Awesome Java

Byte Code Engineering Library - analyze, create, and manipulate Java class files.

Easy-to-use wrappers around the Java reflection and introspection APIs.

Redesign of Commons BeanUtils.

Bean Scripting Framework - interface to scripting languages, including JSR-223.

Find Class interfaces, methods, fields, and annotations without loading.

Command-line arguments parser.

Redesign of Commons CLI.

General encoding/decoding algorithms, e.g. phonetic, base64 or URL.

Extends or augments the Java Collections Framework.

Defines an API for working with tar, zip and bzip2 files.

Reading of configuration/preferences files in various formats.

Commons-Convert aims to provide a single library dedicated to the task of converting an object of one type to another.

Component for reading and writing comma separated value files.

Alternative invocation mechanism for unix-daemon-like java code.

Database connection pooling services.

JDBC helper library.

XML-to-Java-object mapping utility.

Library for sending e-mail from Java.

API for dealing with external process execution and environment management in Java.

File upload capability for your servlets and web applications.

Java library inspired by the UNIX find command.

Java library for working with flat data structures.

General purpose graph APIs and algorithms.

Adds the feature of localized message bundles that consist of one or many localized texts that belong together.

Id is a component used to generate identifiers.

Image library.

Collection of I/O utilities.

Continuation implementation to capture the state of the application.

Java Compiler Interface.

Java Caching System.

XML based scripting and processing engine.

Expression language which extends the Expression Language of the JSTL.

JNet allows to use dynamically register url stream handlers through the java.net API.

Utilities for manipulating Java Beans using the XPath syntax.

Provides extra functionality for classes in java.lang.

Wrapper around a variety of logging API implementations.

Lightweight, self-contained mathematics and statistics components.

Monitoring aims to provide a simple but extensible monitoring solution for Java applications.

Nabla provides automatic differentiation classes that can generate derivative of any function implemented in the Java language.

Collection of network utilities and protocol implementations.

Interface to signing and verifying data using OpenPGP.

Small framework for microbenchmark clients, with implementations for Commons DBCP and Pool.

Provides a set of pipeline utilities designed around work queues that run in parallel to sequentially process data objects.

Generic object pooling component.

Common implementation of RDF 1.1 that could be implemented by systems on the JVM.

Commons Rng provides implementations of pseudo-random numbers generators.

Implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.

Framework to define validators and validation rules in an xml file.

Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.

Provides an easy way to enhance (weave) compiled bytecode.

Test library for specifying and asserting architecture rules.

Annotations and interfaces to express design and architecture concepts in code.

Annotation-based framework for parsing Git-like command-line arguments.

Reflectionless command line parser.

Command-line argument-parsing framework with custom types and validation via implementing interfaces.

Includes features from modern shells like completion or history.

ANSI colors and styles in usage help with annotation-based POSIX/GNU/any syntax, subcommands, strong typing for both options and positional args.

Java agent container with local LLM adapters, stateful tool execution, context management and IDE integration.

Evaluation framework for LLM and AI-agent applications that scores responses, validates tool calls and execution traces, and catches quality regressions in CI.

Agent runtime with a Java SDK for building AI agents, supporting graph-based workflow orchestration, multi-agent coordination, and MCP/A2A protocols.

Simplifies integration of LLMs with unified APIs and a comprehensive toolbox.

Provides a Java binding for a unified LLM API client across multiple providers.

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.

Google ADK plugin suite that adds runtime compliance profiles, audit envelopes and GRC adapters for regulated Java AI agents.

Library to use the OpenAI API (and compatible ones) in the simplest possible way.

Application framework for AI engineering for Spring.

DSL for synchronizing asynchronous operations.

Toolkit for testing multi-threaded and asynchronous applications.

In-memory email server for integration testing. Supports SMTP, POP3 and IMAP including SSL. (GPL-2.0-only)

Native bindings for Hoverfly, a proxy which allows you to simulate HTTP services.

DSL that combines API test-automation, mocks and performance-testing making testing REST/HTTP services easy.

DSL for easy testing of REST/HTTP services.

Test across REST-API, Graph QL, Browser, Database, CLI and Business Logic with consistent set of matchers and concepts.

Provides a way to describe features in a plain language which customers can understand.

Collection of Gherkin steps for REST-service testing using Cucumber.

Follows a Jasmine-like syntax.

Extensively configurable framework that describes stories.

Provides a fluent API which allows for simpler composition.

Code-first BDD framework for Java and Kotlin that generates interactive HTML reports and sequence diagrams from test code.

Aims to provide a fluent API to write tests in long and descriptive sentences that read like plain English.

Automated Acceptance testing and reporting library that works with Cucumber, JBehave and JUnit to make it easier to write high quality executable specifications.

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.

Annotation processor that generates type-safe mapper implementations for Java Records using canonical constructors, with zero runtime reflection.

Uses byte code manipulation for lightning-fast mapping. Supports annotations and API or XML configuration.

Code generator that simplifies mappings between different bean types, based on a convention-over-configuration approach.

Intelligent object mapping library that automatically maps objects to each other.

JavaBean-mapping framework that recursively copies (among other capabilities) data from one object to another.

Lambda and method handle-based mapping which requires code and not annotations if objects have different names.

Annotation processor-based bean mapper.

Declarative build and dependency management that favors convention over configuration. It might be preferable to Apache Ant, which uses a rather procedural approach and can be difficult to maintain.

Tool from Google that builds code quickly and reliably.

Encourages the creation of small, reusable modules consisting of code and resources.

Incremental builds programmed via Groovy instead of declaring XML. Works well with Maven's dependency management.

A modern, zero-configuration package manager and runner for the Java ecosystem written in Go, focusing on developer productivity and build speed.

Dependency health checker for pom.xml and Gradle projects that scans for CVEs and outdated packages.

All-purpose, low-level bytecode manipulation and analysis.

Further simplifies bytecode generation with a fluent API.

Java 8 Jar & Android APK reverse engineering suite. (GPL-3.0-only)

Manipulate bytecode at runtime via DSL (rules); mainly for testing/troubleshooting. (LGPL-2.1-or-later)

Bytecode generation library.

Tries to simplify bytecode editing.

Provides low level bytecode generation.

Manipulate bytecode at runtime using real Java code.

Dynamically injects failure/latency at the bytecode level according to principles of chaos engineering.

JVM reverse engineering toolkit, essentially an IDE for Java bytecode.

Performance-optimized, dependency-free and RFC 4180 compliant.

Jackson extension for reading and writing CSV.

Simple CSV parser.

Powerful CSV parser with support for Dozer, Joda-Time and Java 8.

One of the fastest and most feature-complete parsers. Also comes with parsers for TSV and fixed-width records.

In-memory high performance caching library.

High-performance, near-optimal caching library.

Distributed general-purpose cache.

Highly concurrent key/value datastore used for caching.

Provides Java APIs for interacting with Amazon Web Services.

Client libraries for accessing Google Cloud services from Java applications.

Static analysis of coding conventions and standards. (LGPL-2.1-or-later)

Catches common programming mistakes as compile-time errors.

Error Prone extensions: extra bug checkers and a large battery of Refaster templates.

Modern static analysis tool for verifying the correctness of code.

Static code analysis with Neo4J-based query language. (GPL-3.0-only)

Eliminates NullPointerExceptions with low build-time overhead.

Provides Alibaba's coding guidelines for PMD, IDEA and Eclipse.

Source code analysis for finding bad coding practices.

Identifies and prioritizes God Classes and Highly Coupled classes.

Static analyzer for SonarQube & SonarLint. (LGPL-3.0-only)

Library for analyzing and transforming Java source code.

Static analysis of bytecode to find potential bugs. (LGPL-2.1-only)

Online Java code analyzer and JSON-to-Mermaid visualization tool.

Relies on source-code instrumentation instead of bytecode instrumentation.

Relies on offline (or static) bytecode instrumentation and class loading to collect code coverage metrics. (GPL-2.0-only)

Computes code coverage of new and modified code based on a provided diff, supporting JaCoCo and IntelliJ coverage engines.

Framework that enables collection of code coverage metrics, using both offline and runtime bytecode instrumentation.

Reformats Java source code to follow Google Java Style.

Safely reorders Java source code with configurable rules and Palantir Java Format.

Formatter based on google-java-format with wider lines and lambda-friendly output.

JSR-269 code generator for algebraic data types.

Generates factory, service, and value classes.

Generates Lightweight JAX-RS style http servers using Javalin or Helidon (Nima) SE.

Compile-time annotation processor generating CRUD layers, DTOs, JSON Patch, and custom HTTP endpoints for Spring Boot.

Annotation processor for automatic DTO and Mapper generation with zero boilerplate.

Automatically generates the Builder pattern.

Discovers files that need generated code, updates automatically and writes to the source with a convenient API.

Annotation processors to generate simple, safe and consistent value objects.

API to generate source files.

Yeoman source code generator for Spring Boot and AngularJS.

Small framework that adds queryable properties to Java, enhancing JavaBeans.

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.

Code generator that aims to reduce verbosity.

Companion builder class, withers and templates for Java records.

Maven plugin for generating Spring Boot CRUD applications from YAML/JSON specifications.

Simple and light code generator available as an Eclipse Plugin and also as a CLI.

Subreddit for the Java community.

Question/answer platform.

Complex full-featured framework for top-down parsing.

Parser generator that generates top-down parsers. Allows lexical state switching and permits extended BNF specifications.

Lexical analyzer generator.

Library for image processing, camera calibration, tracking, SFM, MVS, 3D vision, QR Code and much more.

Medical image processing application with an API.

Java interface to OpenCV, FFmpeg, and much more.

Loads yaml and properties files, supports dynamic configuration, plugins, file-watching and config event listeners.

Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2.

Type-safe, composable configuration library with a focus on runtime clarity.

Configuration library supporting Java properties, JSON or its human optimized superset HOCON.

Configuration library with support for various configuration formats and transformations.

High-level API for Apache ZooKeeper.

Twelve-factor configuration library which uses environment-specific files.

Simple, lightweight, yet powerful configuration library which supports resolution of properties from external sources such as files, databases, git repositories, and any custom sources, plus an extensible post-processing/conversion mechanism.

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.

Provides an API for handling Windows' INI files.

Annotation-based configuration system for Java and Kotlin.

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.

Reduces boilerplate of properties.

Encrypts environment files with a shared Node.js and Java/Spring Boot format plus optional TOTP unsealing.

Off-the-shelf constraint satisfaction problem solver that uses constraint programming techniques.

Includes an interface for the FlatZinc language, enabling it to execute MiniZinc models. (AGPL-3.0)

Business planning and resource scheduling optimization solver.

Flexible solver with Spring/Quarkus support and quickstarts for the Vehicle Routing Problem, Maintenance Scheduling, Employee Shift Scheduling and much more.

Data interchange format with dynamic typing, untagged data, and absence of manually assigned IDs.

Fast and efficient columnar storage format for Hadoop-based workloads.

Columnar storage format based on assembly algorithms from Google's paper on Dremel.

Data interchange format that originated at Facebook.

Fast and persistent queue based on memory-mapped files.

Hash map and set implementations using SwissTable-style SWAR/SIMD control-byte probing, optimized for memory efficiency.

Persistent and immutable analogue of the Java Collections Framework.

Google's data interchange format.

Fast and efficient compressed bitmap.

Simple Binary Encoding, one of the fastest message formats around.

Lightning-fast, transactional, file-based FIFO.

Clean, lightweight protocol buffers.

High-performance sorted map with fast range scans and thread-safe concurrent access, based on the Wormhole index structure.

Generates PostgreSQL schema DDL from Liquibase migrations using Testcontainers.

Dynamic data management framework. It contains many of the pieces that comprise a typical database management system.

Distributed, schema on-the-fly, ANSI SQL query engine for Big Data exploration.

High-performance relational database layer over HBase for low-latency applications.

Distributed SQL transaction & query engine that allows for data sharding, scaling, encryption, and more on any database.

ArangoDB Java driver.

Multi-model database supporting graphs, documents, key-value, time series, and vector embeddings with SQL, Cypher, Gremlin, MongoDB, and Redis API compatibility.

Efficient, in-memory (opt. persisted to disk), off-heap key-value store.

Universal, flexible, high-performance distributed ID generator.

Low latency data streaming platform for change data capture.

High-performance, column-oriented, distributed data store.

NoSQL document database and application platform. (LGPL-2.1-only)

Brings metrics and failover strategies to the most common connection pooling solutions.

Simple database migration tool.

Small SQL database notable for its in-memory functionality.

High-performance JDBC connection pool.

HyperSQL 100% Java database.

Convenient abstraction of JDBC.

Small client for interaction with Redis, with methods for commands.

Client for the Elasticsearch REST API.

Client library for etcd.

Typesafe database queries via symbolic execution of Java 8 Lambdas (on top of JPA or jOOQ).

Generates typesafe code based on SQL schema.

Distributed ID generate service.

Lettuce is a scalable Redis client for building non-blocking Reactive applications.

Database-independent library for tracking, managing and applying database schema changes.

Embedded database engine that provides concurrent collections backed on disk or in off-heap memory.

Launcher for MariaDB that requires no installation or external dependencies.

Lightweight ORM with database reverse engineering features.

Type 3 JDBC driver and Layer 7 proxy server for decoupling applications from relational database connection management.

LDAPv3 compliant directory service, developed for the Java platform, providing a high performance, highly available, and secure store for the identities.

Typesafe unified queries.

Build JPA Criteria queries using a Stream-like API.

High-performance SQL database for time series. Supports InfluxDB line protocol, PostgreSQL wire protocol, and REST.

Mobile database to run directly inside phones, tablets or wearables.

Allows for distributed and scalable data structures on top of a Redis server.

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.

Discovers, documents and diagrams relational database schemas from Java, build tools and the command line.

Database access library that utilizes Java 8's Stream API for querying.

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.

Allows you to use MongoDB query language to query your relational database.

Distributed SQL query engine for big data.

JDBC connection pool library with advanced performance monitoring capabilities.

Highly concurrent transactional schema-less and ACID-compliant embedded database.

Parse and build iCalendar RFC 5545 data models.

Determines the holidays for a given year, country/name and eventually state/region.

Additional date-time classes that complement those in JDK 8.

Advanced date and time library. (LGPL-2.1-only)

Implementation of the Tron Protocol, whic utilizes blockchains to develop decentralized applications.

Java decompiler focused on modern language features.

Java decompiler with broad JVM bytecode support.

Core Java decompiler library.

Java decompiler and metadata toolkit.

Unified API that exposes multiple decompilers through one in-memory transformation interface.

Modern maintained fork of Fernflower.

CDI extension framework.

Microservice-focused compile-time injection framework without reflection.

Compile-time injection framework without reflection.

JSR-330 runtime dependency injection using the JDK Class-File API.

Ultra-lightweight, JSR-330-compliant dependency injection library.

Extensions and utilities that enhance Google Guice.

Lightweight and opinionated framework that completes Dagger.

Lightweight and dynamic dependency injection framework.

Lightweight dependency injection framework. (LGPL-3.0-only)

Seamless aspect-oriented programming extension.

JVM modification that allows unlimited redefinition of loaded classes at runtime. (GPL-2.0-only)

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.

Unlimited runtime class and resource redefinition. (GPL-2.0-only)

Parse, modify and generate Java code.

Symbol solver.

Re-energizes Java with powerful features like type-safe metaprogramming, structural typing and extension methods.

Allows checked exceptions in functional interfaces and converts exceptions to Optional return.

Ignores checked exceptions without bytecode manipulation. Can also be used inside Java 8 stream operations.

Enable infinite recursion using tail call optimization.

In-memory data management system that provides reliable asynchronous event notifications and guaranteed message delivery.

Realtime computation system.

Coordination service with distributed configuration, synchronization, and naming registry for large distributed systems.

Fault-tolerant distributed coordination framework.

Framework for creating CQRS applications.

Circuit breaker design pattern for Dropwizard. (GPL-2.0-only)

Simple failure handling with retries and circuit breakers.

Highly scalable in-memory datagrid with a free open-source version.

Toolkit for reliable messaging and cluster creation.

High-performance reverse proxy server with specialized session management and credential replay functionality.

Lightweight threads and actors for the JVM.

Functional fault tolerance library.

Embeddable Cluster-Membership library based on SWIM and gossip protocol.

Gateway service that provides dynamic routing, monitoring, resiliency, security, and more.

Provides transactions for REST, SOA and microservices with support for JTA and XA.

Simple but complete implementation of the JTA 1.1 API.

Provides support for traditional ACID and compensation transactions, also complies with JTA, JTS and other standards. (LGPL-2.1-only)

Delivers high performance and easy to use distributed transaction services under a microservices architecture.

Binary artifact management toolkit which hosts them on the file system or S3.

Simple and powerful packaging and deployment. A fat JAR on steroids, or a "Docker for Java" that supports JVM-optimized containers.

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.

System for deploying Java applications to end-user computers and keeping them up to date. Developed as an alternative to Java Web Start.

Setup authoring tool for cross-platform deployments.

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.

Deploy desktop apps as native Mac, Windows or Linux bundles.

Builds optimized runtimes over HTTP.

Installs and runs Java applications from Maven repositories, reusing descriptors and provisioning required JDKs.

Packs JARs, assets and the JVM for native distribution on Windows, Linux and macOS.

Maven plugin for making self-executing JARs.

Supports OOXML (XLSX, DOCX, PPTX) as well as OLE2 (XLS, DOC or PPT).

API for document format conversion using third-party converters such as MS Word.

Create and manipulate Microsoft Open XML files.

High performance library to read and write large Excel (XLSX) worksheets.

Converts HTML to CommonMark-compatible Markdown through a Java binding.

Jackson dataformat module for reading and writing Excel (XLSX/XLS) as POJOs via ObjectMapper.

Reads and writes Excel, CSV and ODS files with annotation mapping, streaming, styling and validation.

Extracts text, tables and metadata from PDFs, Office documents, images and other formats through a Java binding.

Annotation-based API for reading data from Excel sheets into POJOs with focus on reduced overhead.

Trading bot framework.

Platform for trading venues.

Low-latency financial information exchange.

Integration with the Square API.

Integration with the Stripe API.

Library for technical analysis.

Technical-analysis library with 514 streaming O(1)-per-tick indicators on a native Rust core, on Maven Central as org.wickra:wickra; more indicators and incremental updates than the pure-Java ta4j.

Supports generating test data or combining scenarios for parameterized tests.

Sets up beans from YAML fixtures.

Modern fake data generator forked from Java Faker.

Generates fake objects from a template.

Automates data setup in unit tests by generating fully-populated, reproducible objects. Includes JUnit 5 extension.

Port of Ruby's fake data generator.

Fake data generator.

JMock is a high-performance data generation and simulation component library implemented in Java.

Another fake data generator.

JUnit test runner and plugins for running JUnit tests with pseudo-randomness.

Maps flat files of fixed-length or delimited records to and from Java beans using XML or annotation configuration.

Annotation-driven mapping of fixed-width flat files to and from POJOs and Java records.

Parses and writes delimited and fixed-length flat files with optional column-mapping definitions.

Concolic unit testing engine. Automatically generates unit tests using formal methods.

Pluggable type systems. Includes nullness types, physical units, immutability types and more. (GPL-2.0-only WITH Classpath-exception-2.0)

Detects likely program invariants and generates JML specs based on those invariants.

JVM formal verification tool containing a model checker and more. Created by NASA.

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)

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)

Translates JML specifications into SMT-LIB format and passes the proof problems implied by the program to backend solvers. (GPL-2.0-only)

Functional testing and performance measurements.

Integration and functional testing platform for Java EE containers.

JUnit extension for easy and efficient testing of CDI components.

Integration testing framework that focuses on both client- and server-side messaging.

Load testing tool designed for ease of use, maintainability and high performance.

Load tests with JMeter as simple as a JUnit test.

Engine for property-based testing built on JUnit 5.

Common testing framework.

Consumer-driven contract testing.

Fast mutation-testing framework for evaluating fault-detection abilities of existing JUnit or TestNG test suites.

Browser automation framework and ecosystem.

Zero-boilerplate Selenium + TestNG framework with auto driver management, smart retry, self-healing locators, AI failure analysis, and a built-in HTML report.

Set of test framework extensions (JUnit 4, JUnit 5, Spock) to enhance the testing of CDI components via Weld. Supports Weld 5.

Monad and stream utilities, comprehensions, pattern matching, functional extensions for all JDK collections, future streams, trampolines and much more.

Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching and morphisms. (GPL-3.0-only)

Functional extensions to Guava.

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

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.

Gatherers library for Java Stream API. Gatherers can enhance streams with custom intermediate operations.

Stream API Collectors for parallel processing with custom thread pools, designed for I/O-heavy workloads.

Collection of stream utilities.

Enhances Java 8 Streams.

Functional component library that provides persistent data types and functional control structures.

Modern Swing Look and Feel with Darcula and IntelliJ themes.

Successor of Swing.

Visual layout tool for JavaFX applications.

Lightwieght declarative DSL for rapid development of Swing applications.

Modern Java UI library for both desktop and web.

Graphical widget toolkit.

JavaFX Game Development Framework.

Lightweight, cross-platform library for gamepad and joystick input handling.

Port of the renowned C++ 2D physics engine.

Game engine for modern 3D development.

All-round cross-platform, high-level framework.

AWT-based, lightweight 2D game engine.

Robust framework that abstracts libraries like OpenGL/CL/AL.

Beginner-friendly, master-ready framework for rapidly prototyping and building 2D games.

Vulkan, OpenGL ES2 and GLFW Memory Allocator bindings.

Library for developing geospatial applications.

GeoHash utilities in Java.

Library that provides tools for geospatial data. (LGPL-2.1-only)

Road-routing engine. Used as a Java library or standalone web service.

Spatial extension of the H2 database. (LGPL-3.0-only)

Library for using the GeoHash algorithm.

Map rendering based on OpenStreetMap data. (LGPL-3.0-only)

General-purpose spatial/geospatial library.

Toolset of low-level Java components focused on HTTP and associated protocols.

Asynchronous HTTP and WebSocket client library.

Wrapper on JDK 11's HttpClient that adds Feign-like interface among other enhancements.

HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket.

Pluggable HTTP transport abstraction with support for java.net.HttpURLConnection, Apache HTTP Client, Android, Google App Engine, XML, Gson, Jackson and Protobuf.

Executes HTTP requests from cURL syntax through annotations, XML configuration and dynamic proxy clients.

HTTP client extensions library.

Typesafe REST client.

Client-side IPC library that is battle-tested in the cloud.

Client-side response routing for Spring's RestTemplate.

Simplified, lightweight HTTP client library.

Data structures and utility methods that are common in high-performance applications.

Inter-thread messaging library.

Collections framework inspired by Smalltalk.

Fast and compact type-specific collections.

Primitive collections.

Concurrency tools currently missing from the JDK.

Carefully designed extension of the Java Collections Framework with primitive specializations and more.

Builds hypermedia-friendly objects according to HAL specification.

JSON-LD implementation.

Library for the Siren specification.

Standalone and Spring support for building hypermedia-based APIs using HAL, HAL FORMS, Collection+JSON, ALPS and UBER.

Established open-source project with support for lots of plugins and languages.

Created to provide software visualizations that work in conjunction with the debugger such as Control Structure Diagrams, UML class diagrams and Object Viewer.

Provides integration for several Java SE and EE features, from database access to HTML5.

Modern IDE for Java running in the browser, focused on education.

Provides Java support for lightweight projects with a simple, modern workflow by using extensions from the internal marketplace.

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.

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.

Simple, efficient and hardware-accelerated image-scaling library implemented in pure Java 2D.

Immutable, functional, and performant JVM library for manipulation of images.

JNA wrapper for Tesseract OCR API.

High-quality thumbnail generation library.

Collection of plugins that extend the number of supported image file formats.

Comprehensive bindings for libvips, using Java's "Foreign Function & Memory" API.

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

ClassGraph (formerly FastClasspathScanner) is an uber-fast, ultra-lightweight, parallelized classpath scanner and module scanner for Java, Scala, Kotlin and other JVM languages.

jOOR stands for jOOR Object Oriented Reflection. It is a simple wrapper for the java.lang.reflect package.

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.

Allows dynamic instantiation without default constructor, e.g. constructors which have required arguments, side effects or throw exceptions.

ReflectASM is a very small Java library that provides high performance reflection by using code generation.

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.

Reflection-free Json binding via source code generation with Jackson-like annotations.

JSON library with advanced compile time databinding.

Very fast processor with no additional dependencies and full data binding.

Powerful and easy-to-use Java-to-JSON conversion library.

Serializes objects to JSON and vice versa. Good performance with on-the-fly usage.

High-performance JSON parser, 2x faster than Jackson.

Similar to GSON, but offers performance gains if you need to instantiate the library more often.

Open-source Jackson module to support JSON serialization and deserialization of JavaMoney data types.

Set of Jackson modules for Java 8 datatypes and features.

JSON to JSON transformation tool.

Convert Java to JSON/TOON and back. Supports complex object graphs, cyclic references, and TOON format for 40-50% LLM token savings.

Fast and flexible library with iterator and lazy parsing API.

Extract data from JSON using XPATH-like syntax.

Streaming JsonPath processor dedicated to processing big and complicated JSON data.

JSON parsing and serializing library based on Jackson's streaming API. Outperforms GSON & Jackson's library.

Modern JSON library, less opinionated and uses built-in types like List and Map.

Binding layer between classes and JSON documents similar to JAXB.

Community-driven OpenJDK builds, including both HotSpot and OpenJ9.

No-cost, multiplatform, production-ready distribution of OpenJDK by Amazon. (GPL-2.0-only WITH Classpath-exception-2.0)

Downstream version of OpenJDK optimized for online e-commerce, financial, logistics applications.

Polyglot embeddable JVM. (GPL-2.0-only WITH Classpath-exception-2.0)

Built from OpenJDK, thoroughly tested and passed the JCK. (GPL-2.0-only WITH Classpath-exception-2.0)

Microsoft Build of OpenJDK, Free, Open Source, Freshly Brewed!

Open JDK community home. (GPL-2.0-only WITH Classpath-exception-2.0)

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.

VM with non-blocking, concurrent GC for iOS. (GPL-2.0-only WITH Classpath-exception-2.0)

RedHat's OpenJDK distribution. (GPL-2.0-only WITH Classpath-exception-2.0)

SAP's no-cost, rigorously tested and JCK-verified OpenJDK friendly fork. (GPL-2.0-only WITH Classpath-exception-2.0)

Overview of common JVMs with pros and cons.

OpenJDK builds for Windows, Linux, and macOS. (GPL-2.0-only WITH Classpath-exception-2.0)

Persistent and cluster-friendly scheduler.

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.

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.

Feature-rich, open source job scheduling library that can be integrated within virtually any Java application.

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.

Lightweight framework to simply define jobs, define triggers and start the scheduler.

Simple library with minimal footprint and straightforward API.

Complete rewrite with a powerful plugin and configuration architecture.

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.

Flogger is a fluent logging API for Java. It supports a wide variety of features, and has many benefits over existing logging APIs.

Open-source aggregator suited for extended role and permission management. (GPL-3.0-only)

Analyzes and visualizes log files. Some features require payment.

Robust logging library with interesting configuration options via Groovy.

Extensible, open-source library for HTTP request and response logging.

Tool for managing log files.

Collection of libraries that build on top of OpenTracing and provide extensions and plugins to existing instrumentations.

Enables logging for all JDBC transactions without changes to the code.

Abstraction layer/simple logging facade.

Lightweight logging framework with static logger class.

Fast, reliable, large-scale data processing engine.

Scalable algorithms focused on collaborative filtering, clustering and classification.

Provides several algorithms and pre-trained models for natural language processing.

Distributed and multi-threaded deep learning library.

High-level and engine-agnostic framework for deep learning.

Seamlessly integrate with remote deep learning and language models programmatically.

Algorithms for pre-processing, classification, regression, and clustering with support for multi-threaded execution. (GPL-3.0-only)

CLI tool to transpile models into native code.

A lightweight, platform independent, OpenCL accelerated nd-array/tensor library.

High-performance mathematics, linear algebra and optimisation needed for data science, machine learning and scientific computing.

Framework for building real-time, large-scale machine learning applications. Includes end-to-end applications for collaborative filtering, classification, regression, and clustering.

Cloud native streaming and complex event processing engine.

Implements scikit-learn-style machine learning algorithms in pure Java.

Statistical Machine Intelligence and Learning Engine provides a set of machine learning algorithms and a visualization library.

Provides tools for classification, regression, clustering, model development and interfaces with other libraries such as scikit-learn, pytorch and TensorFlow.

Collection of algorithms for data mining tasks ranging from pre-processing to visualization. (GPL-3.0-only)

Fluent assertions that improve readability.

Matchers that can be combined to create flexible expressions of intent.

Simplifies testing JSON strings.

Library that simplifies JSON comparison in tests.

Google's fluent assertion and proposition framework.

Simplifies testing for XML output.

Efficient, reliable, unicast and multicast message transport.

Message broker that implements JMS and converts synchronous to asynchronous communication.

Glues together different transport APIs via Enterprise Integration Patterns.

High-throughput distributed messaging system.

Distributed pub/sub-messaging system.

Apache Qpid makes messaging tools that speak AMQP and support many languages and platforms.

Fast, reliable, and scalable distributed messaging platform.

AutoMQ is a cloud-native, serverless reinvented Kafka that is easily scalable, manage-less and cost-effective.

Simple, lightweight, yet FAST messaging library for decoupling messages (requests and events) and message handlers.

Simple publish/subscribe event bus.

Fast and reliable message broker built on top of Kafka.

Implementation of ZeroMQ.

Provides a RESTful API on top of Kafka.

NATS client.

RabbitMQ client.

Cross-platform XMPP client library.

Lightweight and fast library for complex high-load distributed applications and Memcached-like solutions.

Asynchronous RPC/REST client/server library built on top of Java 8, Netty, HTTP/2, Thrift and gRPC.

Client for the Consul API: a distributed, highly available and datacenter-aware registry/discovery service.

REST-based service registry for resilient load balancing and failover.

Two-style approach for writing microservices: Functional-reactive and as an implementation of MicroProfile.

Wrapping of the Discord REST API and its WebSocket events.

Client provides access to the full Kubernetes & OpenShift REST APIs via a fluent DSL.

Modern full-stack framework with focus on modularity, minimal memory footprint and startup time.

Dynamic service discovery, configuration and service management platform for building cloud native applications.

Java libraries for using OpenAI's GPT-3 API.

Kubernetes stack tailored for the HotSpot and Graal VM.

Flow control component enabling reliability, resilience and monitoring for microservices.

Captures console output for unit testing purposes.

Ultra-fast, SQL-like queries on Java collections.

Implementation and explanation of the most common design patterns.

Feature Flags for Java.

No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes. (No explicit license)

Wrapper for the IP2Location.io Geolocation API and the IP2WHOIS domain WHOIS API.

A small library that contains a representation object of ISBN-10 and ISBN-13 and tools to parse, validate and format one.

Java-to-Objective-C translator for porting Android libraries to iOS.

Side-by-side comparisons of legacy and modern Java patterns.

Static website generator.

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.

Framework for building chatbots. (GPL-3.0-only)

JCuda offers Java bindings for CUDA and CUDA-related libraries.

An auto-generated emoji library that provides type-safe direct access to emojis and alias support for Discord, Slack, GitHub and many more features.

In-memory file system.

Basic currency and money classes and algorithms not provided by the JDK.

Simple wrapper for the org.w3c.dom package, to allow for fluent XML document creation and manipulation with an API inspired by jQuery.

Snippet runner.

Java-like scripting language for dynamic rule engines with XML orchestration and Java interoperability.

Source transpiler to TypeScript/JavaScript.

TestNG-like data provider/runner for JUnit.

JUnit 5 extension pack, pushing the frontiers on Jupiter.

High performance HTTP proxy atop Netty's event-based networking library.

Captures log entries and provides assertions for unit and integration testing.

Captures log entries for unit testing purposes.

Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.

Open-source, reverse-proxy framework.

Lightweight, small and customizable FTP server.

Popular Java 8 guide.

Detect uses of legacy Java APIs.

Reports whether instances of a given class are immutable.

Reactive, type-safe framework for Telegram bots based on Spring Boot 3 and Java 21.

Browser extension which allows to navigate through code on GitHub more efficiently.

Tool for working with messy data: cleaning, transforming, extending it with web services and linking it to databases.

Small utility library for using handlers and commands with pipelines.

Automatically performs tests on basic POJO methods. (LGPL-3.0-only)

Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.

Tests if a request/response matches a given RAML definition.

Cloud-managed feature flag platform with a Java SDK, supporting gradual rollouts, A/B testing, and real-time updates.

RR4J is a tool that records java bytecode execution and later allows developers to replay locally.

Snapshot testing (inline and on disk).

Mailing with a clean and fluent API.

Real-time test execution control via Google Spreadsheet, enabling instant toggle without code changes.

Framework for fragment-based message processing. (Apache-2.0 OR LGPL-3.0-or-later)

Multi-approach framework for test steps managing.

Library for the Svix API to send webhooks and verify signatures.

Maven plugin providing Vitest-inspired watch mode for tests with smart selection and parallel execution.

Provides throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Implementation of the Feature Toggles pattern.

Tools for resolving generic types.

Library for using built-in and external webcams directly in Java.

Processes XML by using annotations or XPath within code.

Obfuscation via renaming and shrinking.

Cross-platform solution for writing native mobile apps. (GPL-2.0-only WITH Classpath-exception-2.0)

Cross-platform framework for developing mobile apps with native UI in Java and Kotlin.

Open-source, cross-platform engine to develop native mobile (iOS, Android, etc.) apps.

EasyMock is a Java library that provides an easy way to use Mock Objects in unit testing.

Integration testing, API mocking and faking, and code coverage.

Mocking framework that lets you write tests with a clean and simple API.

Allows mocking of systems integrated with HTTPS.

Concise web services for stubs and mocks.

Mocks static methods, constructors, final classes and methods, private methods, and removal of static initializers.

Stubs and mocks web services.

Simple, privacy-focused API monitoring, analytics and request logging for Spring Boot apps.

Combines the power of AOP with monitoring and/or logging tools.

Spring Boot Actuator extension providing application startup and runtime metrics including JVM uptime, memory usage, and CPU load.

Expose metrics via JMX or HTTP and send them to a database.

Out of the box monitoring of Failsafe Circuit Breaker in Spring-Boot environment.

Open-source Java APM.

Real-time monitoring system with custom-monitor and agentless.

Dynamic and observable thread pool framework.

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.

Jaeger client.

Performance monitoring and profiling.

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.

JMX over REST.

Vendor-neutral metrics/observability facade for the most popular metrics/observability libraries.

Vendor-neutral distributed tracing facade for the most popular tracer libraries.

Remote developer console from the browser for Java 8 via bytecode injection.

Instrument, generate, collect, and export telemetry data to help you analyze your software’s performance and behavior.

Open-source APM tool.

Provides a multi-dimensional data model, DSL, autonomous server nodes and much more.

, an application error tracking and performance analysis platform.

Open-source performance monitoring and transaction tracing for JVM apps.

Lightweight platform monitoring tool for Java VMs.

Distributed tracing system which gathers timing data needed to troubleshoot latency problems in microservice architectures.

Converts bytecode to OpenCL which allows execution on GPUs.

Provides efficient and easy access to native C++.

Work with native libraries without writing JNI. Also provides interfaces to common system libraries.

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.

Native library loader for extracting and loading native libraries from Java.

Provides common annotators for plain text input. (Research and Academic Use License)

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

Collection of reusable NLP tools for linguistic pre-processing, machine learning, lexical resources, etc.

Java hyphenation library with iterator-like interface. Can be used out-of-the box - dictionaries for multiple languages are bundled in.

Toolkit for tasks ranging from POS tagging to sentiment analysis.

Client for server-sent events (SSE).

Integrates standard Java web-related APIs with Quasar fibers and actors.

Easy-to-use, annotation-based library for creating Thrift clients and serializable types.

High-performance RPC framework.

High throughput data ingestion logger to Fluentd and Fluent Bit.

NIO framework. Used as a network layer in Glassfish.

RPC framework based on protobuf and HTTP/2.

Java wrapper for ngrok; programmatic tunnels for ingress, webhooks, demos, and APIs.

Provides a clean and simple API for efficient TCP and UDP client/server network communication using NIO and Kryo.

Abstract, event-driven async I/O API for network operations over TCP/IP and UDP/IP via Java NIO.

Framework for building high-performance network applications.

Framework built on Netty with APIs tailored to specific protocols and support for multiple programming paradigms.

Programmatically use SSH, SCP or SFTP.

Implements a ByteChannel interface over SSLEngine, enabling easy-to-use (socket-like) TLS.

Web server providing both blocking and non-blocking APIs based on NIO. Used as a network layer in WildFly. (LGPL-2.1-only)

Represent, parse and encode URNs, as in RFC 2141. (GPL-3.0-only)

Provides a clean, static API for data access. Also includes a GUI Modeler for working with database mappings, and DB reverse engineering and generation.

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.

Provides simple and fast data access.

Supports a number of persistence standards: JPA, JAXB, JCA and SDO.

Robust and widely used, with an active community. (LGPL-2.1-only)

Couples objects with stored procedures or SQL statements.

Code-first dynamic ORM for MyBatis with runtime schema modification.

A powerful enhanced toolkit of MyBatis for simplifying development.

ActiveRecord ORM for rapid development and convention over configuration.

Language-natural persistence layer.

Simple database and CSV mapper.

High-level framework for developing enterprise applications with a rich web interface, based on Spring, EclipseLink and Vaadin.

Fast, lightweight and productive microservices framework with built-in security.

Open-source business application platform for rapid configuration/development of CRM, ERP, LMS and other applications.

Provides many packages for dependency injection, aspect-oriented programming, security, etc.

Creates PDFs from XSL-FO.

Toolbox for creating and manipulating PDFs.

Abstraction layer to JasperReports. (LGPL-3.0-only)

Simplifies JasperReports. (LGPL-3.0-only)

Report engine for creating PDF and other formats (DOCX, XLSX, HTML, etc) using Eclipse-based visual editor.

XML/XHTML and CSS 2.1 renderer. (LGPL-2.1-or-later)

Declarative engine for structured business PDFs with semantic layout, atomic pagination, theme tokens, and native vector charts.

Complex reporting engine. (LGPL-3.0-only)

Generates PDFs from HTML-like templates and ECharts-style charts using iText 7, without a browser dependency.

Properly supports modern PDF standards based on flyingsaucer and Apache PDFBox.

Open-source iText fork. (LGPL-3.0-only & MPL-2.0)

Extracts tables from PDF files.

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

JVM diagnostics CLI for jcmd, JFR, async-profiler, heap analysis and machine-readable health verdicts.

Memory leak diagnostics that orchestrates jcmd, jmap, jstat, JFR, Eclipse MAT, and async-profiler into a structured investigation workflow with confidence-based verdicts.

Low-overhead, bias-free sampling profiler.

Logs and records platform JVM stalls.

Analyze the JIT compiler optimisations made by the HotSpot JVM.

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)

Java agent for line-level execution frequency analysis to identify algorithmic bottlenecks.

Utilities for latency measurement and reporting.

Short videos on Twitter explaining Java debugging in depth.

(Official)

Discontinued as of 02/2015.

Convenient API around Apache Commons Exec.

Provides a unified API to Apache Commons Exec and ProcessBuilder.

Stops processes started from Java or the system processes via PID.

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.

Opinionated framework for setting up modern web applications with Jetty, Jackson, Jersey and Metrics.

Opinionated framework for JSON- or GraphQL-APIs based on a JPA data model.

JAX-RS reference implementation.

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.

Spring Boot add-on that adds explicit function orchestration to REST endpoints, with each endpoint's steps, branches and error flows in one YAML file whose directory path maps to the URL.

Allows generation of API client libraries, SDKs, server stubs, documentation and configuration automatically given an OpenAPI Spec.

Simple, secure and extremely fast framework consisting of an embedded HTTP server, GUI components and dependency injection.

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.

Fully certified and portable implementation of the JAX-RS specification.

Thin wrapper on the JBoss Netty HTTP stack that provides scaling and performance.

Pioneering framework with powerful routing and filtering capabilities, and a unified client and server API.

Sinatra inspired framework.

Automates the generation of API documentation using Spring Boot projects.

Standard, language-agnostic interface to REST APIs.

Toolkit and runtime for building concurrent, distributed, fault-tolerant and event-driven applications.

Provides a standard for asynchronous stream processing with non-blocking backpressure.

A framework for building non-blocking applications on the JVM, providing support for reactive programming.

Allows for composing asynchronous and event-based programs using observable sequences.

Polyglot event-driven application framework.

Facilitates processing biological data by providing algorithms, file format parsers, sequencing and 3D visualization commonly used in bioinformatics.

Scientific charting library with focus on performance optimised real-time data visualisation at 25 Hz update rates for large data sets.

Environment for scientific computation, data analysis and data visualization. (GPL-3.0-or-later)

Modular, light and easy graph framework for theoretic algorithms.

Library for modeling and analyzing dynamic graphs.

2D chart library for Swing, JavaFX and server-side applications. (LGPL-2.1-only)

Graph library that provides mathematical graph-theory objects and algorithms.

Library for visualizing (mainly Swing) and interacting with node-edge graphs.

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.

Library for creating, manipulating and solving Boolean and Pseudo-Boolean formulas.

Library for geophysical scientific computation, visualization and digital signal analysis.

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.

A low level space flight dynamics library providing basic elements (orbits, dates, attitude, frames...) and various algorithms (conversions, propagations, pointing...) to handle them.

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)

Includes a data-frame, an embedded column store, and hundreds of methods to transform, summarize, or filter data.

Light-weight library for plotting data. Many customizable chart types are available.

High-performance, full-featured, cross-platform, text search engine library.

Enterprise search engine optimized for high-volume traffic.

Distributed, multitenant-capable, full-text search engine with a RESTful web interface and schema-free JSON documents.

Simple and light full text indexing and searching library.

Performs authentication, authorization, cryptography and session management.

High-level SSL configuration builder for configuring HTTP clients and servers with SSL/TLS.

All-purpose cryptographic library and JCA provider offering a wide range of functions, from basic helpers to PGP/SMIME operations.

CLI tool and library for extracting and exporting server certificates from HTTPS endpoints.

Multiplatform, transparent, client-side encryption of files in the cloud. (GPL-3.0-only)

Detects publicly disclosed vulnerabilities contained within a project's dependencies.

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.

JSON web token for Java and Android.

JSON Web Key Set parser.

Easily create and parse JSON Web Tokens and create customized JWT validators using a fluent API.

Binding for the Networking and Cryptography (NaCl) library.

Integrated SSO and IDM for browser apps and RESTful web services.

System for distributing and managing secrets.

Cryptographic signing for AI agents using ML-DSA-44 post-quantum signatures, creating audit trails for attribution and compliance.

Advanced password strength estimation.

Provides permission-based authorization services.

Access management solution that includes authentication, SSO, authorization, federation, entitlements and web services security.

One-time password generator library according to RFC 4226 (HOTP) and RFC 6238 (TOTP).

Security engine.

Enforce password policy by validating candidate passwords against a configurable rule set.

User-friendly cryptographic library that supports Argon2, Bcrypt, Scrypt, PBKDF2 and various other cryptographic hash functions.

Fluent Builder API for JCA and JSSE classes and especially X.509 certificates.

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.

Provides a simple and misuse-proof API for common cryptographic tasks.

Fine-grained authorization for applications with support for RBAC, ABAC, and ReBAC.

Memory-efficient serialization library that can access serialized data without unpacking and parsing it.

JDK-compatible, high-performance object graph serialization.

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

Fast and efficient object graph serialization framework.

Efficient binary serialization format.

Serializing objects in the PHP serialization format.

Robust, all-round server for Servlet and JSP.

Tomcat plus Java EE.

Provides a Web server and javax.servlet container, plus support for HTTP/2, WebSocket, OSGi, JMX, JNDI, JAAS and many other integrations.

Tiny, easily embeddable HTTP server.

Formerly known as JBoss and developed by Red Hat with extensive Java EE support. (LGPL-2.1-only)

Freelance author, JavaOne Rockstar speaker, consultant, Java Champion.

Performance geek, benchmarking czar, concurrency bug hunter.

Java Champion, JUG Leader, Devoxx France, Java EE 6/7, JCP, Author.

Java Champion, JavaOne Rockstar, JUG Leader, Devoxx4Kids-er, VP of Developer Advocacy at Couchbase.

Java Language Architect at Oracle.

Product Manager/Java Jock at Oracle.

Open Source Enthusiast, Speaker, Developer, Developer Advocacy at TimescaleDB.

Software architect, consultant, and serial entrepreneur, Java Champion, JavaOne Rock Star, \POJOs in Action- author.

Consulting Member of the Technical Staff at Oracle.

Author of the Spring Security Course.

Java Champion, speaker, author of The Java Specialists' Newsletter, concurrency performance expert.

Technical Lead of IBM London's Bluemix Garage, Java Champion, developer, author, JavaOne rockstar.

Java/JavaFX/IoT developer, author and speaker.

Official Java Twitter account.

Well-known Java blogger.

Spring Advocate at Pivotal, author of O'Reilly's Cloud Native Java- and Building Microservices with Spring Boot, JavaOne Rock Star.

Java Champion, speaker, Founder and CEO Data Geekery (jOOQ).

Java champion, Polyglot, Software Crafter involved with @graalvm, AI/ML/DL, Data Science, Developer communities, speaker & blogger. Creator of couple of awesome lists like this one.

RedHatter, JUG coordinator, frequent speaker and author.