core-Java-I-Fundamentals-10th/dp/0134177304">Core
Java Volume I–Fundamentals</a></li>
<li><a
href="https://www.amazon.com/Core-Java-II-Advanced-Features-10th/dp/0134177290">Core
Java, Volume II–Advanced Features</a></li>
<li><a
href="https://www.amazon.com/Effective-Java-3rd-Joshua-Bloch/dp/0134685997">Effective
Java (3rd Edition)</a></li>
<li><a
href="https://www.oreilly.com/library/view/head-first-java/9781492091646/">Head
First Java (3rd Edition)</a></li>
<li><a
href="https://www.amazon.com/Java-Concurrency-Practice-Brian-Goetz/dp/0321349601">Java
Concurrency in Practice</a></li>
<li><a
href="https://www.manning.com/books/the-well-grounded-java-developer-second-edition">The
Well-Grounded Java Developer (2nd Edition)</a></li>
<li><a
href="https://www.amazon.com/Thinking-Java-Edition-Bruce-Eckel/dp/0131872486">Thinking
in Java</a></li>
</ul>
<h3 id="podcasts-and-screencasts">Podcasts and Screencasts</h3>
<p><em>Something to look at or listen to while programming.</em></p>
<ul>
<li><a
href="https://twitter.com/debugagent/status/1491075324805001219">140
Second Ducklings</a> - Short videos on Twitter explaining Java debugging
in depth.</li>
<li><a href="https://bootifulpodcast.fm">A Bootiful Podcast</a></li>
<li><a href="https://foojay.io/today/category/podcast/">Foojay
Podcast</a></li>
<li><a href="https://inside.java/podcast">Inside Java</a>
(Official)</li>
<li><a href="http://www.javaoffheap.com">Java Off Heap</a></li>
<li><a href="http://www.javaposse.com">The Java Posse</a> - Discontinued
as of 02/2015.</li>
</ul>
<h3 id="people">People</h3>
<h4 id="twitter">Twitter</h4>
<p><em>Active accounts to follow. Descriptions from Twitter.</em></p>
<ul>
<li><a href="https://twitter.com/AdamBien">Adam Bien</a> - Freelance
author, JavaOne Rockstar speaker, consultant, Java Champion.</li>
<li><a href="https://twitter.com/shipilev">Aleksey Shipilëv</a> -
Performance geek, benchmarking czar, concurrency bug hunter.</li>
<li><a href="https://twitter.com/agoncal">Antonio Goncalves</a> - Java
Champion, JUG Leader, Devoxx France, Java EE 6/7, JCP, Author.</li>
<li><a href="https://twitter.com/arungupta">Arun Gupta</a> - Java
Champion, JavaOne Rockstar, JUG Leader, Devoxx4Kids-er, VP of Developer
Advocacy at Couchbase.</li>
<li><a href="https://twitter.com/BrianGoetz">Brian Goetz</a> - Java
Language Architect at Oracle.</li>
<li><a href="https://twitter.com/brunoborges">Bruno Borges</a> - Product
Manager/Java Jock at Oracle.</li>
<li><a href="https://twitter.com/noctarius2k">Chris Engelbert</a> - Open
Source Enthusiast, Speaker, Developer, Developer Advocacy at
TimescaleDB.</li>
<li><a href="https://twitter.com/crichardson">Chris Richardson</a> -
Software architect, consultant, and serial entrepreneur, Java Champion,
JavaOne Rock Star, *POJOs in Action- author.</li>
<li><a href="https://twitter.com/edburns">Ed Burns</a> - Consulting
Member of the Technical Staff at Oracle.</li>
<li><a href="https://twitter.com/baeldung">Eugen Paraschiv</a> - Author
of the Spring Security Course.</li>
<li><a href="https://twitter.com/heinzkabutz">Heinz Kabutz</a> - Java
Champion, speaker, author of The Java Specialists’ Newsletter,
concurrency performance expert.</li>
<li><a href="https://twitter.com/holly_cummins">Holly Cummins</a> -
Technical Lead of IBM London’s Bluemix Garage, Java Champion, developer,
author, JavaOne rockstar.</li>
<li><a href="https://twitter.com/JavaFXpert">James Weaver</a> -
Java/JavaFX/IoT developer, author and speaker.</li>
<li><a href="https://twitter.com/Java_EE">Java EE</a> - Official Java EE
Twitter account.</li>
<li><a href="https://twitter.com/Oraclejavamag">Java Magazine</a> -
Official Java Magazine account.</li>
<li><a href="https://twitter.com/java">Java</a> - Official Java Twitter
account.</li>
<li><a href="https://twitter.com/javinpaul">Javin Paul</a> - Well-known
Java blogger.</li>
<li><a href="https://twitter.com/starbuxman">Josh Long</a> - Spring
Advocate at Pivotal, author of O’Reilly’s Cloud Native Java- and
Building Microservices with Spring Boot, JavaOne Rock Star.</li>
<li><a href="https://twitter.com/lukaseder">Lukas Eder</a> - Java
Champion, speaker, Founder and CEO Data Geekery (jOOQ).</li>
<li><a href="https://twitter.com/theNeomatrix369">Mani Sarkar</a> - Java
champion, Polyglot, Software Crafter involved with <span
class="citation" data-cites="graalvm">@graalvm</span>, AI/ML/DL, Data
Science, Developer communities, speaker &amp; blogger. Creator of couple
of awesome lists like this one.</li>
<li><a href="https://twitter.com/mariofusco">Mario Fusco</a> -
RedHatter, JUG coordinator, frequent speaker and author.</li>
<li><a href="https://twitter.com/MkHeck">Mark Heckler</a> - Pivotal
Principal Technologist and Developer Advocate, conference speaker,
published author, and Java Champion, focusing on Internet of Things and
the cloud.</li>
<li><a href="https://twitter.com/mreinhold">Mark Reinhold</a> - Chief
Architect, Java Platform Group, Oracle.</li>
<li><a href="https://twitter.com/myfear">Markus Eisele</a> - Java EE
evangelist, Red Hat.</li>
<li><a href="https://twitter.com/karianna">Martijn Verburg</a> - London
JUG co-leader, speaker, author, Java Champion and much more.</li>
<li><a href="https://twitter.com/mjpt777">Martin Thompson</a> - Pasty
faced performance gangster.</li>
<li><a href="https://twitter.com/mon_beck">Monica Beckwith</a> -
Performance consultant, JavaOne Rock Star.</li>
<li><a href="https://twitter.com/OpenJDK">OpenJDK</a> - Official OpenJDK
account.</li>
<li><a href="https://twitter.com/PeterLawrey">Peter Lawrey</a> - Peter
Lawrey, Java performance expert.</li>
<li><a href="https://twitter.com/randyshoup">Randy Shoup</a> - Stitch
Fix VP Engineering, speaker, JavaOne Rock Star.</li>
<li><a href="https://twitter.com/reza_rahman">Reza Rahman</a> - Java
EE/GlassFish/WebLogic evangelist, author, speaker, open source
hacker.</li>
<li><a href="https://twitter.com/Sander_Mak">Sander Mak</a> - Java
Champion, author.</li>
<li><a href="https://twitter.com/sjmaple">Simon Maple</a> - Java
Champion, VirtualJUG founder, LJC leader, RebelLabs author.</li>
<li><a href="https://twitter.com/spencerbgibb">Spencer Gibb</a> -
Software Engineer, Dad, Geek, Co-founder and Lead of Spring Cloud Core
<span class="citation" data-cites="pivotal">@pivotal</span>.</li>
<li><a href="https://twitter.com/jodastephen">Stephen Colebourne</a> -
Java Champion, speaker.</li>
<li><a href="https://twitter.com/trisha_gee">Trisha Gee</a> - Java
Champion and speaker.</li>
<li><a href="https://twitter.com/venkat_s">Venkat Subramaniam</a> -
Author, University of Houston professor, MicroSoft MVP award recipient,
JavaOne Rock Star, Java Champion.</li>
<li><a href="https://twitter.com/vlad_mihalcea">Vlad Mihalcea</a> - Java
Champion working on Hypersistence Optimizer, database aficionado, author
of High-Performance Java Persistence book.</li>
</ul>
<h4 id="other-1">Other</h4>
<ul>
<li><a
href="https://apexapps.oracle.com/pls/apex/f?p=119297:3::::::">Groundbreakers</a>
- Oracle ACEs, Groundbreaker Ambassadors and Java Champions.</li>
</ul>
<h3 id="websites">Websites</h3>
<p><em>Sites to read.</em></p>
<ul>
<li><a href="https://www.baeldung.com">Baeldung</a></li>
<li><a href="https://dzone.com">Dzone</a></li>
<li><a href="https://foojay.io">foojay.io</a></li>
<li><a href="https://google.github.io/styleguide/javaguide.html">Google
Java Style</a></li>
<li><a href="https://www.infoq.com">InfoQ</a></li>
<li><a href="https://algs4.cs.princeton.edu/code">Java Algorithms and
Clients</a></li>
<li><a href="https://blog.jooq.org">Java, SQL, and jOOQ</a></li>
<li><a
href="https://community.oracle.com/community/java">Java.net</a></li>
<li><a
href="https://dzone.com/java-jdk-development-tutorials-tools-news">Javalobby</a></li>
<li><a href="https://www.javaworld.com">JavaWorld</a></li>
<li><a href="https://jaxenter.com">JAXenter</a></li>
<li><a href="https://zeroturnaround.com/rebellabs">RebelLabs</a></li>
<li><a href="https://blog.overops.com">OverOps Blog</a></li>
<li><a href="http://www.theserverside.com">TheServerSide.com</a></li>
<li><a href="https://vanilla-java.github.io">Vanilla Java</a></li>
<li><a href="https://www.voxxed.com">Voxxed</a></li>
<li><a href="https://discu.eu/weekly/java/">Java Weekly</a></li>
</ul>
<h2 id="contributing">Contributing</h2>
<p>Contributions are very welcome!</p>
<p>Please have a look at the <a
href="https://github.com/akullpp/awesome-java/blob/master/CONTRIBUTING.md">CONTRIBUTING</a>
guidelines and <a
href="https://github.com/akullpp/awesome-java-lint">the validation
tools</a>.</p>
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