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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: 5 days ago
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  • Resources

  • Projects

    • Security

      • 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.
      • 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.

    • Code Analysis

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

    • JSON

      • Gson - Serializes objects to JSON and vice versa. Good performance with on-the-fly usage.
      • Jackson - Similar to GSON, but offers performance gains if you need to instantiate the library more often.
      • Moshi - Modern JSON library, less opinionated and uses built-in types like List and Map.
      • Avaje Jsonb - Reflection-free Json binding via source code generation with Jackson-like annotations.
      • Genson - Powerful and easy-to-use Java-to-JSON conversion library.
      • Genson - Powerful and easy-to-use Java-to-JSON conversion library.

    • Database

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

    • HTTP Clients

      • Retrofit - Typesafe REST client.
      • Apache HttpComponents - Toolset of low-level Java components focused on HTTP and associated protocols.
      • Avaje Http Client - Wrapper on JDK 11's HttpClient that adds Feign-like interface among other enhancements.

    • Data Structures

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

    • Utility

      • 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)
      • JGit - Lightweight, pure Java library implementing the Git version control system.
      • Protégé - Provides an ontology editor and a framework to build knowledge-based systems.

    • Imagery

      • ZXing - Multi-format 1D/2D barcode image processing library.

    • Reactive libraries

      • RxJava - Allows for composing asynchronous and event-based programs using observable sequences.
      • Akka - Toolkit and runtime for building concurrent, distributed, fault-tolerant and event-driven applications.

    • IDE

      • IntelliJ IDEA ![c - Supports many JVM languages and provides good options for Android development. The commercial edition targets the enterprise sector.
      • jGRASP - Created to provide software visualizations that work in conjunction with the debugger such as Control Structure Diagrams, UML class diagrams and Object Viewer.
      • 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.

    • Performance analysis

      • 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)
      • 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)

    • JVM and JDK

      • ParparVM - VM with non-blocking, concurrent GC for iOS. (GPL-2.0-only WITH Classpath-exception-2.0)
      • Adopt Open JDK - Community-driven OpenJDK builds, including both HotSpot and OpenJ9.
      • Corretto - No-cost, multiplatform, production-ready distribution of OpenJDK by Amazon. (GPL-2.0-only WITH Classpath-exception-2.0)
      • 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)
      • RedHat Open JDK - RedHat's OpenJDK distribution. (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)
      • Open JDK - Open JDK community home. (GPL-2.0-only WITH Classpath-exception-2.0)

    • PaaS

    • Distribution

      • Cloudsmith ![c - Fully managed package management SaaS with support for Maven/Gradle/SBT with a free tier.
      • 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.
      • jDeploy - Deploy desktop apps as native Mac, Windows or Linux bundles.
      • Nexus ![c - Binary management with proxy and caching capabilities.
      • IzPack - Setup authoring tool for cross-platform deployments.

    • Bytecode Manipulation

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

    • 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.
      • Jansi - ANSI escape codes to format console output.
      • JLine - Includes features from modern shells like completion or history.
      • Text-IO - Aids the creation of full console-based applications.
      • Lanterna - Easy console text-GUI library, similar to curses. (LGPL-3.0-only)
      • Airline - Annotation-based framework for parsing Git-like command-line arguments.
      • jbock - Reflectionless command line parser.
      • 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).

    • 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 Coverage

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

    • Code Generators

      • Avaje Http Server - Generates Lightweight JAX-RS style http servers using Javalin or Helidon (Nima) SE.
      • 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.
      • Joda-Beans - Small framework that adds queryable properties to Java, enhancing JavaBeans.
      • 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.
      • Telosys - Simple and light code generator available as an Eclipse Plugin and also as a CLI.
      • JHipster - Yeoman source code generator for Spring Boot and AngularJS.
      • ADT4J - JSR-269 code generator for algebraic data types.
      • Auto - Generates factory, service, and value classes.
      • FreeBuilder - Automatically generates the Builder pattern.
      • JavaPoet - API to generate source files.
      • Geci - Discovers files that need generated code, updates automatically and writes to the source with a convenient API.
      • Record-Builder - Companion builder class, withers and templates for Java records.
      • EasyEntityToDTO - Annotation processor for automatic DTO and Mapper generation with zero boilerplate.
      • 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.

    • 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

      • avaje config - Loads yaml and properties files, supports dynamic configuration, plugins, file-watching and config event listeners.
      • Curator Framework - High-level API for Apache ZooKeeper.
      • 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.
      • Configurate - Configuration library with support for various configuration formats and transformations.
      • KAConf - Annotation-based configuration system for Java and Kotlin.
      • config - Configuration library supporting Java properties, JSON or its human optimized superset HOCON.
      • centraldogma - Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2.
      • dotenv - Twelve-factor configuration library which uses environment-specific files.
      • 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.
      • 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.

    • Dependency Injection

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

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

    • 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.
      • Quasar - Lightweight threads and actors for the JVM.
      • Hazelcast - Highly scalable in-memory datagrid with a free open-source version.
      • Dropwizard Circuit Breaker - Circuit breaker design pattern for Dropwizard. (GPL-2.0-only)
      • Failsafe - Simple failure handling with retries and circuit breakers.
      • Atomix - Fault-tolerant distributed coordination framework.

    • 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)

    • 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.

    • Formal Verification

      • Daikon - Detects likely program invariants and generates JML specs based on those invariants.
      • 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)
      • 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)

    • Functional Programming

      • Functional Java - Implements numerous basic and advanced programming abstractions that assist composition-oriented development.

    • Game Development

      • JBox2D - Port of the renowned C++ 2D physics engine.
      • jMonkeyEngine - Game engine for modern 3D development.
      • Litiengine - AWT-based, lightweight 2D game engine.
      • LWJGL - Robust framework that abstracts libraries like OpenGL/CL/AL.
      • Mini2Dx - Beginner-friendly, master-ready framework for rapidly prototyping and building 2D games.

    • 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)

    • GUI

      • JavaFX - Successor of Swing.
      • Scene Builder - Visual layout tool for JavaFX applications.
      • SWT - Graphical widget toolkit.
      • JavaFX - Successor of Swing.

    • High Performance

      • HPPC - Primitive collections.

    • 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.

    • 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)
      • Kibana - Analyzes and visualizes log files. Some features require payment.
      • Logback - Robust logging library with interesting configuration options via Groovy.
      • Logstash - Tool for managing log files.
      • SLF4J - Abstraction layer/simple logging facade.

    • 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.
      • oj! Algorithms - High-performance mathematics, linear algebra and optimisation needed for data science, machine learning and scientific computing.
      • Tribuo - Provides tools for classification, regression, clustering, model development and interfaces with other libraries such as scikit-learn, pytorch and TensorFlow.

    • 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.

    • 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.

    • Miscellaneous

      • JBake - Static website generator.
      • JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
      • JObfuscator![c - Source code obfuscator.
      • Joda-Money - Basic currency and money classes and algorithms not provided by the JDK.
      • JPad - Snippet runner.
      • OpenRefine - Tool for working with messy data: cleaning, transforming, extending it with web services and linking it to databases.
      • Svix - Library for the Svix API to send webhooks and verify signatures.
      • Togglz - Implementation of the Feature Toggles pattern.

    • 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.
      • hippo4j - Dynamic and observable thread pool framework.
      • 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.

    • Natural Language Processing

      • CoreNLP - Provides a set of fundamental tools for tasks like tagging, named entity recognition, and sentiment analysis. (GPL-3.0-or-later)
      • 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.

    • 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)

    • 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)

    • PDF

    • 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.
      • Logging - Wrapper around a variety of logging API implementations.
      • 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.
      • 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.
      • 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.
      • Spring - Provides many packages for dependency injection, aspect-oriented programming, security, etc.

    • REST Frameworks

      • Elide - Opinionated framework for JSON- or GraphQL-APIs based on a JPA data model.
      • Jersey - JAX-RS reference implementation.
      • 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.
      • 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.

    • Science

      • BioJava - Facilitates processing biological data by providing algorithms, file format parsers, sequencing and 3D visualization commonly used in bioinformatics.
      • DataMelt - Environment for scientific computation, data analysis and data visualization. (GPL-3.0-or-later)
      • GraphStream - Library for modeling and analyzing dynamic graphs.
      • JFreeChart - 2D chart library for Swing, JavaFX and server-side applications. (LGPL-2.1-only)
      • Orekit - A low level space flight dynamics library providing basic elements (orbits, dates, attitude, frames...) and various algorithms (conversions, propagations, pointing...) to handle them.
      • 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.

    • 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)

    • 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.

    • 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.
      • JSONAssert - Simplifies testing JSON strings.

    • Web Crawling

      • Apache Nutch - Highly extensible, highly scalable web crawler for production environments.
      • jsoup - Scrapes, parses, manipulates and cleans HTML.

    • 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.
      • Javalin - Microframework for web applications.
      • 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.

    • Workflow Orchestration Engines

      • Cadence - Stateful code platform from Uber.
      • Temporal - Microservice orchestration platform, forked from Cadence but gRPC based.

    • Serialization

      • Fury - Blazing fast object graph serialization framework powered by JIT and zero-copy.

    • Architecture

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

    • Bean Mapping

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

    • Date and Time

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

    • Build

      • Buck - Encourages the creation of small, reusable modules consisting of code and resources.
      • Buck2 - 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.

    • Artificial Intelligence

      • LangChain4j - Simplifies integration of LLMs with unified APIs and a comprehensive toolbox.
      • 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.
      • simple-openai - Library to use the OpenAI API (and compatible ones) in the simplest possible way.

    • Cloud

    • Decentralization

Programming Languages
Java 109 Kotlin 3 HTML 2 Rust 1 TypeScript 1 C++ 1 OCaml 1 C 1
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Keywords
java 65 static-analysis 10 database 7 android 7 static-code-analysis 6 configuration 5 spring 4 code-analysis 4 spring-boot 4 kotlin 4 code-quality 4 redis 3 distributed 3 json 3 xml 3 bytecode 3 annotations 3 gradle 3 jvm 3 abstract-syntax-tree 3 ast 3 code-generation 3 code-generator 3 python 3 cpp 3 persistence 3 sql 3 awesome 3 nosql 3 objective-c 2 console 2 javascript 2 ios 2 golang 2 jpa 2 code-transformation 2 metaprogramming 2 parser 2 exception-handling 2 cloud-native 2 zookeeper 2 rest 2 monitoring 2 library 2 hibernate 2 orm 2 redis-client 2 marshalling 2 rpc 2 serialization 2