Fast Java Thread

Cross-platform desktop application for analyzing Java thread dumps. Built with Tauri v2 and TypeScript.

Download

Pre-built binaries for Windows, macOS, and Linux are available on the Releases page.

Features

• Open thread dump files (.tdump, .txt, .log) or drag-and-drop
• Thread state distribution chart (pie chart)
• Hot methods analysis
• Deadlock detection with cycle visualization
• Collapsible sidebar grouped by thread state
• Thread detail view with full stack trace
• Dark / Light theme toggle
• MCP server with 5 analysis tools for AI assistant integration
• Configurable MCP settings (transport, port, authentication)
• Fully offline — no network access, no telemetry

Screenshots

MCP Integration

The app includes a built-in Model Context Protocol server that lets AI assistants analyze thread dumps directly.

Available tools

Tool	Description
analyze_thread_dump	Full analysis: thread states, hot methods, deadlocks
detect_deadlocks	Find deadlock cycles with lock chain details
get_hot_methods	Most frequent methods across all stack traces
get_thread_summary	Thread count, state breakdown, JVM version
find_threads_by_method	Search threads by method name or regex

Usage

1. Click the MCP button in the toolbar to start the server
2. Configure transport and port in Settings (gear icon)
3. Connect your MCP client (e.g. Claude Code) to localhost:3100 (HTTP) or via stdio

For stdio mode, run the server directly:

npm run mcp:build
node lib/FastJavaThread/out/src/mcp/server.js

Note: MCP server requires Node.js 20+ installed on your machine.

Prerequisites

Windows

• Microsoft Visual Studio C++ Build Tools
• WebView2 (pre-installed on Windows 10+)
• Rust
• Node.js 20+

macOS

• Xcode Command Line Tools (xcode-select --install)
• Rust
• Node.js 20+

Linux

• System packages:

  sudo apt install libwebkit2gtk-4.1-dev libgtk-3-dev libappindicator3-dev librsvg2-dev patchelf

• Rust
• Node.js 20+

Getting Started

git clone --recurse-submodules https://github.com/martin5211/FastJavaThread-app.git
cd FastJavaThread-app
npm install
npm run dev        # development mode with hot reload
npm run build      # production build
npm test           # run tests

Build Output

Platform	Artifacts
Windows	src-tauri/target/release/bundle/msi/*.msi, src-tauri/target/release/bundle/nsis/*.exe
macOS	src-tauri/target/release/bundle/dmg/*.dmg
Linux	src-tauri/target/release/bundle/deb/*.deb, src-tauri/target/release/bundle/appimage/*.AppImage

Architecture

The core parsing logic lives in the FastJavaThread git submodule at lib/FastJavaThread/. The desktop app imports directly from the submodule.

License

Eclipse Public License - v 2.0