java-21

Eclipse Collections Katas

Code Kata collection for JVM Languages and Libraries.

Exploring Java new features from 8 to 28

A desktop image editor

RealWorld backend API built using Java 21 and Spring Boot 3

Modern way of optimizing garbage collection in Minecraft: Java Edition

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

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

Modern Selenium framework

Java 9-28 Hackery, destroys module system + reflection filters

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

⚡ Ultra-Low Latency Continuous Double Auction Matching Engine in Java 21 Loom. In-memory L2 market depth, price-time priority, STOMP WebSockets, 50k+ ops/sec.

⚡ In-Memory Vector Search Engine & HNSW ANN Graph in Java 21 Loom. Sub-millisecond KNN retrieval, 8-bit scalar quantization (SQ8), 16,000+ QPS.

🇮🇳 High-Performance Geospatial Administrative Hierarchy & Proximity Query Engine for India's 650k+ Census Settlements (Java 21 Loom, 2D KD-Tree, 38k+ QPS).

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

A Spring Boot application for tracking flight events.

The fastest dual-era framework-agnostic Model Context Protocol (MCP) runtime for Java and Kotlin. Streamable HTTP, native Netty transports, tools, tasks, resources, prompts, completions, skills over MCP, stateless and stateful with resumable session support.

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.

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

A lambda factory.