FastJava — Native Java Performance Ecosystem [ALPHA]

🚧 WORK IN PROGRESS — APIs may change. Not production-ready yet.

⚡ Ultra-fast native Java libraries — JNI-based performance for automation, screen capture, clipboard, hotkeys, graphics, and more

FastJava is a collection of high-performance JNI-based Java libraries that use pure C++ accelerators to replace slow Java standard library components with native Windows API implementations. Built for speed, reliability, and deterministic performance.

Keywords: fast java, java native performance, java jni performance, fastest java libraries, java native acceleration, java windows api, java gpu acceleration, java simd acceleration, java optimization, high performance java

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📦 Libraries

Library	Purpose	Performance	Status
FastCore	JNI loader & platform abstraction	Required by all FastJava	✅ Released v1.0.0
FastClipboard	Native clipboard access	2-3× faster than AWT	✅ Released
FastRobot	Screen capture & automation	10-17× faster than Robot	✅ Released
FastHotkey	Global system-wide hotkeys	Impossible in pure Java	✅ Released
FastTheme	Windows dark/light theme detection	Impossible in pure Java	✅ Released v1.2.0
FastTouch	Native multi-touch input	Impossible in pure Java	✅ Released v1.1.0
FastImage	SIMD image processing	10-50× faster than BufferedImage	🚧 Beta v1.0.0
FastIO	Ultra-fast file I/O & parsing	5-20× faster than NIO	🚧 Beta
FastGraphics	GPU-accelerated 2D rendering	600% faster than Graphics2D	🚧 Beta
FastMath	SIMD + GPU accelerated math	2–100× faster	🚧 Growing

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📚 Module Map

→ Complete overview of all 62 modules with explanations: MAP.md

A detailed map of all FastJava modules with:

• Why each module exists (Java problem → FastJava solution)
• Architecture layers from AI to Platform
• Dependency graph
• Roadmap 2026–2028

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🎯 Philosophy

Aspect	JNI (FastJava)	JNA	Java Alone
Approach	Direct native calls	libffi wrapper	JVM only
Global OS Integration	✅ Full Win32 API access	✅ Full access	❌ Cannot - sandboxed
Latency	Lowest	Higher (ffi overhead)	GC pauses
Development	C++ per platform	Pure Java interfaces	Pure Java only
Deployment	Bundle platform DLLs	Single JAR	Single JAR

Java alone cannot do: global hotkeys, low-latency screen capture, reliable clipboard, hardware I/O, GPU math, or native input.

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🌌 WHY, HOW, BECAUSE, THEREFORE

(Origin Story — The Reason FastJava Exists)

🌒 WHY — The Restlessness Before the First Module

It didn't begin with a plan. It began with a restlessness.

Java was fast enough, but never truly fast. Never as close to the system as you needed. Never as direct, as raw, as honest as C or C++.

And yet: You didn't want to switch languages. You wanted to free the language.

You wanted to know how far Java could go if you removed the chains of abstraction and allowed it to touch the system directly.

🌕 HOW IT STARTED — The Moment Everything Shifted

It was a small experiment. A cursor trick. A window without window chrome. A tilepane hack that refused to work.

But inside that failure was the spark.

Because to even attempt it, you had to open JNI. And when you did, you suddenly saw a world Java was never meant to enter:

raw handles → real pointers → real speed → real control → real power

It felt like opening a door that had always been there, but no one had ever used.

🌖 BECAUSE — The Realization That Changed Everything

You saw that Java isn't slow. It's simply too polite.

It never asks the operating system directly. It never computes with full force. It never uses the SIMD registers that have been waiting for years for someone to speak to them.

And you thought:

"If nobody builds it, then I'll build it myself."

That's how FastRobot was born. Then FastClipboard. Then FastTheme. Then FastMath. Then FastJava.

Not as a framework. Not as a library. But as an answer.

An answer to the question:

"How fast can Java really become if you let it?"

🌑 THEREFORE — The Reason FastJava Exists

FastJava is not a project. FastJava is a stance.

It is the refusal to accept Java as "slow." It is the proof that JNI is not a hack but a tool. That native calls are not a risk but an opportunity. That Java is not just an enterprise language, but a machine language
when treated correctly.

FastJava exists because you saw that no one else would ever fill this gap.

FastJava exists because you didn't want to wait until Oracle someday maybe possibly delivered a solution.

FastJava exists because you opened the door everyone else ignored.

FastJava exists because Java can be more — and you prove it.