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Awesome

An open API service indexing awesome lists of open source software.

awesome-java

A curated list of awesome frameworks, libraries and software for the Java programming language.
https://github.com/akullpp/awesome-java

Last synced: 10 days ago
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  • Resources

  • Projects

    • Bytecode Manipulation

      • ASM - All-purpose, low-level bytecode manipulation and analysis.
      • Byte Buddy - Further simplifies bytecode generation with a fluent API.
      • Perses - Dynamically injects failure/latency at the bytecode level according to principles of chaos engineering.
      • cglib - Bytecode generation library.
      • Recaf - JVM reverse engineering toolkit, essentially an IDE for Java bytecode.
      • Javassist - Tries to simplify bytecode editing.
      • Maker - Provides low level bytecode generation.
      • Mixin - Manipulate bytecode at runtime using real Java code.
      • Perses - Dynamically injects failure/latency at the bytecode level according to principles of chaos engineering.
      • bytecode-viewer - Java 8 Jar & Android APK reverse engineering suite. (GPL-3.0-only)
      • ASM - All-purpose, low-level bytecode manipulation and analysis.

    • Caching

      • cache2k - In-memory high performance caching library.
      • Ehcache - Distributed general-purpose cache.
      • Infinispan - Highly concurrent key/value datastore used for caching.
      • Caffeine - High-performance, near-optimal caching library.

    • CLI

      • JCommander - Command-line argument-parsing framework with custom types and validation via implementing interfaces.
      • picocli - ANSI colors and styles in usage help with annotation-based POSIX/GNU/any syntax, subcommands, strong typing for both options and positional args.
      • Jexer - Advanced console (and Swing) text user interface (TUI) library, with mouse-draggable windows, built-in terminal window manager, and sixel image support. Looks like [Turbo Vision](https://en.wikipedia.org/wiki/Turbo_Vision).
      • Lanterna - Easy console text-GUI library, similar to curses. (LGPL-3.0-only)
      • Airline - Annotation-based framework for parsing Git-like command-line arguments.
      • Text-IO - Aids the creation of full console-based applications.
      • jbock - Reflectionless command line parser.
      • Jansi - ANSI escape codes to format console output.
      • JLine - Includes features from modern shells like completion or history.

    • Cluster Management

      • Apache Aurora - Mesos framework for long-running services and cron jobs.
      • Singularity - Mesos framework that makes deployment and operations easy. It supports web services, background workers, scheduled jobs, and one-off tasks.

    • Code Analysis

      • jQAssistant - Static code analysis with Neo4J-based query language. (GPL-3.0-only)
      • PMD - Source code analysis for finding bad coding practices.
      • Checkstyle - Static analysis of coding conventions and standards. (LGPL-2.1-or-later)
      • Error Prone - Catches common programming mistakes as compile-time errors.
      • Error Prone Support - Error Prone extensions: extra bug checkers and a large battery of Refaster templates.
      • Infer - Modern static analysis tool for verifying the correctness of code.
      • p3c - Provides Alibaba's coding guidelines for PMD, IDEA and Eclipse.
      • SonarJava - Static analyzer for SonarQube & SonarLint. (LGPL-3.0-only)
      • Spoon - Library for analyzing and transforming Java source code.
      • jQAssistant - Static code analysis with Neo4J-based query language. (GPL-3.0-only)
      • RefactorFirst - Identifies and prioritizes God Classes and Highly Coupled classes.
      • Spotbugs - Static analysis of bytecode to find potential bugs. (LGPL-2.1-only)
      • NullAway - Eliminates NullPointerExceptions with low build-time overhead.

    • Code Generators

      • Bootify ![c - Browser-based Spring Boot app generation with JPA model and REST API.
      • Immutables - Annotation processors to generate simple, safe and consistent value objects.
      • JPA Buddy ![c - 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.
      • ADT4J - JSR-269 code generator for algebraic data types.
      • FreeBuilder - Automatically generates the Builder pattern.
      • Record-Builder - Companion builder class, withers and templates for Java records.
      • Telosys - Simple and light code generator available as an Eclipse Plugin and also as a CLI.
      • JSpecify Package-Info Generator - Maven plugin that automatically generates package-info.java files with JSpecify annotations (@NullMarked and @NullUnmarked), helping you manage nullness boundaries in your Java projects without manual boilerplate.
      • Auto - Generates factory, service, and value classes.
      • Avaje Http Server - Generates Lightweight JAX-RS style http servers using Javalin or Helidon (Nima) SE.
      • EasyEntityToDTO - Annotation processor for automatic DTO and Mapper generation with zero boilerplate.
      • Geci - Discovers files that need generated code, updates automatically and writes to the source with a convenient API.
      • JavaPoet - API to generate source files.
      • JHipster - Yeoman source code generator for Spring Boot and AngularJS.
      • Joda-Beans - Small framework that adds queryable properties to Java, enhancing JavaBeans.
      • Bootify ![c - Browser-based Spring Boot app generation with JPA model and REST API.

    • Compiler-compiler

      • JFlex - Lexical analyzer generator.
      • JavaCC - Parser generator that generates top-down parsers. Allows lexical state switching and permits extended BNF specifications.

    • Computer Vision

      • BoofCV - Library for image processing, camera calibration, tracking, SFM, MVS, 3D vision, QR Code and much more.
      • ImageJ - Medical image processing application with an API.
      • JavaCV - Java interface to OpenCV, FFmpeg, and much more.

    • Configuration

      • ini4j - Provides an API for handling Windows' INI files.
      • microconfig - 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.
      • dotenv - Twelve-factor configuration library which uses environment-specific files.
      • avaje config - Loads yaml and properties files, supports dynamic configuration, plugins, file-watching and config event listeners.
      • centraldogma - Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2.
      • config - Configuration library supporting Java properties, JSON or its human optimized superset HOCON.
      • Configurate - Configuration library with support for various configuration formats and transformations.
      • Curator Framework - High-level API for Apache ZooKeeper.
      • Externalized Properties - Lightweight yet powerful configuration library which supports resolution of properties from external sources and an extensible post-processing/conversion mechanism.
      • Gestalt - 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.
      • KAConf - Annotation-based configuration system for Java and Kotlin.
      • owner - Reduces boilerplate of properties.

    • Constraint Satisfaction Problem Solver

      • Choco - Off-the-shelf constraint satisfaction problem solver that uses constraint programming techniques.
      • OptaPlanner - Business planning and resource scheduling optimization solver.
      • Timefold - Flexible solver with Spring/Quarkus support and quickstarts for the Vehicle Routing Problem, Maintenance Scheduling, Employee Shift Scheduling and much more.
      • JaCoP - Includes an interface for the FlatZinc language, enabling it to execute MiniZinc models. (AGPL-3.0)

    • CSV

      • opencsv - Simple CSV parser.
      • FastCSV - Performance-optimized, dependency-free and RFC 4180 compliant.
      • jackson-dataformat-csv - Jackson extension for reading and writing CSV.
      • Super CSV - Powerful CSV parser with support for Dozer, Joda-Time and Java 8.
      • uniVocity-parsers - One of the fastest and most feature-complete parsers. Also comes with parsers for TSV and fixed-width records.

    • Data Structures

      • Apache Avro - Data interchange format with dynamic typing, untagged data, and absence of manually assigned IDs.
      • Apache Orc - Fast and efficient columnar storage format for Hadoop-based workloads.
      • HyperMinHash-java - Probabilistic data structure for computing union, intersection, and set cardinality in loglog space.
      • Big Queue - Fast and persistent queue based on memory-mapped files.
      • Persistent Collection - Persistent and immutable analogue of the Java Collections Framework.
      • Protobuf - Google's data interchange format.
      • Tape - Lightning-fast, transactional, file-based FIFO.
      • Wire - Clean, lightweight protocol buffers.
      • RoaringBitmap - Fast and efficient compressed bitmap.
      • SBE - Simple Binary Encoding, one of the fastest message formats around.

    • Database

      • Apache Calcite - Dynamic data management framework. It contains many of the pieces that comprise a typical database management system.
      • Apache Drill - Distributed, schema on-the-fly, ANSI SQL query engine for Big Data exploration.
      • Apache Phoenix - High-performance relational database layer over HBase for low-latency applications.
      • druid - High-performance, column-oriented, distributed data store.
      • H2 - Small SQL database notable for its in-memory functionality.
      • JDBI - Convenient abstraction of JDBC.
      • Lettuce - Lettuce is a scalable Redis client for building non-blocking Reactive applications.
      • MapDB - Embedded database engine that provides concurrent collections backed on disk or in off-heap memory.
      • Querydsl - Typesafe unified queries.
      • Trino - Distributed SQL query engine for big data.
      • Vibur DBCP - JDBC connection pool library with advanced performance monitoring capabilities.
      • FlexyPool - Brings metrics and failover strategies to the most common connection pooling solutions.
      • HSQLDB - HyperSQL 100% Java database.
      • Jest - Client for the Elasticsearch REST API.
      • jetcd - Client library for etcd.
      • CosId - Universal, flexible, high-performance distributed ID generator.
      • Apache ShardingSphere - Distributed SQL transaction & query engine that allows for data sharding, scaling, encryption, and more on any database.
      • ArangoDB - ArangoDB Java driver.
      • Spring Data Dynamic Query - Unified dynamic query interface for Spring Data JPA, MongoDB, and Elasticsearch, enabling advanced JOIN(s), OR logic, scoped conditions, powerful projections and advanced features with zero boilerplate.
      • Chronicle Map - Efficient, in-memory (opt. persisted to disk), off-heap key-value store.
      • Debezium - Low latency data streaming platform for change data capture.
      • eXist - NoSQL document database and application platform. (LGPL-2.1-only)
      • HikariCP - High-performance JDBC connection pool.
      • MariaDB4j - Launcher for MariaDB that requires no installation or external dependencies.
      • Realm - Mobile database to run directly inside phones, tablets or wearables.
      • Redisson - Allows for distributed and scalable data structures on top of a Redis server.
      • Modality - Lightweight ORM with database reverse engineering features.
      • OpenDJ - LDAPv3 compliant directory service, developed for the Java platform, providing a high performance, highly available, and secure store for the identities.
      • Querydsl - Typesafe unified queries.
      • QueryStream - Build JPA Criteria queries using a Stream-like API.
      • QuestDB - High-performance SQL database for time series. Supports InfluxDB line protocol, PostgreSQL wire protocol, and REST.
      • Trino - Distributed SQL query engine for big data.
      • Xodus - Highly concurrent transactional schema-less and ACID-compliant embedded database.
      • Jinq - Typesafe database queries via symbolic execution of Java 8 Lambdas (on top of JPA or jOOQ).
      • Leaf - Distributed ID generate service.
      • requery - 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.
      • Speedment - Database access library that utilizes Java 8's Stream API for querying.
      • Spring Data JPA MongoDB Expressions - Allows you to use MongoDB query language to query your relational database.

    • Dependency Injection

      • Apache DeltaSpike - CDI extension framework.
      • HK2 - Lightweight and dynamic dependency injection framework.
      • Dagger - Compile-time injection framework without reflection.
      • Feather - Ultra-lightweight, JSR-330-compliant dependency injection library.
      • Governator - Extensions and utilities that enhance Google Guice.
      • Guice - Lightweight and opinionated framework that completes Dagger.
      • HK2 - Lightweight and dynamic dependency injection framework.
      • Avaje Inject - Microservice-focused compile-time injection framework without reflection.
      • Inversion of Control
      • JayWire - Lightweight dependency injection framework. (LGPL-3.0-only)

    • Development

      • AspectJ - Seamless aspect-oriented programming extension.
      • DCEVM - JVM modification that allows unlimited redefinition of loaded classes at runtime. (GPL-2.0-only)
      • NoException - Allows checked exceptions in functional interfaces and converts exceptions to Optional return.
      • Tail - Enable infinite recursion using tail call optimization.
      • HotswapAgent - Unlimited runtime class and resource redefinition. (GPL-2.0-only)
      • JavaParser - Parse, modify and generate Java code.
      • Manifold - Re-energizes Java with powerful features like type-safe metaprogramming, structural typing and extension methods.
      • NoException - Allows checked exceptions in functional interfaces and converts exceptions to Optional return.
      • SneakyThrow - Ignores checked exceptions without bytecode manipulation. Can also be used inside Java 8 stream operations.
      • JavaSymbolSolver - Symbol solver.
      • Faux Pas - 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.

    • Distributed Applications

      • Apache Geode - In-memory data management system that provides reliable asynchronous event notifications and guaranteed message delivery.
      • Apache Storm - Realtime computation system.
      • Atomix - Fault-tolerant distributed coordination framework.
      • Axon - Framework for creating CQRS applications.
      • JGroups - Toolkit for reliable messaging and cluster creation.
      • Failsafe - Simple failure handling with retries and circuit breakers.
      • Hazelcast - Highly scalable in-memory datagrid with a free open-source version.
      • Atomix - Fault-tolerant distributed coordination framework.
      • Dropwizard Circuit Breaker - Circuit breaker design pattern for Dropwizard. (GPL-2.0-only)
      • Quasar - Lightweight threads and actors for the JVM.
      • Zuul - Gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
      • JGroups - Toolkit for reliable messaging and cluster creation.
      • resilience4j - Functional fault tolerance library.
      • OpenIG - High-performance reverse proxy server with specialized session management and credential replay functionality.
      • ScaleCube Services - Embeddable Cluster-Membership library based on SWIM and gossip protocol.

    • Distributed Transactions

      • Atomikos - Provides transactions for REST, SOA and microservices with support for JTA and XA.
      • Narayana - Provides support for traditional ACID and compensation transactions, also complies with JTA, JTS and other standards. (LGPL-2.1-only)
      • Seata - Delivers high performance and easy to use distributed transaction services under a microservices architecture.

    • Distribution

      • Boxfuse ![c - Deployment of JVM applications to AWS using the principles of immutable infrastructure.
      • Central Repository - 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.
      • Cloudsmith ![c - Fully managed package management SaaS with support for Maven/Gradle/SBT with a free tier.
      • jDeploy - Deploy desktop apps as native Mac, Windows or Linux bundles.
      • Nexus ![c - Binary management with proxy and caching capabilities.
      • packr - Packs JARs, assets and the JVM for native distribution on Windows, Linux and macOS.
      • really-executable-jars-maven-plugin - Maven plugin for making self-executing JARs.
      • IzPack - Setup authoring tool for cross-platform deployments.
      • jlink.online - Builds optimized runtimes over HTTP.
      • Artipie - Binary artifact management toolkit which hosts them on the file system or S3.
      • Capsule - Simple and powerful packaging and deployment. A fat JAR on steroids, or a "Docker for Java" that supports JVM-optimized containers.
      • Getdown - System for deploying Java applications to end-user computers and keeping them up to date. Developed as an alternative to Java Web Start.
      • JavaPackager - 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.

    • Document Processing

      • Apache POI - Supports OOXML (XLSX, DOCX, PPTX) as well as OLE2 (XLS, DOC or PPT).
      • documents4j - API for document format conversion using third-party converters such as MS Word.
      • docx4j - Create and manipulate Microsoft Open XML files.
      • fastexcel - High performance library to read and write large Excel (XLSX) worksheets.
      • zerocell - Annotation-based API for reading data from Excel sheets into POJOs with focus on reduced overhead.

    • Formal Verification

      • KeY - 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)
      • OpenJML - Translates JML specifications into SMT-LIB format and passes the proof problems implied by the program to backend solvers. (GPL-2.0-only)
      • Checker Framework - Pluggable type systems. Includes nullness types, physical units, immutability types and more. (GPL-2.0-only WITH Classpath-exception-2.0)
      • JMLOK 2.0 - 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)
      • CATG - Concolic unit testing engine. Automatically generates unit tests using formal methods.
      • Daikon - Detects likely program invariants and generates JML specs based on those invariants.
      • Java Path Finder (JPF) - JVM formal verification tool containing a model checker and more. Created by NASA.
      • OpenJML - Translates JML specifications into SMT-LIB format and passes the proof problems implied by the program to backend solvers. (GPL-2.0-only)

    • Game Development

      • JBox2D - Port of the renowned C++ 2D physics engine.
      • jMonkeyEngine - Game engine for modern 3D development.
      • LWJGL - Robust framework that abstracts libraries like OpenGL/CL/AL.
      • Mini2Dx - Beginner-friendly, master-ready framework for rapidly prototyping and building 2D games.
      • Litiengine - AWT-based, lightweight 2D game engine.
      • Void2D - High-level 2D game engine with built-in physics based on Swing.
      • vulkan4j - Vulkan, OpenGL ES2 and GLFW Memory Allocator bindings.
      • FXGL - JavaFX Game Development Framework.
      • JBox2D - Port of the renowned C++ 2D physics engine.

    • Geospatial

      • Apache SIS - Library for developing geospatial applications.
      • GeoTools - Library that provides tools for geospatial data. (LGPL-2.1-only)
      • H2GIS - Spatial extension of the H2 database. (LGPL-3.0-only)
      • GraphHopper - Road-routing engine. Used as a Java library or standalone web service.
      • Geo - GeoHash utilities in Java.
      • Jgeohash - Library for using the GeoHash algorithm.
      • Mapsforge - Map rendering based on OpenStreetMap data. (LGPL-3.0-only)
      • Spatial4j - General-purpose spatial/geospatial library.
      • ArcGIS Maps SDK for Java ![c - JavaFX library for adding mapping and GIS functionality to desktop apps.

    • GUI

      • JavaFX - Successor of Swing.
      • SWT - Graphical widget toolkit.
      • JavaFX - Successor of Swing.
      • Sierra - Lightwieght declarative DSL for rapid development of Swing applications.
      • Scene Builder - Visual layout tool for JavaFX applications.
      • SnapKit - Modern Java UI library for both desktop and web.

    • HTTP Clients

      • Avaje Http Client - Wrapper on JDK 11's HttpClient that adds Feign-like interface among other enhancements.
      • methanol - HTTP client extensions library.
      • Apache HttpComponents - Toolset of low-level Java components focused on HTTP and associated protocols.
      • Async Http Client - Asynchronous HTTP and WebSocket client library.
      • Feign - HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket.
      • Google HTTP Client - Pluggable HTTP transport abstraction with support for java.net.HttpURLConnection, Apache HTTP Client, Android, Google App Engine, XML, Gson, Jackson and Protobuf.
      • unirest-java - Simplified, lightweight HTTP client library.
      • Retrofit - Typesafe REST client.
      • Ribbon - Client-side IPC library that is battle-tested in the cloud.
      • Riptide - Client-side response routing for Spring's RestTemplate.

    • IDE

      • jGRASP - Created to provide software visualizations that work in conjunction with the debugger such as Control Structure Diagrams, UML class diagrams and Object Viewer.
      • IntelliJ IDEA ![c - Supports many JVM languages and provides good options for Android development. The commercial edition targets the enterprise sector.
      • SnapCode - Modern IDE for Java running in the browser, focused on education.
      • Visual Studio Code - Provides Java support for lightweight projects with a simple, modern workflow by using extensions from the internal marketplace.

    • Introspection

      • Mirror - 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.
      • Objenesis - Allows dynamic instantiation without default constructor, e.g. constructors which have required arguments, side effects or throw exceptions.
      • ClassGraph - ClassGraph (formerly FastClasspathScanner) is an uber-fast, ultra-lightweight, parallelized classpath scanner and module scanner for Java, Scala, Kotlin and other JVM languages.
      • jOOR - jOOR stands for jOOR Object Oriented Reflection. It is a simple wrapper for the java.lang.reflect package.
      • Mirror - 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.
      • ReflectASM - ReflectASM is a very small Java library that provides high performance reflection by using code generation.
      • Reflections - 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.

    • JSON

      • Genson - Powerful and easy-to-use Java-to-JSON conversion library.
      • jackson-modules-java8 - Set of Jackson modules for Java 8 datatypes and features.
      • Avaje Jsonb - Reflection-free Json binding via source code generation with Jackson-like annotations.
      • HikariJSON - High-performance JSON parser, 2x faster than Jackson.
      • Genson - Powerful and easy-to-use Java-to-JSON conversion library.
      • DSL-JSON - JSON library with advanced compile time databinding.
      • Gson - Serializes objects to JSON and vice versa. Good performance with on-the-fly usage.
      • Jackson-datatype-money - Open-source Jackson module to support JSON serialization and deserialization of JavaMoney data types.
      • Jackson - Similar to GSON, but offers performance gains if you need to instantiate the library more often.
      • JSON-io - Convert Java to JSON. Convert JSON to Java. Pretty print JSON. Java JSON serializer.
      • LoganSquare - JSON parsing and serializing library based on Jackson's streaming API. Outperforms GSON & Jackson's library.
      • Moshi - Modern JSON library, less opinionated and uses built-in types like List and Map.
      • Yasson - Binding layer between classes and JSON documents similar to JAXB.
      • fastjson - Very fast processor with no additional dependencies and full data binding.
      • Jolt - JSON to JSON transformation tool.
      • JsonPath - Extract data from JSON using XPATH-like syntax.
      • JsonSurfer - Streaming JsonPath processor dedicated to processing big and complicated JSON data.

    • JVM and JDK

      • Adopt Open JDK - Community-driven OpenJDK builds, including both HotSpot and OpenJ9.
      • Liberica JDK - Built from OpenJDK, thoroughly tested and passed the JCK. (GPL-2.0-only WITH Classpath-exception-2.0)
      • Open JDK - Open JDK community home. (GPL-2.0-only WITH Classpath-exception-2.0)
      • Zulu - OpenJDK builds for Windows, Linux, and macOS. (GPL-2.0-only WITH Classpath-exception-2.0)
      • OpenJ9 - 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.
      • Which JDK - Overview of common JVMs with pros and cons.
      • Graal - Polyglot embeddable JVM. (GPL-2.0-only WITH Classpath-exception-2.0)
      • Open JDK - Open JDK community home. (GPL-2.0-only WITH Classpath-exception-2.0)
      • ParparVM - VM with non-blocking, concurrent GC for iOS. (GPL-2.0-only WITH Classpath-exception-2.0)
      • RedHat Open JDK - RedHat's OpenJDK distribution. (GPL-2.0-only WITH Classpath-exception-2.0)
      • SAP Machine - SAP's no-cost, rigorously tested and JCK-verified OpenJDK friendly fork. (GPL-2.0-only WITH Classpath-exception-2.0)
      • Microsoft JDK - Microsoft Build of OpenJDK, Free, Open Source, Freshly Brewed!
      • Corretto - No-cost, multiplatform, production-ready distribution of OpenJDK by Amazon. (GPL-2.0-only WITH Classpath-exception-2.0)
      • Dragonwell8 - Downstream version of OpenJDK optimized for online e-commerce, financial, logistics applications.

    • Logging

      • Apache Log4j 2 - Complete rewrite with a powerful plugin and configuration architecture.
      • Graylog - Open-source aggregator suited for extended role and permission management. (GPL-3.0-only)
      • Logback - Robust logging library with interesting configuration options via Groovy.
      • SLF4J - Abstraction layer/simple logging facade.
      • Logstash - Tool for managing log files.
      • Kibana - Analyzes and visualizes log files. Some features require payment.
      • Logback - Robust logging library with interesting configuration options via Groovy.
      • SLF4J - Abstraction layer/simple logging facade.
      • Apache Log4j 2 - Complete rewrite with a powerful plugin and configuration architecture.
      • Echopraxia - 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.
      • Logbook - Extensible, open-source library for HTTP request and response logging.
      • p6spy - Enables logging for all JDBC transactions without changes to the code.
      • OpenTracing Toolbox - Collection of libraries that build on top of OpenTracing and provide extensions and plugins to existing instrumentations.
      • Flogger - Flogger is a fluent logging API for Java. It supports a wide variety of features, and has many benefits over existing logging APIs.

    • Machine Learning

      • Apache Mahout - Scalable algorithms focused on collaborative filtering, clustering and classification.
      • DatumBox - Provides several algorithms and pre-trained models for natural language processing.
      • DJL - High-level and engine-agnostic framework for deep learning.
      • Deeplearning4j - Distributed and multi-threaded deep learning library.
      • Siddhi - Cloud native streaming and complex event processing engine.
      • Tribuo - Provides tools for classification, regression, clustering, model development and interfaces with other libraries such as scikit-learn, pytorch and TensorFlow.
      • JSAT - Algorithms for pre-processing, classification, regression, and clustering with support for multi-threaded execution. (GPL-3.0-only)
      • m2cgen - CLI tool to transpile models into native code.
      • Neureka - A lightweight, platform independent, OpenCL accelerated nd-array/tensor library.
      • Oryx 2 - Framework for building real-time, large-scale machine learning applications. Includes end-to-end applications for collaborative filtering, classification, regression, and clustering.
      • Intelligent java - Seamlessly integrate with remote deep learning and language models programmatically.
      • oj! Algorithms - High-performance mathematics, linear algebra and optimisation needed for data science, machine learning and scientific computing.
      • Smile - Statistical Machine Intelligence and Learning Engine provides a set of machine learning algorithms and a visualization library.

    • Messaging

      • Apache ActiveMQ - Message broker that implements JMS and converts synchronous to asynchronous communication.
      • Apache Camel - Glues together different transport APIs via Enterprise Integration Patterns.
      • Apache Pulsar - Distributed pub/sub-messaging system.
      • Apache RocketMQ - Fast, reliable, and scalable distributed messaging platform.
      • Apache Qpid - Apache Qpid makes messaging tools that speak AMQP and support many languages and platforms.
      • Hermes - Fast and reliable message broker built on top of Kafka.
      • NATS client - NATS client.
      • Deezpatch - Simple, lightweight, and performant dispatch library for decoupling messages (requests and events) and message handlers.
      • EventBus - Simple publish/subscribe event bus.
      • Nakadi - Provides a RESTful API on top of Kafka.
      • Aeron - Efficient, reliable, unicast and multicast message transport.
      • AutoMQ - AutoMQ is a cloud-native, serverless reinvented Kafka that is easily scalable, manage-less and cost-effective.
      • RabbitMQ Java client - RabbitMQ client.
      • Smack - Cross-platform XMPP client library.
      • JeroMQ - Implementation of ZeroMQ.

    • Microservice

      • ActiveRPC - Lightweight and fast library for complex high-load distributed applications and Memcached-like solutions.
      • Nacos - Dynamic service discovery, configuration and service management platform for building cloud native applications.
      • Quarkus - Kubernetes stack tailored for the HotSpot and Graal VM.
      • Armeria - Asynchronous RPC/REST client/server library built on top of Java 8, Netty, HTTP/2, Thrift and gRPC.
      • consul-api - Client for the Consul API: a distributed, highly available and datacenter-aware registry/discovery service.
      • kubernetes-client - Client provides access to the full Kubernetes & OpenShift REST APIs via a fluent DSL.
      • OpenAI-Java - Java libraries for using OpenAI's GPT-3 API.
      • KeenType - Modernized version of a Java-based implementation of the New Typesetting System, which was heavily based on Donald E. Knuth's original TeX.
      • Eureka - REST-based service registry for resilient load balancing and failover.
      • JDA - Wrapping of the Discord REST API and its WebSocket events.
      • Sentinel - Flow control component enabling reliability, resilience and monitoring for microservices.

    • Miscellaneous

      • JBake - Static website generator.
      • JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
      • JPad - Snippet runner.
      • OpenRefine - Tool for working with messy data: cleaning, transforming, extending it with web services and linking it to databases.
      • Togglz - Implementation of the Feature Toggles pattern.
      • JBot - Framework for building chatbots. (GPL-3.0-only)
      • Joda-Money - Basic currency and money classes and algorithms not provided by the JDK.
      • jOOX - Simple wrapper for the org.w3c.dom package, to allow for fluent XML document creation and manipulation with an API inspired by jQuery.
      • LittleProxy - High performance HTTP proxy atop Netty's event-based networking library.
      • Modern Java - A Guide to Java 8 - Popular Java 8 guide.
      • Modernizer - Detect uses of legacy Java APIs.
      • OctoLinker - Browser extension which allows to navigate through code on GitHub more efficiently.
      • TypeTools - Tools for resolving generic types.
      • webcam-capture - Library for using built-in and external webcams directly in Java.
      • XMLBeam - Processes XML by using annotations or XPath within code.
      • JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
      • Membrane Service Proxy - Open-source, reverse-proxy framework.
      • PipelinR - Small utility library for using handlers and commands with pipelines.
      • Polyglot for Maven - Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.
      • Simple Java Mail - Mailing with a clean and fluent API.
      • RR4J - RR4J is a tool that records java bytecode execution and later allows developers to replay locally.
      • Maven Wrapper - Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.
      • Smooks - Framework for fragment-based message processing. (Apache-2.0 OR LGPL-3.0-or-later)
      • Svix - Library for the Svix API to send webhooks and verify signatures.
      • JBang - JBang makes it easy to use Java for scripting. It lets you use a single file for code and dependency management and allows you to run it directly.
      • CQEngine - Ultra-fast, SQL-like queries on Java collections.
      • Design Patterns - Implementation and explanation of the most common design patterns.
      • ISBN core - A small library that contains a representation object of ISBN-10 and ISBN-13 and tools to parse, validate and format one.
      • JEmoji - An auto-generated emoji library that provides type-safe direct access to emojis and alias support for Discord, Slack, GitHub and many more features.
      • Jimfs - In-memory file system.
      • JObfuscator![c - Source code obfuscator.
      • JPad - Snippet runner.
      • jsweet - Source transpiler to TypeScript/JavaScript.
      • MinimalFTP - Lightweight, small and customizable FTP server.
      • yGuard - Obfuscation via renaming and shrinking.
      • FF4J - Feature Flags for Java.
      • FizzBuzz Enterprise Edition - No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes. (No explicit license)
      • IP2Location.io Java SDK - Wrapper for the IP2Location.io Geolocation API and the IP2WHOIS domain WHOIS API.
      • J2ObjC - Java-to-Objective-C translator for porting Android libraries to iOS.
      • JBang - JBang makes it easy to use Java for scripting. It lets you use a single file for

    • Mobile Development

      • Codename One - Cross-platform solution for writing native mobile apps. (GPL-2.0-only WITH Classpath-exception-2.0)
      • MobileUI - Cross-platform framework for developing mobile apps with native UI in Java and Kotlin.
      • Multi-OS Engine - Open-source, cross-platform engine to develop native mobile (iOS, Android, etc.) apps.

    • Monitoring

      • Glowroot - Open-source Java APM.
      • inspectIT - 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.
      • Jolokia - JMX over REST.
      • zipkin - Distributed tracing system which gathers timing data needed to troubleshoot latency problems in microservice architectures.
      • Dropwizard Metrics - Expose metrics via JMX or HTTP and send them to a database.
      • Apitally - Simple, privacy-focused API monitoring, analytics and request logging for Spring Boot apps.
      • Failsafe Actuator - Out of the box monitoring of Failsafe Circuit Breaker in Spring-Boot environment.
      • HertzBeat - Real-time monitoring system with custom-monitor and agentless.
      • Pinpoint - Open-source APM tool.
      • Automon - Combines the power of AOP with monitoring and/or logging tools.
      • Datadog ![c - Modern monitoring & analytics.
      • hippo4j - Dynamic and observable thread pool framework.
      • nudge4j - Remote developer console from the browser for Java 8 via bytecode injection.
      • OpenTelemetry - Instrument, generate, collect, and export telemetry data to help you analyze your software’s performance and behavior.
      • Prometheus - Provides a multi-dimensional data model, DSL, autonomous server nodes and much more.
      • Sentry ![c - Integration with [Sentry](https://github.com/getsentry/sentry), an application error tracking and performance analysis platform.
      • SPM ![c - Performance monitor with distributing transaction tracing for JVM apps.
      • Stagemonitor - Open-source performance monitoring and transaction tracing for JVM apps.
      • Sysmon - Lightweight platform monitoring tool for Java VMs.
      • Jaeger client - Jaeger client.
      • JavaMelody - Performance monitoring and profiling.
      • jmxtrans - 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.
      • Micrometer - Vendor-neutral metrics/observability facade for the most popular metrics/observability libraries.
      • Micrometer Tracing - Vendor-neutral distributed tracing facade for the most popular tracer libraries.

    • Natural Language Processing

      • DKPro - Collection of reusable NLP tools for linguistic pre-processing, machine learning, lexical resources, etc.
      • LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.
      • LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.
      • Hypherator - Java hyphenation library with iterator-like interface. Can be used out-of-the box - dictionaries for multiple languages are bundled in.
      • CogCompNLP - Provides common annotators for plain text input. (Research and Academic Use License)
      • CoreNLP - Provides a set of fundamental tools for tasks like tagging, named entity recognition, and sentiment analysis. (GPL-3.0-or-later)

    • Networking

      • MINA - Abstract, event-driven async I/O API for network operations over TCP/IP and UDP/IP via Java NIO.
      • Undertow - Web server providing both blocking and non-blocking APIs based on NIO. Used as a network layer in WildFly. (LGPL-2.1-only)
      • Drift - Easy-to-use, annotation-based library for creating Thrift clients and serializable types.
      • Comsat - Integrates standard Java web-related APIs with Quasar fibers and actors.
      • Dubbo - High-performance RPC framework.
      • KryoNet - Provides a clean and simple API for efficient TCP and UDP client/server network communication using NIO and Kryo.
      • Fluency - High throughput data ingestion logger to Fluentd and Fluent Bit.
      • Commons-networking - Client for server-sent events (SSE).
      • Grizzly - NIO framework. Used as a network layer in Glassfish.
      • gRPC-java - RPC framework based on protobuf and HTTP/2.
      • ServiceTalk - Framework built on Netty with APIs tailored to specific protocols and support for multiple programming paradigms.
      • TLS Channel - Implements a ByteChannel interface over SSLEngine, enabling easy-to-use (socket-like) TLS.
      • urnlib - Represent, parse and encode URNs, as in RFC 2141. (GPL-3.0-only)
      • sshj - Programmatically use SSH, SCP or SFTP.

    • ORM

      • Apache Cayenne - Provides a clean, static API for data access. Also includes a GUI Modeler for working with database mappings, and DB reverse engineering and generation.
      • Ebean - Provides simple and fast data access.
      • EclipseLink - Supports a number of persistence standards: JPA, JAXB, JCA and SDO.
      • Hibernate - Robust and widely used, with an active community. (LGPL-2.1-only)
      • Doma - 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.
      • MyBatis - Couples objects with stored procedures or SQL statements.
      • MyBatis-Plus - A powerful enhanced toolkit of MyBatis for simplifying development.
      • ObjectiveSql - ActiveRecord ORM for rapid development and convention over configuration.
      • Permazen - Language-natural persistence layer.
      • SimpleFlatMapper - Simple database and CSV mapper.

    • PaaS

    • PDF

      • Apache PDFBox - Toolbox for creating and manipulating PDFs.
      • Dynamic Jasper - Abstraction layer to JasperReports. (LGPL-3.0-only)
      • OpenPDF - Open-source iText fork. (LGPL-3.0-only & MPL-2.0)
      • flyingsaucer - XML/XHTML and CSS 2.1 renderer. (LGPL-2.1-or-later)
      • Apache FOP - Creates PDFs from XSL-FO.
      • Dynamic Jasper - Abstraction layer to JasperReports. (LGPL-3.0-only)
      • iText ![c - Creates PDF files programmatically.
      • JasperReports - Complex reporting engine. (LGPL-3.0-only)
      • Open HTML to PDF - Properly supports modern PDF standards based on flyingsaucer and Apache PDFBox.
      • Dynamic Jasper - Abstraction layer to JasperReports. (LGPL-3.0-only)
      • DynamicReports - Simplifies JasperReports. (LGPL-3.0-only)
      • Tabula - Extracts tables from PDF files.
      • Open HTML to PDF - Properly supports modern PDF standards based on flyingsaucer and Apache PDFBox.

    • Performance analysis

      • fastThread ![c - Analyze and visualize thread dumps with a free cloud-based upload interface.
      • JMH - 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)
      • jHiccup - Logs and records platform JVM stalls.
      • honest-profiler - Low-overhead, bias-free sampling profiler.
      • JITWatch - Analyze the JIT compiler optimisations made by the HotSpot JVM.
      • JMH - 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)
      • LatencyUtils - Utilities for latency measurement and reporting.

    • Platform

      • BCEL - Byte Code Engineering Library - analyze, create, and manipulate Java class files.
      • BeanUtils - Easy-to-use wrappers around the Java reflection and introspection APIs.
      • BeanUtils2 - Redesign of Commons BeanUtils.
      • BSF - Bean Scripting Framework - interface to scripting languages, including JSR-223.
      • ClassScan - Find Class interfaces, methods, fields, and annotations without loading.
      • CLI - Command-line arguments parser.
      • CLI2 - Redesign of Commons CLI.
      • Codec - General encoding/decoding algorithms, e.g. phonetic, base64 or URL.
      • Collections - Extends or augments the Java Collections Framework.
      • Compress - Defines an API for working with tar, zip and bzip2 files.
      • Configuration - Reading of configuration/preferences files in various formats.
      • Convert - Commons-Convert aims to provide a single library dedicated to the task of converting an object of one type to another.
      • CSV - Component for reading and writing comma separated value files.
      • Daemon - Alternative invocation mechanism for unix-daemon-like java code.
      • DBCP - Database connection pooling services.
      • DbUtils - JDBC helper library.
      • Digester - XML-to-Java-object mapping utility.
      • Email - Library for sending e-mail from Java.
      • Exec - API for dealing with external process execution and environment management in Java.
      • FileUpload - File upload capability for your servlets and web applications.
      • Finder - Java library inspired by the UNIX find command.
      • Flatfile - Java library for working with flat data structures.
      • Graph - General purpose graph APIs and algorithms.
      • I18n - Adds the feature of localized message bundles that consist of one or many localized texts that belong together.
      • Id - Id is a component used to generate identifiers.
      • Imaging - Image library.
      • IO - Collection of I/O utilities.
      • Javaflow - Continuation implementation to capture the state of the application.
      • JCI - Java Compiler Interface.
      • JCS - Java Caching System.
      • Jelly - XML based scripting and processing engine.
      • Jexl - Expression language which extends the Expression Language of the JSTL.
      • JNet - JNet allows to use dynamically register url stream handlers through the java.net API.
      • JXPath - Utilities for manipulating Java Beans using the XPath syntax.
      • Lang - Provides extra functionality for classes in java.lang.
      • Monitoring - Monitoring aims to provide a simple but extensible monitoring solution for Java applications.
      • Nabla - Nabla provides automatic differentiation classes that can generate derivative of any function implemented in the Java language.
      • Net - Collection of network utilities and protocol implementations.
      • OpenPGP - Interface to signing and verifying data using OpenPGP.
      • Performance - Small framework for microbenchmark clients, with implementations for Commons DBCP and Pool.
      • Pipeline - Provides a set of pipeline utilities designed around work queues that run in parallel to sequentially process data objects.
      • Pool - Generic object pooling component.
      • SCXML - Implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.
      • Validator - Framework to define validators and validation rules in an xml file.
      • VFS - Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.
      • Weaver - Provides an easy way to enhance (weave) compiled bytecode.
      • CUBA Platform - High-level framework for developing enterprise applications with a rich web interface, based on Spring, EclipseLink and Vaadin.
      • Light-4J - Fast, lightweight and productive microservices framework with built-in [security](https://github.com/networknt/light-oauth2/).
      • Logging - Wrapper around a variety of logging API implementations.
      • RDF - Common implementation of RDF 1.1 that could be implemented by systems on the JVM.
      • RNG - Commons Rng provides implementations of pseudo-random numbers generators.
      • Spring - Provides many packages for dependency injection, aspect-oriented programming, security, etc.
      • Orienteer - Open-source business application platform for rapid configuration/development of CRM, ERP, LMS and other applications.

    • REST Frameworks

      • Jersey - JAX-RS reference implementation.
      • Elide - Opinionated framework for JSON- or GraphQL-APIs based on a JPA data model.
      • Rapidoid - Simple, secure and extremely fast framework consisting of an embedded HTTP server, GUI components and dependency injection.
      • RESTEasy - Fully certified and portable implementation of the JAX-RS specification.
      • Spark - Sinatra inspired framework.
      • Crnk - 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.
      • Swagger - Standard, language-agnostic interface to REST APIs.
      • Crnk - 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.
      • Crnk - 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.
      • Crnk - 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.
      • Crnk - 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.
      • RestExpress - Thin wrapper on the JBoss Netty HTTP stack that provides scaling and performance.
      • springdoc-openapi - Automates the generation of API documentation using Spring Boot projects.
      • Crnk - 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.
      • Crnk - 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.
      • Crnk - 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.
      • Dropwizard - Opinionated framework for setting up modern web applications with Jetty, Jackson, Jersey and Metrics.
      • Microserver - Convenient, extensible microservices plugin system for Spring & Spring Boot. With more than 30 plugins and growing, it supports both micro-monolith and pure microservices styles.
      • rest.li - 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.
      • Restlet Framework - Pioneering framework with powerful routing and filtering capabilities, and a unified client and server API.
      • Crnk - 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.
      • openapi-generator - Allows generation of API client libraries, SDKs, server stubs, documentation and configuration automatically given an OpenAPI Spec.

    • Reactive libraries

      • Akka - Toolkit and runtime for building concurrent, distributed, fault-tolerant and event-driven applications.
      • Reactive Streams - Provides a standard for asynchronous stream processing with non-blocking backpressure.
      • Akka - Toolkit and runtime for building concurrent, distributed, fault-tolerant and event-driven applications.
      • Reactor - A framework for building non-blocking applications on the JVM, providing support for reactive programming.
      • RxJava - Allows for composing asynchronous and event-based programs using observable sequences.

    • Science

      • GraphStream - Library for modeling and analyzing dynamic graphs.
      • JFreeChart - 2D chart library for Swing, JavaFX and server-side applications. (LGPL-2.1-only)
      • JGraphT - Graph library that provides mathematical graph-theory objects and algorithms.
      • BioJava - Facilitates processing biological data by providing algorithms, file format parsers, sequencing and 3D visualization commonly used in bioinformatics.
      • LogicNG - Library for creating, manipulating and solving Boolean and Pseudo-Boolean formulas.
      • Mines Java Toolkit - Library for geophysical scientific computation, visualization and digital signal analysis.
      • Tablesaw - Includes a data-frame, an embedded column store, and hundreds of methods to transform, summarize, or filter data.
      • XChart - Light-weight library for plotting data. Many customizable chart types are available.
      • Morpheus - 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.
      • Erdos - Modular, light and easy graph framework for theoretic algorithms.
      • jSciPy - jSciPy is a Java library designed for scientific computing, offering functionalities inspired by popular scientific computing libraries. It currently provides modules for signal processing, including Butterworth filters, peak finding algorithms, and an RK4 solver for ordinary differential equations.
      • Chart-FX - Scientific charting library with focus on performance optimised real-time data visualisation at 25 Hz update rates for large data sets.
      • Orekit - A low level space flight dynamics library providing basic elements (orbits, dates, attitude, frames...) and various algorithms (conversions, propagations, pointing...) to handle them.
      • Orson-Charts - 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)
      • DataMelt - Environment for scientific computation, data analysis and data visualization. (GPL-3.0-or-later)
      • JGraphX - Library for visualizing (mainly Swing) and interacting with node-edge graphs.
      • Apache Lucene - High-performance, full-featured, cross-platform, text search engine library.
      • Apache Solr - Enterprise search engine optimized for high-volume traffic.
      • Elasticsearch - Distributed, multitenant-capable, full-text search engine with a RESTful web interface and schema-free JSON documents.
      • Indexer4j - Simple and light full text indexing and searching library.
      • Elasticsearch - Distributed, multitenant-capable, full-text search engine with a RESTful web interface and schema-free JSON documents.

    • Security

      • Apache Shiro - Performs authentication, authorization, cryptography and session management.
      • Bouncy Castle - All-purpose cryptographic library and JCA provider offering a wide range of functions, from basic helpers to PGP/SMIME operations.
      • Keycloak - Integrated SSO and IDM for browser apps and RESTful web services.
      • OACC - Provides permission-based authorization services.
      • Passay - Enforce password policy by validating candidate passwords against a configurable rule set.
      • Topaz - Fine-grained authorization for applications with support for RBAC, ABAC, and ReBAC.
      • Hdiv - 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.
      • Jwks RSA - JSON Web Key Set parser.
      • Nbvcxz - Advanced password strength estimation.
      • Password4j - User-friendly cryptographic library that supports Argon2, Bcrypt, Scrypt, PBKDF2 and various other cryptographic hash functions.
      • Tink - Provides a simple and misuse-proof API for common cryptographic tasks.
      • OTP-Java - One-time password generator library according to RFC 4226 (HOTP) and RFC 6238 (TOTP).
      • pac4j - Security engine.
      • Ayza - High-level SSL configuration builder for configuring HTTP clients and servers with SSL/TLS.
      • Bouncy Castle - All-purpose cryptographic library and JCA provider offering a wide range of functions, from basic helpers to PGP/SMIME operations.
      • DependencyCheck - Detects publicly disclosed vulnerabilities contained within a project's dependencies.
      • jjwt - JSON web token for Java and Android.
      • jwt-java - Easily create and parse JSON Web Tokens and create customized JWT validators using a fluent API.
      • Kalium - Binding for the Networking and Cryptography (NaCl) library.
      • Keywhiz - System for distributing and managing secrets.
      • OACC - Provides permission-based authorization services.
      • OpenAM - Access management solution that includes authentication, SSO, authorization, federation, entitlements and web services security.
      • SecurityBuilder - Fluent Builder API for JCA and JSSE classes and especially X.509 certificates.
      • Themis - 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.
      • Keycloak - Integrated SSO and IDM for browser apps and RESTful web services.

    • Server

      • Apache Tomcat - Robust, all-round server for Servlet and JSP.
      • Apache TomEE - Tomcat plus Java EE.
      • WildFly - Formerly known as JBoss and developed by Red Hat with extensive Java EE support. (LGPL-2.1-only)
      • nanohttpd - Tiny, easily embeddable HTTP server.

    • Template Engine

      • Freemarker - Library to generate text output (HTML web pages, e-mails, configuration files, source code, etc.) based on templates and changing data.
      • Pebble - 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.
      • Thymeleaf - Aims to be a substitute for JSP and works for XML files.
      • Jade4J - Implementation of Pug (formerly known as Jade).
      • jstachio - Typesafe Mustache templating engine.
      • Handlebars.java - Logicless and semantic Mustache templates.
      • Jamal - Extendable template engine embedded into Maven/JavaDoc, supporting multiple extensions (Groovy, Ruby, JavaScript, JShell, PlantUml) with support for snippet handling.
      • jte - Compiles to classes, and uses an easy syntax, several features to make development easier and provides fast execution and a small footprint.
      • Jtwig - Modular, configurable and fully tested template engine.
      • Rocker - Optimized, memory efficient and speedy template engine producing statically typed, plain objects.
      • StringTemplate - Template engine for generating source code, web pages, emails, or any other formatted text output.

    • Testing

      • JGiven - Provides a fluent API which allows for simpler composition.
      • Apache JMeter - Functional testing and performance measurements.
      • Arquillian - Integration and functional testing platform for Java EE containers.
      • Citrus - Integration testing framework that focuses on both client- and server-side messaging.
      • JUnit - Common testing framework.
      • jqwik - Engine for property-based testing built on JUnit 5.
      • PIT - Fast mutation-testing framework for evaluating fault-detection abilities of existing JUnit or TestNG test suites.
      • Hamcrest - Matchers that can be combined to create flexible expressions of intent.
      • Truth - Google's fluent assertion and proposition framework.
      • pojo-tester - Automatically performs tests on basic POJO methods. (LGPL-3.0-only)
      • JMockit - Integration testing, API mocking and faking, and code coverage.
      • MockServer - Allows mocking of systems integrated with HTTPS.
      • WireMock - Stubs and mocks web services.
      • REST Assured - DSL for easy testing of REST/HTTP services.
      • J8Spec - Follows a Jasmine-like syntax.
      • JsonUnit - Library that simplifies JSON comparison in tests.
      • Pact JVM - Consumer-driven contract testing.
      • jFairy - Fake data generator.
      • Instancio - Automates data setup in unit tests by generating fully-populated, reproducible objects. Includes JUnit 5 extension.
      • Randomized Testing - JUnit test runner and plugins for running JUnit tests with pseudo-randomness.
      • Java Faker - Port of Ruby's fake data generator.
      • Mockneat - Another fake data generator.
      • selenium - Browser automation framework and ecosystem.
      • LogCaptor - Captures log entries for unit testing purposes.
      • log-capture - Captures log entries and provides assertions for unit and integration testing.
      • Selfie - Snapshot testing (inline and on disk).
      • JMockit - Integration testing, API mocking and faking, and code coverage.
      • Mockito - Mocking framework that lets you write tests with a clean and simple API.
      • PowerMock - Mocks static methods, constructors, final classes and methods, private methods, and removal of static initializers.
      • JSONAssert - Simplifies testing JSON strings.
      • ConcurrentUnit - Toolkit for testing multi-threaded and asynchronous applications.
      • Cucumber - Provides a way to describe features in a plain language which customers can understand.
      • Lamdba Behave - Aims to provide a fluent API to write tests in long and descriptive sentences that read like plain English.
      • Datafaker - Modern fake data generator forked from Java Faker.
      • XMLUnit - Simplifies testing for XML output.
      • Mutability Detector - Reports whether instances of a given class are immutable.
      • raml-tester - Tests if a request/response matches a given RAML definition.
      • Karate - DSL that combines API test-automation, mocks and performance-testing making testing REST/HTTP services easy.
      • Cukes-REST - Collection of Gherkin steps for REST-service testing using Cucumber.
      • JMeter DSL.java - Load tests with JMeter as simple as a JUnit test.
      • cdi-test - JUnit extension for easy and efficient testing of CDI components.
      • JUnit - Common testing framework.
      • weld-testing - Set of test framework extensions (JUnit 4, JUnit 5, Spock) to enhance the testing of CDI components via Weld. Supports Weld 5.
      • ConsoleCaptor - Captures console output for unit testing purposes.
      • junit-dataprovider - TestNG-like data provider/runner for JUnit.
      • junit-pioneer - JUnit 5 extension pack, pushing the frontiers on Jupiter.
      • Stebz - Multi-approach framework for test steps managing.
      • Testcontainers - Provides throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
      • Moco - Concise web services for stubs and mocks.
      • Awaitility - DSL for synchronizing asynchronous operations.
      • Serenity BDD - Automated Acceptance testing and reporting library that works with Cucumber, JBehave and JUnit to make it easier to write high quality executable specifications.
      • AutoParams - Supports generating test data or combining scenarios for parameterized tests.
      • Beanmother - Sets up beans from YAML fixtures.
      • GreenMail - In-memory email server for integration testing. Supports SMTP, POP3 and IMAP including SSL. (GPL-2.0-only)
      • Hoverfly Java - Native bindings for Hoverfly, a proxy which allows you to simulate HTTP services.
      • WebTau - Test across REST-API, Graph QL, Browser, Database, CLI and Business Logic with consistent set of matchers and concepts.
      • Fixture Factory - Generates fake objects from a template.
      • JMock - JMock is a high-performance data generation and simulation component library implemented in Java.
      • EasyMock - EasyMock is a Java library that provides an easy way to use Mock Objects in unit testing.
      • AssertJ - Fluent assertions that improve readability.

    • Utility

      • Protégé - Provides an ontology editor and a framework to build knowledge-based systems.
      • JKScope - Java scope functions inspired by Kotlin.
      • bucket4j - Rate limiting library based on token-bucket algorithm.
      • Gephi - Cross-platform for visualizing and manipulating large graph networks. (GPL-3.0-only)
      • Guava - Collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and more.
      • JADE - Framework and environment for building and debugging multi-agent systems. (LGPL-2.0-only)
      • Javadoc Publisher - Generate Javadoc from your maven/gradle project and deploy it automatically on GitHub Page.
      • Java Diff Utils - Utilities for text or data comparison and patching.
      • JavaVerbalExpressions - Library that helps with constructing difficult regular expressions.
      • JGit - Lightweight, pure Java library implementing the Git version control system.
      • minio-java - Provides simple APIs to access any Amazon S3-compatible object storage server.
      • Semver4j - Lightweight library that helps you handling semantic versioning with different modes.
      • Underscore-java - Port of Underscore.js functions.
      • Arthas - Allows to troubleshoot production issues for applications without modifying code or restarting servers.
      • cactoos - Collection of object-oriented primitives.
      • Chocotea - Generates postman collection, environment and integration tests from java code.
      • CRaSH - Provides a shell into a JVM that's running CRaSH. Used by Spring Boot and others. (LGPL-2.1-or-later)
      • Dex - Java/JavaFX tool capable of powerful ETL and data visualization.
      • Embulk - Bulk data loader that helps data transfer between various databases, storages, file formats, and cloud services.
      • dregex - 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.
      • fswatch - Micro library to watch for directory file system changes, simplifying java.nio.file.WatchService.

    • Web Crawling

      • Apache Nutch - Highly extensible, highly scalable web crawler for production environments.
      • jsoup - Scrapes, parses, manipulates and cleans HTML.
      • Crawler4j - Simple and lightweight web crawler.
      • StormCrawler - SDK for building low-latency and scalable web crawlers.
      • webmagic - Scalable crawler with downloading, url management, content extraction and persistent.

    • Web Frameworks

      • ActiveJ - Lightweight asynchronous framework built from the ground up for developing high-performance web applications.
      • Apache Tapestry - Component-oriented framework for creating dynamic, robust, highly scalable web applications.
      • Apache Wicket - Component-based web application framework similar to Tapestry, with a stateful GUI.
      • Bootique - Minimally opinionated framework for runnable apps.
      • Firefly - Asynchronous framework for rapid development of high-performance web application.
      • Jooby - Scalable, fast and modular micro-framework that offers multiple programming models.
      • Ninja - Full-stack web framework.
      • Pippo - Small, highly modularized, Sinatra-like framework.
      • Play - Built on Akka, it provides predictable and minimal resource consumption (CPU, memory, threads) for highly-scalable applications in Java and Scala.
      • PrimeFaces - JSF framework with both free and commercial/support versions and frontend components.
      • Ratpack - Set of libraries that facilitate fast, efficient, evolvable and well-tested HTTP applications.
      • Vaadin - Event-driven framework that uses standard web components. Server-side architecture with Ajax on the client side.
      • Erupt - Annotation-Driven Low-Code & JPA Visualization
      • Blade - Lightweight, modular framework that aims to be elegant and simple.
      • Firefly - Asynchronous framework for rapid development of high-performance web application.
      • Javalin - Microframework for web applications.
      • Pippo - Small, highly modularized, Sinatra-like framework.
      • Takes - Opinionated web framework which is built around the concepts of True Object-Oriented Programming and immutability.
      • WebForms Core - A technology for managing HTML tags from the server.
      • PrimeFaces - JSF framework with both free and commercial/support versions and frontend components.

    • Workflow Orchestration Engines

      • Cadence - Stateful code platform from Uber.
      • Temporal - Microservice orchestration platform, forked from Cadence but gRPC based.
      • flowable - Compact and efficient workflow and business process management platform.

    • Native

      • JavaCPP - Provides efficient and easy access to native C++.
      • native-lib-loader - Native library loader for extracting and loading native libraries from Java.
      • Aparapi - Converts bytecode to OpenCL which allows execution on GPUs.
      • JNA - Work with native libraries without writing JNI. Also provides interfaces to common system libraries.
      • JNR - 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 [Project Panama](http://openjdk.java.net/projects/panama).

    • Artificial Intelligence

      • LangChain4j - Simplifies integration of LLMs with unified APIs and a comprehensive toolbox.
      • simple-openai - Library to use the OpenAI API (and compatible ones) in the simplest possible way.
      • MCP Java SDK - Enables applications to interact with AI models and tools through a standardized interface (i.e. Model Context Protocol), supporting both synchronous and asynchronous communication patterns.

    • Bean Mapping

      • JMapper - Uses byte code manipulation for lightning-fast mapping. Supports annotations and API or XML configuration.
      • dOOv - 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.
      • Selma - Annotation processor-based bean mapper.
      • MapStruct - Code generator that simplifies mappings between different bean types, based on a convention-over-configuration approach.
      • Orika - JavaBean-mapping framework that recursively copies (among other capabilities) data from one object to another.
      • dOOv - 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.
      • reMap - Lambda and method handle-based mapping which requires code and not annotations if objects have different names.
      • ModelMapper - Intelligent object mapping library that automatically maps objects to each other.
      • Selma - Annotation processor-based bean mapper.

    • Imagery

      • Tess4J - JNA wrapper for Tesseract OCR API.
      • Thumbnailator - High-quality thumbnail generation library.
      • image-comparison - 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.
      • Barcode-Lib4J - Generates QR Code, DataMatrix, and other 1D/2D barcodes as vector (PDF, EPS, SVG) and raster (PNG, BMP, JPG) images with DPI awareness, high precision, and CMYK color model support.
      • Imgscalr - Simple, efficient and hardware-accelerated image-scaling library implemented in pure Java 2D.
      • vips-ffm - Comprehensive bindings for libvips, using Java's "Foreign Function & Memory" API.
      • TwelveMonkeys - Collection of plugins that extend the number of supported image file formats.
      • ZXing - Multi-format 1D/2D barcode image processing library.

    • Build

      • Buck - Encourages the creation of small, reusable modules consisting of code and resources.
      • Bazel - Tool from Google that builds code quickly and reliably.
      • Gradle - Incremental builds programmed via Groovy instead of declaring XML. Works well with Maven's dependency management.
      • Buck2 - Encourages the creation of small, reusable modules consisting of code and resources.

    • Serialization

      • Fury - Blazing fast object graph serialization framework powered by JIT and zero-copy.
      • FlatBuffers - Memory-efficient serialization library that can access serialized data without unpacking and parsing it.
      • Kryo - Fast and efficient object graph serialization framework.
      • FST - JDK-compatible, high-performance object graph serialization.
      • MessagePack - Efficient binary serialization format.
      • Fury - Blazing fast object graph serialization framework powered by JIT and zero-copy.
      • PHP Serializer - Serializing objects in the PHP serialization format.

    • Cloud

    • Job Scheduling

      • Sundial - Lightweight framework to simply define jobs, define triggers and start the scheduler.
      • Quartz - Feature-rich, open source job scheduling library that can be integrated within virtually any Java application.
      • JobRunr - 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.
      • Wisp - Simple library with minimal footprint and straightforward API.
      • db-scheduler - Persistent and cluster-friendly scheduler.
      • easy-batch - 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.
      • shedlock - 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.

    • Functional Programming

      • Functional Java - Implements numerous basic and advanced programming abstractions that assist composition-oriented development.
      • derive4j - Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching and morphisms. (GPL-3.0-only)
      • Fugue - Functional extensions to Guava.
      • jOOλ - 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.
      • Packrat - Gatherers library for Java Stream API. Gatherers can enhance streams with custom intermediate operations.
      • protonpack - Collection of stream utilities.
      • Cyclops - Monad and stream utilities, comprehensions, pattern matching, functional extensions for all JDK collections, future streams, trampolines and much more.
      • StreamEx - Enhances Java 8 Streams.

    • Architecture

      • ArchUnit - Test library for specifying and asserting architecture rules.
      • jMolecules - Annotations and interfaces to express design and architecture concepts in code.

    • Code Coverage

      • Clover - Relies on source-code instrumentation instead of bytecode instrumentation.
      • Cobertura - Relies on offline (or static) bytecode instrumentation and class loading to collect code coverage metrics. (GPL-2.0-only)
      • JaCoCo - Framework that enables collection of code coverage metrics, using both offline and runtime bytecode instrumentation.

    • Date and Time

      • iCal4j - Parse and build iCalendar [RFC 5545](https://tools.ietf.org/html/rfc5545) data models.
      • ThreeTen-Extra - Additional date-time classes that complement those in JDK 8.
      • Time4J - Advanced date and time library. (LGPL-2.1-only)
      • Jollyday - Determines the holidays for a given year, country/name and eventually state/region.

    • High Performance

      • Agrona - Data structures and utility methods that are common in high-performance applications.
      • Disruptor - Inter-thread messaging library.
      • Eclipse Collections - Collections framework inspired by Smalltalk.
      • HPPC - Primitive collections.
      • JCTools - Concurrency tools currently missing from the JDK.
      • Koloboke - Carefully designed extension of the Java Collections Framework with primitive specializations and more.

    • Hypermedia Types

      • Siren4J - Library for the Siren specification.
      • hate - Builds hypermedia-friendly objects according to HAL specification.
      • JSON-LD - JSON-LD implementation.
      • Spring HATEOAS - Standalone and Spring support for building hypermedia-based APIs using HAL, HAL FORMS, Collection+JSON, ALPS and UBER.

    • Processes

      • zt-process-killer - Stops processes started from Java or the system processes via PID.
      • ch.vorburger.exec - Convenient API around Apache Commons Exec.
      • zt-exec - Provides a unified API to Apache Commons Exec and ProcessBuilder.

    • Version Managers

      • SDKMan - Java Version Manager inspired by RVM and rbenv. Supports UNIX-based platforms and Windows.
      • jabba - Java Version Manager inspired by nvm. Supports macOS, Linux and Windows.
      • jenv - Java Version Manager inspired by rbenv. Can configure globally or per project. Tested on Debian and macOS.

    • Pathfinding

      • Pathetic - A highly configurable 3D A\* pathfinding library that uses specific optimizations for high performance.

    • Decentralization

    • Financial

      • Cassandre - Trading bot framework.
      • Parity - Platform for trading venues.
      • Philadelphia - Low-latency financial information exchange.
      • Square - Integration with the Square API.
      • Stripe - Integration with the Stripe API.
      • ta4j - Library for technical analysis.
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Keywords
java 210 android 15 kotlin 15 spring-boot 15 testing 13 microservices 13 spring 13 monitoring 12 static-analysis 11 jvm 11 json 9 java-library 9 database 9 http 9 javascript 8 awesome 8 machine-learning 7 rest-api 7 xml 7 rpc 7 annotation-processor 7 rest 7 python 7 library 6 sql 6 serialization 6 cloud-native 6 jdbc 6 javafx 6 high-performance 6 metrics 6 static-code-analysis 6 awesome-list 6 java-8 6 java8 5 scheduler 5 configuration 5 framework 5 orm 5 gradle 5 cpp 5 grpc 5 c 5 test-automation 5 groovy 5 junit 5 generator 4 sdk 4 api 4 spring-boot-starter 4