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161 stars written in Java
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Design patterns implemented in Java

Java 93,858 27,367 Updated Mar 20, 2026

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

Java 26,062 7,461 Updated Apr 2, 2026

FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.

Java 23,591 802 Updated Jul 15, 2024

JDK main-line development https://openjdk.org/projects/jdk

Java 22,718 6,295 Updated Apr 4, 2026

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

Java 21,544 1,786 Updated Apr 4, 2026

High Performance Inter-Thread Messaging Library

Java 18,281 3,963 Updated Apr 2, 2025

Change data capture for a variety of databases. Please log issues at https://github.com/debezium/dbz/issues.

Java 12,580 2,901 Updated Apr 3, 2026

A collection of source code generators for Java.

Java 10,555 1,212 Updated Apr 3, 2026

Test Automation Made Simple

Java 8,828 2,023 Updated Apr 3, 2026

Catch common Java mistakes as compile-time errors

Java 7,151 786 Updated Apr 2, 2026

Runtime code generation for the Java virtual machine.

Java 6,795 845 Updated Apr 1, 2026

Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java

Java 6,235 2,578 Updated Apr 3, 2026

Apache Kafka® running on Kubernetes

Java 5,761 1,471 Updated Apr 4, 2026

Open source version of Google Authenticator (except the Android app)

Java 5,329 991 Updated Sep 28, 2020

This is the new home of the original DDD Sample app (previously hosted at sf.net)..

Java 5,268 1,515 Updated Jun 2, 2025

Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector)

Java 4,635 994 Updated Dec 6, 2025

Fault tolerance and resilience patterns for the JVM

Java 4,308 309 Updated Dec 28, 2025

The source code from the third edition of Effective Java, with minor additions as necessary to make it runnable.

Java 4,015 1,977 Updated Oct 28, 2020

These are the sample Bounded Contexts from the book "Implementing Domain-Driven Design" by Vaughn Vernon: http://vaughnvernon.co/?page_id=168

Java 3,922 921 Updated Sep 9, 2023

High performance non-blocking webserver

Java 3,744 1,054 Updated Mar 24, 2026

Example code for the book Microservice patterns

Java 3,696 1,404 Updated Mar 13, 2026

Google Reader inspired self-hosted personal RSS reader.

Java 3,494 397 Updated Apr 4, 2026

WildFly Application Server

Java 3,159 2,253 Updated Apr 4, 2026

Bouncy Castle Java Distribution (Mirror)

Java 2,631 1,235 Updated Mar 4, 2026

Java EE 7 Samples

Java 2,511 1,642 Updated Sep 1, 2022

XML/XHTML and CSS 2.1 renderer in pure Java

Java 2,214 575 Updated Apr 1, 2026

Speedment is a Stream ORM Java Toolkit and Runtime

Java 2,096 232 Updated Nov 7, 2023

Maven plugin for running and creating Docker images

Java 1,929 655 Updated Apr 1, 2026

Concise UI Tests with Java!

Java 1,908 599 Updated Apr 2, 2026

Exercises and Answers for Java 8 Lambdas book

Java 1,840 1,252 Updated Oct 27, 2023
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