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

Debugging hangs

Hangs refer to the JVM locking up or refusing to respond.

A hang can occur when:

• Your application entered an infinite loop.
• A deadlock has occurred

To determine which of these situations applies, open the Windows Task Manager and select the Performance tab. If the CPU time is 100% divided by the number of processors and your system is running very slowly, the JVM is very likely to have entered an infinite loop. Otherwise, if CPU usage is normal, you are more likely to have a deadlock situation.

• 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.
• Analyzing deadlocks
  A deadlocked process does not use any CPU time.

Parent: Windows problem determination

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