fucking-awesome-java

A curated list of awesome frameworks, libraries and software for the Java programming language. With repository stars⭐ and forks🍴
https://github.com/correia-jpv/fucking-awesome-java

Last synced: about 8 hours ago
JSON representation

Projects
- Configuration
  - owner - Reduces boilerplate of properties.
  - 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.
  - 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.
  - 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.
  - KAConf - Annotation-based configuration system for Java and Kotlin.
- Constraint Satisfaction Problem Solver
  - JaCoP - Includes an interface for the FlatZinc language, enabling it to execute MiniZinc models. (AGPL-3.0)
- CSV
  - FastCSV - Performance-optimized, dependency-free and RFC 4180 compliant.
  - uniVocity-parsers - One of the fastest and most feature-complete parsers. Also comes with parsers for TSV and fixed-width records.
  - jackson-dataformat-csv - Jackson extension for reading and writing CSV.
- Data Structures
  - 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.
  - Protobuf - Google's data interchange format.
  - RoaringBitmap - Fast and efficient compressed bitmap.
  - Tape - Lightning-fast, transactional, file-based FIFO.
  - Wire - Clean, lightweight protocol buffers.
  - Persistent Collection - Persistent and immutable analogue of the Java Collections Framework.
  - SBE - Simple Binary Encoding, one of the fastest message formats around.
- Database
  - 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.
  - HikariCP - High-performance JDBC connection pool.
  - Jedis - Small client for interaction with Redis, with methods for commands.
  - Jest - Client for the Elasticsearch REST API.
  - Leaf - Distributed ID generate service.
  - Modality - Lightweight ORM with database reverse engineering features.
  - Querydsl - Typesafe unified queries.
  - QueryStream - Build JPA Criteria queries using a Stream-like API.
  - Realm - Mobile database to run directly inside phones, tablets or wearables.
  - Spring Data JPA MongoDB Expressions - Allows you to use MongoDB query language to query your relational database.
  - Xodus - Highly concurrent transactional schema-less and ACID-compliant embedded database.
  - CosId - Universal, flexible, high-performance distributed ID generator.
  - jetcd - Client library for etcd.
  - Jinq - Typesafe database queries via symbolic execution of Java 8 Lambdas (on top of JPA or jOOQ).
  - MariaDB4j - Launcher for MariaDB that requires no installation or external dependencies.
  - OpenDJ - LDAPv3 compliant directory service, developed for the Java platform, providing a high performance, highly available, and secure store for the identities.
  - QuestDB - High-performance SQL database for time series. Supports InfluxDB line protocol, PostgreSQL wire protocol, and REST.
  - Redisson - Allows for distributed and scalable data structures on top of a Redis server.
  - 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.
  - Apache ShardingSphere - Distributed SQL transaction & query engine that allows for data sharding, scaling, encryption, and more on any database.
- Date and Time
  - Jollyday - Determines the holidays for a given year, country/name and eventually state/region.
  - ThreeTen-Extra - Additional date-time classes that complement those in JDK 8.
  - iCal4j - Parse and build iCalendar 🌎 [RFC 5545](tools.ietf.org/html/rfc5545) data models.
  - Time4J - Advanced date and time library. (LGPL-2.1-only)
- Decentralization
  - java-tron
- Dependency Injection
  - 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.
  - JayWire - Lightweight dependency injection framework. (LGPL-3.0-only)
- Development
  - 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.
  - JavaParser - Parse, modify and generate Java code.
  - SneakyThrow - Ignores checked exceptions without bytecode manipulation. Can also be used inside Java 8 stream operations.
  - HotswapAgent - Unlimited runtime class and resource redefinition. (GPL-2.0-only)
  - JavaSymbolSolver - Symbol solver.
  - Manifold - Re-energizes Java with powerful features like type-safe metaprogramming, structural typing and extension methods.
- Distributed Applications
  - Hazelcast - Highly scalable in-memory datagrid with a free open-source version.
  - JGroups - Toolkit for reliable messaging and cluster creation.
  - Quasar - Lightweight threads and actors for the JVM.
  - Dropwizard Circuit Breaker - Circuit breaker design pattern for Dropwizard. (GPL-2.0-only)
  - Failsafe - Simple failure handling with retries and circuit breakers.
  - 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.
  - Zuul - Gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
- Code Generators
  - 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.
  - Avaje Http Server - Generates Lightweight JAX-RS style http servers using Javalin or Helidon (Nima) SE.
  - Joda-Beans - Small framework that adds queryable properties to Java, enhancing JavaBeans.
  - Telosys - Simple and light code generator available as an Eclipse Plugin and also as a CLI.
  - ADT4J - JSR-269 code generator for algebraic data types.
  - Auto - Generates factory, service, and value classes.
  - EasyEntityToDTO - Annotation processor for automatic DTO and Mapper generation with zero boilerplate.
  - FreeBuilder - Automatically generates the Builder pattern.
  - 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.
  - 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.
  - Record-Builder - Companion builder class, withers and templates for Java records.
- 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.
  - 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.
  - 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.
  - jlink.online - Builds optimized runtimes over HTTP.
  - 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.
- Geospatial
  - ArcGIS Maps SDK for Java ![c - JavaFX library for adding mapping and GIS functionality to desktop apps.
  - ArcGIS Maps SDK for Java ![c - JavaFX library for adding mapping and GIS functionality to desktop apps.
  - Geo - GeoHash utilities in Java.
  - GraphHopper - Road-routing engine. Used as a Java library or standalone web service.
  - H2GIS - Spatial extension of the H2 database. (LGPL-3.0-only)
  - Mapsforge - Map rendering based on OpenStreetMap data. (LGPL-3.0-only)
  - Spatial4j - General-purpose spatial/geospatial library.
- Platform
  - 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.
  - Math - Lightweight, self-contained mathematics and statistics components.
  - 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.
  - OGNL - Object-graph navigation language.
  - 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.
  - Proxy - Library for creating dynamic proxies.
  - 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.
  - CSV - Component for reading and writing comma separated value files.
  - DbUtils - JDBC helper library.
  - Digester - XML-to-Java-object mapping utility.
  - 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.
  - Functor - Function that can be manipulated as an object, or an object representing a single, generic function.
  - 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.
- REST Frameworks
  - 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.
  - 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.
  - RestExpress - Thin wrapper on the JBoss Netty HTTP stack that provides scaling and performance.
  - 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.
  - Restlet Framework - Pioneering framework with powerful routing and filtering capabilities, and a unified client and server API.
  - springdoc-openapi - Automates the generation of API documentation using Spring Boot projects.
  - openapi-generator - Allows generation of API client libraries, SDKs, server stubs, documentation and configuration automatically given an OpenAPI Spec.
- Science
  - GraphStream - Library for modeling and analyzing dynamic graphs.
  - Chart-FX - Scientific charting library with focus on performance optimised real-time data visualisation at 25 Hz update rates for large data sets.
  - Erdos - Modular, light and easy graph framework for theoretic algorithms.
  - JGraphT - Graph library that provides mathematical graph-theory objects and algorithms.
  - JGraphX - Library for visualizing (mainly Swing) and interacting with node-edge graphs.
  - 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.
  - 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.
  - 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)
  - 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.
- Testing
  - JGiven - Provides a fluent API which allows for simpler composition.
  - Hamcrest - Matchers that can be combined to create flexible expressions of intent.
  - Awaitility - DSL for synchronizing asynchronous operations.
  - ConcurrentUnit - Toolkit for testing multi-threaded and asynchronous applications.
  - Hoverfly Java - Native bindings for Hoverfly, a proxy which allows you to simulate HTTP services.
  - Karate - DSL that combines API test-automation, mocks and performance-testing making testing REST/HTTP services easy.
  - REST Assured - DSL for easy testing of REST/HTTP services.
  - WebTau - Test across REST-API, Graph QL, Browser, Database, CLI and Business Logic with consistent set of matchers and concepts.
  - Cucumber - Provides a way to describe features in a plain language which customers can understand.
  - Cukes-REST - Collection of Gherkin steps for REST-service testing using Cucumber.
  - J8Spec - Follows a Jasmine-like syntax.
  - Lamdba Behave - Aims to provide a fluent API to write tests in long and descriptive sentences that read like plain English.
  - 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.
  - Datafaker - Modern fake data generator forked from Java Faker.
  - Fixture Factory - Generates fake objects from a template.
  - 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.
  - JMock - JMock is a high-performance data generation and simulation component library implemented in Java.
  - cdi-test - JUnit extension for easy and efficient testing of CDI components.
  - weld-testing - Set of test framework extensions (JUnit 4, JUnit 5, Spock) to enhance the testing of CDI components via Weld. Supports Weld 5.
  - selenium - Browser automation framework and ecosystem.
  - JsonUnit - Library that simplifies JSON comparison in tests.
  - XMLUnit - Simplifies testing for XML output.
  - ConsoleCaptor - Captures console output for unit testing purposes.
  - junit-dataprovider - TestNG-like data provider/runner for JUnit.
  - LogCaptor - Captures log entries for unit testing purposes.
  - log-capture - Captures log entries and provides assertions for unit and integration testing.
  - Mutability Detector - Reports whether instances of a given class are immutable.
  - raml-tester - Tests if a request/response matches a given RAML definition.
  - Selfie - Snapshot testing (inline and on disk).
  - 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.
  - JMockit - Integration testing, API mocking and faking, and code coverage.
  - Mockito - Mocking framework that lets you write tests with a clean and simple API.
  - Moco - Concise web services for stubs and mocks.
  - PowerMock - Mocks static methods, constructors, final classes and methods, private methods, and removal of static initializers.
  - EasyMock - EasyMock is a Java library that provides an easy way to use Mock Objects in unit testing.
- 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.
- Bytecode Manipulation
  - Perses - Dynamically injects failure/latency at the bytecode level according to principles of chaos engineering.
  - ASM - All-purpose, low-level bytecode manipulation and analysis.
  - 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.
  - Maker - Provides low level bytecode generation.
  - Mixin - Manipulate bytecode at runtime using real Java 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.
  - Selma - Annotation processor-based bean mapper.
  - 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.
- Caching
  - Caffeine - High-performance, near-optimal caching library.
- CLI
  - jbock - Reflectionless command line parser.
  - JLine - Includes features from modern shells like completion or history.
  - Airline - Annotation-based framework for parsing Git-like command-line arguments.
  - 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).
  - Jansi - ANSI escape codes to format console output.
  - Text-IO - Aids the creation of full console-based applications.
  - Lanterna - Easy console text-GUI library, similar to curses. (LGPL-3.0-only)
- Build
  - Bazel - Tool from Google that builds code quickly and reliably.
  - Buck2 - Encourages the creation of small, reusable modules consisting of code and resources.
- 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.
- Compiler-compiler
  - JavaCC - Parser generator that generates top-down parsers. Allows lexical state switching and permits extended BNF specifications.
- Game Development
  - vulkan4j - Vulkan, OpenGL ES2 and GLFW Memory Allocator bindings.
  - JBox2D - Port of the renowned C++ 2D physics engine.
- High Performance
  - fastutil - Fast and compact type-specific collections.
  - JCTools - Concurrency tools currently missing from the JDK.
  - Koloboke - Carefully designed extension of the Java Collections Framework with primitive specializations and more.
- Job Scheduling
  - 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.
  - 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.
  - Quartz - Feature-rich, open source job scheduling library that can be integrated within virtually any Java application.
  - Sundial - Lightweight framework to simply define jobs, define triggers and start the scheduler.
  - Wisp - Simple library with minimal footprint and straightforward API.
  - db-scheduler - Persistent and cluster-friendly scheduler.
- JSON
  - DSL-JSON - JSON library with advanced compile time databinding.
  - Genson - Powerful and easy-to-use Java-to-JSON conversion library.
  - Gson - Serializes objects to JSON and vice versa. Good performance with on-the-fly usage.
  - HikariJSON - High-performance JSON parser, 2x faster than Jackson.
  - jackson-modules-java8 - Set of Jackson modules for Java 8 datatypes and features.
  - 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.
- Machine Learning
  - Intelligent java - Seamlessly integrate with remote deep learning and language models programmatically.
  - 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.
  - Siddhi - Cloud native streaming and complex event processing engine.
  - Smile - Statistical Machine Intelligence and Learning Engine provides a set of machine learning algorithms and a visualization library.
- Miscellaneous
  - JPad - Snippet runner.
  - JBang - JBang makes it easy to use Java for scripting. It lets you use a single file for
  - JBang - JBang makes it easy to use Java for scripting. It lets you use a single file for
  - CQEngine - Ultra-fast, SQL-like queries on Java collections.
  - Design Patterns - Implementation and explanation of the most common design patterns.
  - 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.
  - ISBN core - A small library that contains a representation object of ISBN-10 and ISBN-13 and tools to parse, validate and format one.
  - J2ObjC - Java-to-Objective-C translator for porting Android libraries to iOS.
  - JBot - Framework for building chatbots. (GPL-3.0-only)
  - JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
  - 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.
  - jOOX - Simple wrapper for the org.w3c.dom package, to allow for fluent XML document creation and manipulation with an API inspired by jQuery.
  - jsweet - Source transpiler to TypeScript/JavaScript.
  - Maven Wrapper - Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.
  - MinimalFTP - Lightweight, small and customizable FTP server.
  - 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.
  - 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.
  - RR4J - RR4J is a tool that records java bytecode execution and later allows developers to replay locally.
  - Simple Java Mail - Mailing with a clean and fluent API.
  - 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.
  - 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.
  - yGuard - Obfuscation via renaming and shrinking.
- Networking
  - sshj - Programmatically use SSH, SCP or SFTP.
  - 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)
  - Fluency - High throughput data ingestion logger to Fluentd and Fluent Bit.
  - Undertow - Web server providing both blocking and non-blocking APIs based on NIO. Used as a network layer in WildFly. (LGPL-2.1-only)
  - Commons-networking - Client for server-sent events (SSE).
  - Comsat - Integrates standard Java web-related APIs with Quasar fibers and actors.
  - Dubbo - High-performance RPC framework.
  - gRPC-java - RPC framework based on protobuf and HTTP/2.
  - KryoNet - Provides a clean and simple API for efficient TCP and UDP client/server network communication using NIO and Kryo.
  - Drift - Easy-to-use, annotation-based library for creating Thrift clients and serializable types.
  - ServiceTalk - Framework built on Netty with APIs tailored to specific protocols and support for multiple programming paradigms.
- ORM
  - 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.
  - Hibernate - Robust and widely used, with an active community. (LGPL-2.1-only)
- PaaS
  - AWS Elastic Beanstalk ![c - AWS-based, with support for Tomcat and Jetty.
  - AWS Lambda ![c - Serverless computation.
  - Google Cloud ![c - Google's cloud infrastructure.
  - Microsoft Azure ![c - Microsoft's cloud infrastructure.
- Pathfinding
  - Pathetic - A highly configurable 3D A* pathfinding library that uses specific optimizations for high performance.
- PDF
  - DynamicReports - Simplifies JasperReports. (LGPL-3.0-only)
  - flyingsaucer - XML/XHTML and CSS 2.1 renderer. (LGPL-2.1-or-later)
  - Open HTML to PDF - Properly supports modern PDF standards based on flyingsaucer and Apache PDFBox.
  - OpenPDF - Open-source iText fork. (LGPL-3.0-only & MPL-2.0)
  - Tabula - Extracts tables from PDF files.
- Processes
  - ch.vorburger.exec - Convenient API around Apache Commons Exec.
  - zt-exec - Provides a unified API to Apache Commons Exec and ProcessBuilder.
  - zt-process-killer - Stops processes started from Java or the system processes via PID.
- Reactive libraries
  - Reactive Streams - Provides a standard for asynchronous stream processing with non-blocking backpressure.
  - 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.
- Serialization
  - PHP Serializer - Serializing objects in the PHP serialization format.
  - FlatBuffers - Memory-efficient serialization library that can access serialized data without unpacking and parsing it.
  - FST - JDK-compatible, high-performance object graph serialization.
  - Kryo - Fast and efficient object graph serialization framework.
  - MessagePack - Efficient binary serialization format.
- Web Crawling
  - StormCrawler - SDK for building low-latency and scalable web crawlers.
  - Crawler4j - Simple and lightweight web crawler.
  - webmagic - Scalable crawler with downloading, url management, content extraction and persistent.
- Cloud
  - Google Cloud Client Libraries - Client libraries for accessing Google Cloud services from Java applications.
  - AWS SDK for Java - Provides Java APIs for interacting with Amazon Web Services.
- Performance analysis
  - fastThread ![c - Analyze and visualize thread dumps with a free cloud-based upload interface.
  - GCeasy ![c - Tool to analyze and visualize GC logs. It provides a free cloud-based upload interface.
  - honest-profiler - Low-overhead, bias-free sampling profiler.
  - jHiccup - Logs and records platform JVM stalls.
  - 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.
- Architecture
  - ArchUnit - Test library for specifying and asserting architecture rules.
  - jMolecules - Annotations and interfaces to express design and architecture concepts in code.
- Code Analysis
  - 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.
  - NullAway - Eliminates NullPointerExceptions with low build-time overhead.
  - PMD - Source code analysis for finding bad coding practices.
  - p3c - Provides Alibaba's coding guidelines for PMD, IDEA and Eclipse.
  - RefactorFirst - Identifies and prioritizes God Classes and Highly Coupled classes.
  - 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)
- Computer Vision
  - JavaCV - Java interface to OpenCV, FFmpeg, and much more.
- Distributed Transactions
  - Seata - Delivers high performance and easy to use distributed transaction services under a microservices architecture.
- Document Processing
  - 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.
- 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.
- Formal Verification
  - CATG - Concolic unit testing engine. Automatically generates unit tests using formal methods.
  - Java Path Finder (JPF) - JVM formal verification tool containing a model checker and more. Created by NASA.
- Functional Programming
  - Cyclops - Monad and stream utilities, comprehensions, pattern matching, functional extensions for all JDK collections, future streams, trampolines and much more.
  - derive4j - Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching and morphisms. (GPL-3.0-only)
  - Functional Java - Implements numerous basic and advanced programming abstractions that assist composition-oriented development.
  - 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.
  - StreamEx - Enhances Java 8 Streams.
- GUI
  - SnapKit - Modern Java UI library for both desktop and web.
- HTTP Clients
  - 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.
  - methanol - HTTP client extensions library.
  - Ribbon - Client-side IPC library that is battle-tested in the cloud.
  - Riptide - Client-side response routing for Spring's RestTemplate.
  - unirest-java - Simplified, lightweight HTTP client library.
- Hypermedia Types
  - hate - Builds hypermedia-friendly objects according to HAL specification.
  - JSON-LD - JSON-LD implementation.
  - Siren4J - Library for the Siren specification.
  - Spring HATEOAS - Standalone and Spring support for building hypermedia-based APIs using HAL, HAL FORMS, Collection+JSON, ALPS and UBER.
- IDE
  - IntelliJ IDEA ![c - Supports many JVM languages and provides good options for Android development. The commercial edition targets the enterprise sector.
- Imagery
  - 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.
  - Tess4J - JNA wrapper for Tesseract OCR API.
  - Thumbnailator - High-quality thumbnail generation library.
  - TwelveMonkeys - Collection of plugins that extend the number of supported image file formats.
  - ZXing - Multi-format 1D/2D barcode image processing 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.
  - vips-ffm - Comprehensive bindings for libvips, using Java's "Foreign Function & Memory" API.
- Introspection
  - 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.
- JVM and JDK
  - Dragonwell8 - Downstream version of OpenJDK optimized for online e-commerce, financial, logistics applications.
  - Graal - Polyglot embeddable JVM. (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)
  - Microsoft JDK - Microsoft Build of OpenJDK, Free, Open Source, Freshly Brewed!
- Logging
  - 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.
- Messaging
  - Aeron - Efficient, reliable, unicast and multicast message transport.
  - Deezpatch - Simple, lightweight, and performant dispatch library for decoupling messages (requests and events) and message handlers.
  - EventBus - Simple publish/subscribe event bus.
  - JeroMQ - Implementation of ZeroMQ.
  - Nakadi - Provides a RESTful API on top of Kafka.
  - RabbitMQ Java client - RabbitMQ client.
  - Smack - Cross-platform XMPP client library.
  - NATS client - NATS client.
- Microservice
  - 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.
  - Eureka - REST-based service registry for resilient load balancing and failover.
  - JDA - Wrapping of the Discord REST API and its WebSocket events.
  - 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.
  - Sentinel - Flow control component enabling reliability, resilience and monitoring for microservices.
- Monitoring
  - Apitally - Simple, privacy-focused API monitoring, analytics and request logging for Spring Boot apps.
  - Automon - Combines the power of AOP with monitoring and/or logging tools.
  - Datadog ![c - Modern monitoring & analytics.
  - Dropwizard Metrics - Expose metrics via JMX or HTTP and send them to a database.
  - 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.
  - hippo4j - Dynamic and observable thread pool framework.
  - 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.
  - 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 <b><code> 42446⭐</code></b> <b><code>  4507🍴</code></b> [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.
- Native
  - Aparapi - Converts bytecode to OpenCL which allows execution on GPUs.
  - JavaCPP - Provides efficient and easy access to native C++.
  - 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).
  - native-lib-loader - Native library loader for extracting and loading native libraries from Java.
- Natural Language Processing
  - CogCompNLP - Provides common annotators for plain text input. (Research and Academic Use License)
  - Hypherator - Java hyphenation library with iterator-like interface. Can be used out-of-the box - dictionaries for multiple languages are bundled in.
  - LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.
- Search
  - Indexer4j - Simple and light full text indexing and searching library.
- Security
  - Ayza - High-level SSL configuration builder for configuring HTTP clients and servers with SSL/TLS.
  - DependencyCheck - Detects publicly disclosed vulnerabilities contained within a project's dependencies.
  - 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.
  - 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.
  - Jwks RSA - JSON Web Key Set parser.
  - Kalium - Binding for the Networking and Cryptography (NaCl) library.
  - Keywhiz - System for distributing and managing secrets.
  - Nbvcxz - Advanced password strength estimation.
  - OACC - Provides permission-based authorization services.
  - OpenAM - Access management solution that includes authentication, SSO, authorization, federation, entitlements and web services security.
  - OTP-Java - One-time password generator library according to RFC 4226 (HOTP) and RFC 6238 (TOTP).
  - pac4j - Security engine.
  - Password4j - User-friendly cryptographic library that supports Argon2, Bcrypt, Scrypt, PBKDF2 and various other cryptographic hash functions.
  - 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.
  - Tink - Provides a simple and misuse-proof API for common cryptographic tasks.
- Server
  - nanohttpd - Tiny, easily embeddable HTTP server.
- Template Engine
  - Jade4J - Implementation of Pug (formerly known as Jade).
  - Jamal - Extendable template engine embedded into Maven/JavaDoc, supporting multiple extensions (Groovy, Ruby, JavaScript, JShell, PlantUml) with support for snippet handling.
  - jstachio - Typesafe Mustache templating engine.
  - 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.
- Utility
  - 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.
  - 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.
  - Embulk - Bulk data loader that helps data transfer between various databases, storages, file formats, and cloud services.
  - fswatch - Micro library to watch for directory file system changes, simplifying java.nio.file.WatchService.
  - 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.
  - Javadoc Publisher - Generate Javadoc from your maven/gradle project and deploy it automatically on GitHub Page.
  - JavaVerbalExpressions - Library that helps with constructing difficult regular expressions.
  - JKScope - Java scope functions inspired by Kotlin.
  - 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.
- Version Managers
  - 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.
  - SDKMan - Java Version Manager inspired by RVM and rbenv. Supports UNIX-based platforms and Windows.
- Web Frameworks
  - Blade - Lightweight, modular framework that aims to be elegant and simple.
  - Firefly - Asynchronous framework for rapid development of high-performance web application.
  - 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.
- Workflow Orchestration Engines
  - flowable - Compact and efficient workflow and business process management platform.
Resources
- Related Awesome Lists
- Podcasts and Screencasts
  - The Java Posse - Discontinued as of 02/2015.
Source
- Websites
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