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.

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

⚡ 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.

🇮🇳 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.)

Fast 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.

A Spring Boot application for tracking flight events.

A lambda factory.

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

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.