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 ★ 1.5k Apache-2.0 🟠
Annotations and interfaces to express design and architecture concepts in code.

jQAssistant ★ 288 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.

Frameworks for building applications with AI, agents and knowledge-based systems.

A2A Java SDK ★ 472 Apache-2.0 🟢
Official Java SDK for the Agent2Agent protocol.

AgentScope Java ★ 5.1k 🟢
Framework for building distributed, long-running AI agents with tool execution, persistence and multi-agent orchestration.

Anahata ASI ★ 23 Apache-2.0 🟢
Java agent container with local LLM adapters, stateful tool execution, context management and IDE integration.

Dokimos ★ 50 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 ★ 391 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 ★ 20 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 ★ 247 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 ★ 381 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 ★ 10.6k Apache-2.0 🟢
Agentic AI framework built on Spring AI with model, tool, RAG and workflow integrations.

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.

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.

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 ★ 25.7k 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 ★ 57 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.

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.

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.

Libraries for everything related to the CLI.

Argument Parsing 5 projects

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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

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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.

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.

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 ★ 390 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 ★ 3.6k Apache-2.0 🟢
Automates large-scale source-code refactoring through reusable recipes.

OpenTaint ★ 128 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)

…превью ограничено; полный список — в репозитории.