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56 stars written in Java
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Spring Framework

Java 59,852 38,859 Updated Apr 16, 2026

Learn System Design concepts and prepare for interviews using free resources.

Java 36,433 7,892 Updated Feb 16, 2026

Open Source Identity and Access Management For Modern Applications and Services

Java 33,923 8,253 Updated Apr 17, 2026

Apache Kafka - A distributed event streaming platform

Java 32,388 15,119 Updated Apr 16, 2026

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Java 26,116 7,491 Updated Apr 17, 2026

A Java serialization/deserialization library to convert Java Objects into JSON and back

Java 24,244 4,425 Updated Apr 17, 2026

Awesome LeetCode resources to learn Data Structures and Algorithms and prepare for Coding Interviews.

Java 16,255 3,470 Updated Nov 25, 2025

Most popular Mocking framework for unit tests written in Java

Java 15,428 2,652 Updated Apr 16, 2026

Very spicy additions to the Java programming language.

Java 13,436 2,475 Updated Apr 7, 2026

A scalable web crawler framework for Java.

Java 11,691 4,143 Updated Dec 20, 2025

LangChain4j is an open-source Java library that simplifies the integration of LLMs into Java applications through a unified API, providing access to popular LLMs and vector databases. It makes impl…

Java 11,639 2,139 Updated Apr 16, 2026

Flyway by Redgate • Database Migrations Made Easy.

Java 9,691 1,604 Updated Apr 14, 2026

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Java 8,630 1,825 Updated Apr 16, 2026

An annotation processor for generating type-safe bean mappers

Java 7,644 1,015 Updated Apr 12, 2026

✅ The programmer-friendly testing framework for Java and the JVM

Java 6,998 1,667 Updated Apr 16, 2026

Main Liquibase Source

Java 5,485 1,939 Updated Apr 16, 2026

Non-Blocking Reactive Foundation for the JVM

Java 5,217 1,243 Updated Apr 16, 2026

Unified Queries for Java

Java 4,964 875 Updated Apr 13, 2026

Solutions to LeetCode problems; updated daily. Subscribe to my YouTube channel for more.

Java 3,986 1,295 Updated Oct 13, 2025

Framework for Evolutionary Message-Driven Microservices on the JVM

Java 3,575 840 Updated Apr 16, 2026

Contains latest company wise questions of LeetCode as of Feb 2026.

Java 3,573 797 Updated Feb 21, 2026

High Performance data structures and utility methods for Java

Java 3,179 434 Updated Apr 16, 2026

Ultra-fast matching engine written in Java based on LMAX Disruptor, Eclipse Collections, Real Logic Agrona, OpenHFT, LZ4 Java, and Adaptive Radix Trees.

Java 2,479 952 Updated Oct 8, 2023

We do Open Source ERP - Fast, Flexible & Free Software to scale your Business.

Java 2,299 770 Updated Apr 17, 2026

Elasticsearch File System Crawler (FS Crawler)

Java 1,441 305 Updated Apr 15, 2026

A game server reimplementation for a certain turn-based anime game

Java 1,381 264 Updated Oct 21, 2024

Prettier Java Plugin

Java 1,203 114 Updated Apr 15, 2026

A modern, lambda-friendly, 120 character Java formatter.

Java 788 83 Updated Apr 17, 2026

An example of Choreography-based sagas in Spring Boot/JPA microservices

Java 706 309 Updated Apr 1, 2026

UUID Creator is a Java library for generating Universally Unique Identifiers. It generates all standard identifiers from UUIDv1 to UUIDv7. It also provides an alternative to the classic JDK's UUID …

Java 663 52 Updated Apr 13, 2025
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