IBM User Guide for Java V7 on Windows > Troubleshooting and support > Problem determination > Windows problem determination > Debugging hangs

Getting a dump from a hung JVM

On Windows, the JVM produces a Java™ dump in response to a SIGBREAK signal. You can send this signal using the Ctrl-Break key combination.

You can also configure the JVM to produce a system dump on SIGBREAK by using the -Xdump:system:events=user option. See Using dump agents for details.

If the JVM is not responding to the SIGBREAK signal, you can use the User Mode Process Dumper utility, which is available as a download from www.microsoft.com. Documentation is provided with the utility. Basic usage is as follows

userdump -p

Lists all the processes and their pids.

userdump xxx

Creates a dump file of a process that has a pid of xxx. (processname.dmp file is created in the current directory where userdump.exe is run.)

You can use the dump viewer to examine the system dump produced by this utility. See Using system dumps and the dump viewer for details.

Parent: Debugging hangs

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