Dump thread information
There's a way of asking a Java Runtime to output a "thread dump" for all currently running threads (both system threads and application threads).
For each thread, the thread dump will include a stack trace, and information on any locks currently held by the thread.
Thread dumps don't cause your application to halt.
They're like a snapshot: your application pauses execution, the running threads are queried,
the information is output, and then your application simply resumes execution.
To cause a thread dump from the console that launched the application:
On Unix, you can also generate a thread dump from any console using these commands:
- on Windows, press Control + Break
- on Unix, press Control + Backslash
- find the application's process id, using
ps x | grep java
kill -3 <java-process-id>
Note that this doesn't actually kill the process.
The precise syntax and content of a thread dump is dependent on the Java Runtime.
Java Mission Control,
Visual VM tools also let you view thread information.
See Also :