Awesome Java 
A curated list of noteworthy Java frameworks, libraries, tools and resources.
818 projects · 80 categories · 85 resources
Activity: 🟢 pushed within 3 months · 🟠 pushed 3–12 months ago · 🔴 no push for over 12 months
License chips use GitHub SPDX metadata when available.
Entries spanning several repositories combine their stars, use the most recent push for activity and show a license only when all repositories agree.
Projects
Architecture 5 projects
Frameworks and libraries that help implementing and verifying design and architecture concepts.
ArchUnit ★ 3.8k Apache-2.0 🟢
Test library for specifying and asserting architecture rules.
jMolecules ★ 1.6k Apache-2.0 🟠
Annotations and interfaces to express design and architecture concepts in code.
jQAssistant ★ 289 GPL-3.0 🟢
Static code analysis with Neo4J-based query language.
Taikai ★ 250 MIT 🟢
ArchUnit extension with predefined architecture rules for common Java technologies.
WireDoctor ★ 7 Apache-2.0 🟢
Runtime diagnostic for Spring Boot apps that detects cyclic bean dependencies and slow beans, with CI regression gates.
Artificial Intelligence 15 projects
Frameworks for building applications with AI, agents and knowledge-based systems.
A2A Java SDK ★ 479 Apache-2.0 🟢
Official Java SDK for the Agent2Agent protocol.
AgentScope Java ★ 5.2k 🟢
Framework for building distributed, long-running AI agents with tool execution, persistence and multi-agent orchestration.
Anahata ASI ★ 26 Apache-2.0 🟢
Java agent container with local LLM adapters, stateful tool execution, context management and IDE integration.
Dokimos ★ 52 MIT 🟢
Evaluation framework for LLM and AI-agent applications that scores responses, validates tool calls and execution traces, and catches quality regressions in CI.
Google Gen AI Java SDK ★ 392 Apache-2.0 🟢
Official Java SDK for integrating Google generative AI models.
JADE
Framework and environment for building and debugging multi-agent systems. (LGPL-2.0-only)
JamJet ★ 21 Apache-2.0 🟢
Agent runtime with a Java SDK for building AI agents, supporting graph-based workflow orchestration, multi-agent coordination, and MCP/A2A protocols.
LangChain4j ★ 12.9k Apache-2.0 🟢
Simplifies integration of LLMs with unified APIs and a comprehensive toolbox.
liter-llm ★ 249 MIT 🟢
Provides a Java binding for a unified LLM API client across multiple providers.
MCP Java SDK ★ 3.7k MIT 🟢
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.
Protégé ★ 1.5k 🟠
Provides an ontology editor and a framework to build knowledge-based systems.
Regulus ★ 6 MIT 🟢
Google ADK plugin suite that adds runtime compliance profiles, audit envelopes and GRC adapters for regulated Java AI agents.
simple-openai ★ 382 MIT 🟠
Library to use the OpenAI API (and compatible ones) in the simplest possible way.
Spring AI ★ 9.3k Apache-2.0 🟢
Application framework for AI engineering for Spring.
Spring AI Alibaba ★ 10.7k Apache-2.0 🟢
Agentic AI framework built on Spring AI with model, tool, RAG and workflow integrations.
Bean Mapping 4 projects
Frameworks that ease bean mapping.
Immuto ★ 6 🟢
Annotation processor that generates type-safe mapper implementations for Java Records using canonical constructors, with zero runtime reflection.
MapStruct ★ 7.7k 🟢
Code generator that simplifies mappings between different bean types, based on a convention-over-configuration approach.
ModelMapper ★ 2.4k Apache-2.0 🟠
Intelligent object mapping library that automatically maps objects to each other.
reMap ★ 128 Apache-2.0 🟢
Lambda and method handle-based mapping which requires code and not annotations if objects have different names.
Bot Development 4 projects
Libraries and frameworks for building chatbots and messaging-platform bots.
JBot ★ 1.2k GPL-3.0 🟠
Framework for building chatbots.
JDA ★ 4.7k Apache-2.0 🟢
Wrapping of the Discord REST API and its WebSocket events.
Nyagram ★ 9 MIT 🟢
Reactive, type-safe framework for Telegram bots based on Spring Boot 3 and Java 21.
TelegramBots ★ 5.5k MIT 🟢
Java library for building bots with the Telegram Bot API.
Build 16 projects
Tools that handle the build cycle and dependencies of an application.
Apache Maven ★ 5.3k Apache-2.0 🟢
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.
Bazel ★ 25.8k Apache-2.0 🟢
Tool from Google that builds code quickly and reliably.
Buck2 ★ 4.4k Apache-2.0 🟢
Encourages the creation of small, reusable modules consisting of code and resources.
Dependency Analysis Gradle Plugin ★ 2.2k Apache-2.0 🟢
Analyzes JVM and Android builds and recommends dependency and plugin changes.
Docker Maven Plugin ★ 1.9k Apache-2.0 🟢
Builds and runs Docker images from Maven.
Eclipse JKube ★ 851 EPL-2.0 🟢
Maven and Gradle plugins for building and deploying Java applications on Kubernetes.
Frontend Maven Plugin ★ 4.4k Apache-2.0 🟢
Installs and runs Node.js frontend tooling from Maven builds.
git-commit-id Maven Plugin ★ 1.7k LGPL-3.0 🟢
Exposes Git revision information to Maven builds and applications.
Gradle ★ 18.8k Apache-2.0 🟢
Incremental builds programmed via Groovy instead of declaring XML. Works well with Maven's dependency management.
jar-cart ★ 4 MIT 🟢
A modern, zero-configuration package manager and runner for the Java ecosystem written in Go, focusing on developer productivity and build speed.
Javadoc Publisher ★ 58 Apache-2.0 🟠
Generate Javadoc from your maven/gradle project and deploy it automatically on GitHub Page.
Jib ★ 14.4k Apache-2.0 🟢
Builds optimized container images for Java applications without a Docker daemon.
Maven Wrapper ★ 253 Apache-2.0 🟢
Analogue of Gradle Wrapper for Maven, allowing projects to build without a preinstalled Maven.
Polyglot for Maven ★ 922 EPL-1.0 🟢
Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.
ReleaseRun ★ 1 MIT 🟠
Dependency health checker for pom.xml and Gradle projects that scans for CVEs and outdated packages.
Shadow ★ 4.2k Apache-2.0 🟢
Gradle plugin for creating and transforming executable fat JARs.
Bytecode Manipulation 7 projects
Libraries to manipulate bytecode programmatically.
ASM
All-purpose, low-level bytecode manipulation and analysis.
Byte Buddy ★ 6.9k Apache-2.0 🟢
Further simplifies bytecode generation with a fluent API.
bytecode-viewer ★ 15.6k GPL-3.0 🟢
Java 8 Jar & Android APK reverse engineering suite.
Byteman ★ 514 🟢
Manipulate bytecode at runtime via DSL (rules); mainly for testing/troubleshooting. (LGPL-2.1-or-later)
Javassist ★ 4.2k 🟢
Tries to simplify bytecode editing.
Maker ★ 72 Apache-2.0 🟢
Provides low level bytecode generation.
Recaf ★ 7.3k MIT 🟢
JVM reverse engineering toolkit, essentially an IDE for Java bytecode.
Caching 5 projects
Libraries that provide caching facilities.
cache2k ★ 742 Apache-2.0 🔴
In-memory high performance caching library.
Caffeine ★ 17.8k Apache-2.0 🟢
High-performance, near-optimal caching library.
Ehcache ★ 2.1k Apache-2.0 🟠
Distributed general-purpose cache.
Infinispan ★ 1.3k Apache-2.0 🟢
Highly concurrent key/value datastore used for caching.
JetCache ★ 5.6k Apache-2.0 🟢
Java cache framework with local and distributed caching, annotations and asynchronous APIs.
CLI 9 projects
Libraries for everything related to the CLI.
Argument Parsing 5 projects
Libraries to assist with parsing command line arguments.
Airline ★ 145 Apache-2.0 🟢
Annotation-based framework for parsing Git-like command-line arguments.
jbock ★ 94 MIT 🟢
Reflectionless command line parser.
JCommander ★ 2.0k Apache-2.0 🟠
Command-line argument-parsing framework with custom types and validation via implementing interfaces.
JLine ★ 1.8k 🟢
Includes features from modern shells like completion or history.
picocli ★ 5.4k Apache-2.0 🟢
ANSI colors and styles in usage help with annotation-based POSIX/GNU/any syntax, subcommands, strong typing for both options and positional args.
Text-Based User Interfaces 4 projects
Libraries that provide TUI frameworks, or building blocks related functions.
AliveJTUI ★ 9 🟠
Declarative, React-style TUI library for building terminal UIs as component trees with diff-based rendering, focus management, and themes.
Jansi ★ 1.2k Apache-2.0 🟠
ANSI escape codes to format console output.
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.
Lanterna ★ 2.6k LGPL-3.0 🟢
Easy console text-GUI library, similar to curses.
Cloud 6 projects
Libraries to integrate or use cloud-specific features.
AWS SDK for Java 2.x ★ 2.6k Apache-2.0 🟢
Official Java APIs for interacting with Amazon Web Services.
Google Cloud Client Libraries ★ 2.1k Apache-2.0 🟢
Client libraries for accessing Google Cloud services from Java applications.
Java Operator SDK ★ 938 Apache-2.0 🟢
SDK for implementing Kubernetes operators in Java.
Kubernetes Java Client ★ 4.0k Apache-2.0 🟢
Official Java client for the Kubernetes API.
kubernetes-client ★ 3.7k Apache-2.0 🟢
Client provides access to the full Kubernetes & OpenShift REST APIs via a fluent DSL.
minio-java ★ 1.3k Apache-2.0 🟢
Provides simple APIs to access any Amazon S3-compatible object storage server.
Code Analysis 16 projects
Tools that provide metrics and quality measurements.
Checkstyle ★ 9.0k LGPL-2.1 🟢
Static analysis of coding conventions and standards.
Error Prone ★ 7.2k Apache-2.0 🟢
Catches common programming mistakes as compile-time errors.
Error Prone Support ★ 38 MIT 🟢
Error Prone extensions: extra bug checkers and a large battery of Refaster templates.
Infer ★ 15.7k MIT 🟢
Modern static analysis tool for verifying the correctness of code.
JSpecify ★ 1.1k Apache-2.0 🟢
Standardized nullness annotations designed to work uniformly across various Java IDEs, compilers, and static analysis tools.
Modernizer ★ 391 Apache-2.0 🟢
Detect uses of legacy Java APIs.
Mutability Detector ★ 246 Apache-2.0 🟠
Reports whether instances of a given class are immutable.
NullAway ★ 4.1k MIT 🟢
Eliminates NullPointerExceptions with low build-time overhead.
OpenRewrite ★ 3.7k Apache-2.0 🟢
Automates large-scale source-code refactoring through reusable recipes.
OpenTaint ★ 144 Apache-2.0 🟢
Interprocedural taint analyzer for Java and Spring applications with reusable security rules and dependency models.
PMD ★ 5.5k 🟢
Source code analysis for finding bad coding practices.
RefactorFirst ★ 542 Apache-2.0 🟢
Identifies and prioritizes God Classes and Highly Coupled classes.
SonarJava ★ 1.2k 🟢
Static analyzer for SonarQube & SonarLint. (LGPL-3.0-only)
Spoon ★ 2.0k 🟢
Library for analyzing and transforming Java source code.
Spotbugs ★ 3.9k LGPL-2.1 🟢
Static analysis of bytecode to find potential bugs.
ToolsHref ★ 0 🟠
Online Java code analyzer and JSON-to-Mermaid visualization tool.
Code Coverage 3 projects
Frameworks and tools that enable code coverage metrics collection for test suites.
Delta Coverage ★ 41 MIT 🟢
Computes code coverage of new and modified code based on a provided diff, supporting JaCoCo and IntelliJ coverage engines.
JaCoCo ★ 4.6k 🟢
Framework that enables collection of code coverage metrics, using both offline and runtime bytecode instrumentation.
OpenClover ★ 70 🟢
Measures Java code coverage through source-code instrumentation, with build-tool and IDE integrations.
Code Formatting 4 projects
Tools that format or restructure Java source code.
**google-java-format
A curated list of frameworks, libraries, tools and resources for the Java programming language, organized into categories like AI, build tools, caching, CLI, bytecode manipulation and more.