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java-21

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eclipse-collections / eclipse-collections-kata

Star 442

Eclipse Collections Katas

java katas eclipse-collections java-11 java-17 code-katas java-21
  • Updated Mar 31, 2026
  • Java

BNYMellon / CodeKatas

Star 429

Code Kata collection for JVM Languages and Libraries.

kotlin java kata java-streams java-time java-lambda eclipse-collections java-17 java-20 java-21
  • Updated Jan 12, 2026
  • Java

wesleyegberto / java-new-features

Star 365

Exploring Java new features from 8 to 27

java-8 java-9 java-10 java-11 java-12 java-13 java-14 java-15 java-17 java-16 java-18 java-19 java-20 java-21 java-22 java-23 java-24 java-25 java-26 java-27
  • Updated Aug 23, 2026
  • Java

lbalazscs / Pixelitor

Star 263

A desktop image editor

desktop-app windows macos linux image cross-platform photography image-processing image-editor image-manipulation photo photo-editing pixel-editor java-21
  • Updated Aug 1, 2026
  • Java

1chz / realworld-java21-springboot3

Star 193

RealWorld backend API built using Java 21 and Spring Boot 3

h2-database jpa-hibernate java-21 spring-boot-3-2
  • Updated Sep 18, 2025
  • Java

Obydux / Minecraft-startup-flags

Sponsor
Star 133

Modern way of optimizing garbage collection in Minecraft: Java Edition

java minecraft jvm optimization tuning flags zgc java-21 gc-tuning zgenerational generational-zgc java-25
  • Updated Jul 28, 2026

EvenMoreFish / EvenMoreFish

Star 116

An advanced fishing plugin based on MoreFish, created 2 years after its last update.

java minecraft minecraft-plugin paper-plugin java-21 java-25
  • Updated Aug 24, 2026
  • Java

relvaner / actor4j-core

Star 82

Actor4j’s core implementation separates SDK and runtime, enabling flexible execution models.

java microservices actors native actor-model parallelization classic actor graalvm message-passing reactive-system actor4j multi-runtime virtual-threads java-21 actor-bounded thread-bounded
  • Updated Aug 3, 2026
  • Java

giulong / spectrum

Star 60

Modern Selenium framework

java automation framework extentreports selenium test-automation e2e-tests junit test-framework e2e appium automated-testing extent-reports selenium4 e2e-framework appium2 java-21 junit6
  • Updated Aug 24, 2026
  • Java

Rongmario / ImagineBreaker

Sponsor
Star 55

Java 9-25 Hackery, destroys module system + reflection filters

java reflection module hacking java-9 jpms unsafe java-11 java-17 java-21 methodhandles java-24 java-17-lts
  • Updated Aug 24, 2026
  • Java

ronin-engineer-88 / airbnb

Star 50

A homestay booking system like Airbnb. The guideline of a personal project for applying to your CV/resume.

java docker redis spring-boot postgresql postgis-extension java-21
  • Updated Feb 5, 2025
  • Java

artemnefedov / JavaAI

Star 38

Lightweight Java library to interact with the OpenAI API (GPT, DALL-E, TTS, etc.)

tts openai openai-api gpt-4 chat-gpt gpt-api dalle-2 gpt-3-5-turbo java-21 dalle-3
  • Updated Mar 9, 2026
  • Java

luismr / flight-tracker-event-server-java

Star 34

A Spring Boot application for tracking flight events.

java redis postgres kafka spring-boot postgresql swagger swagger-ui openapi-specification openapi3 java-21 java21
  • Updated May 8, 2025
  • Java

LanternPowered / Lmbda

Star 31

A lambda factory.

kotlin java lambda reflection java-8 field java-9 java-11 java-8-lambda lambda-factory fast-reflection field-lambda field-lambda-factory java-17 java-21
  • Updated Jun 19, 2026
  • Java

YuBing-link / noveltrans

Star 31

AI-powered SaaS translation platform for web novels — batch translate with RAG memory, multi-agent collaboration, Stripe billing, Chrome extension & REST API. Java 21 + React 19 + Python.

react chrome-extension translation spring-boot stripe saas multi-agent openai web-novel rag vector-search redis-stack java-21
  • Updated Jun 3, 2026
  • Java

hardikSinghBehl / firebase-integration-spring-boot

Star 31

Spring-boot application integrating with Firestore and Firebase Authentication to build a CRUD application.

firebase-auth firebase-storage firebase-admin-sdk firestore firestore-crud spring-boot-3 spring-security-6 java-21
  • Updated Mar 19, 2024
  • Java

kpavlov / tachyon

Sponsor
Star 30

💫 Tachyon MCP Runtime for Java and Kotlin - Model Context Protocol (MCP) server with Streamable HTTP, native Netty transports, tools, tasks, resources, prompts, completions, resumable sessions, and stateless deployment support.

java ai server netty mcp ai-agents java-21 llm-tools ai-agent-tools model-context-protocol java-25 java-26 ai-agents-mcp
  • Updated Aug 24, 2026
  • Java

FokiDoki / WireRest

Star 30

REST API for Wireguard

java api rest monitoring rest-api prometheus vpn prometheus-exporter swagger-ui restful-api wireguard wireguard-vpn java-21
  • Updated Oct 22, 2024
  • Java

sanchezih / ort-p1

Star 29

Repositorio de la materia Programacion 1

maven oop data-structures java-21
  • Updated Aug 24, 2026
  • Java

Sheldon1999 / E-Commerce-app

Star 26

Sample spring boot microservices application

mysql java docker microservices kafka spring-boot mongodb docker-compose spring-boot-microservices java-21
  • Updated Jun 23, 2025
  • Java

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