Fast Java Thread
VS Code extension for analyzing JVM thread dumps (.tdump files).
Features
- Tree View Sidebar — Threads grouped by state (RUNNABLE, BLOCKED, WAITING, etc.) with counts and icons
- Dashboard — Pie chart of thread states, top 10 hot methods, deadlock alerts
- Click-to-Navigate — Click a thread in the tree to jump to its location in the dump file
- Deadlock Detection — Automatic cycle detection in lock wait graphs
- Java 8 & 11+ Support — Parses both formats (with and without
cpu=/elapsed= fields)
Usage
- Open a
.tdump file in VS Code
- The tree view populates automatically in the Fast Java Thread sidebar
- Right-click in the editor and select Analyze Thread Dump for full analysis
- Run Fast Java Thread: Show Dashboard from the command palette for the webview dashboard
Commands
| Command |
Description |
Fast Java Thread: Analyze Thread Dump |
Parse the active .tdump file and populate the tree view |
Fast Java Thread: Show Dashboard |
Open the webview dashboard with charts and deadlock alerts |
Development
npm install
npm run compile
npm test
Press F5 in VS Code to launch the Extension Development Host.
The extension expects .tdump files containing standard JVM thread dump output, as produced by jstack, kill -3, or JMX ThreadMXBean.dumpAllThreads().
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