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Thread Dumps

Java 5 tools

This should work on any Java 5 or newer platform.

$ jps
3392 Jps
3387 JConsole



$ jstack 3387
Attaching to process ID 3387, please wait...
Debugger attached successfully.
Client compiler detected.
JVM version is 1.5.0_16-133
Thread t@59139: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- javax.swing.TimerQueue.run() @bci=14, line=236 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)

OS signals

In the case of an OS signal the thread dump is printed to the console window that started the java process. If you use javaw to start the process, the dump is lost.

On Windows, typing ctrl-break in the console window that started the Java process. On Unix, the command kill -QUIT <pid> or typing ctrl-\ in the console window that started the Java process.