Creating a Java heapdump in JBoss AS 6.x

Submitted by Jochus on Wed, 12/12/2012 - 23:12 | Posted in: Java
Java


If you want to create a heapdump from your application running in a JBoss AS 6.X J2EE container, you can easily perform the dump operation by some MBean in the JMX console.

  • Browse to: http://localhost:8080/jmx-console/
  • Search for com.sun.management and click on type=HotSpotDiagnostic
  • Scroll to the bottom of the page and provide the parameter /tmp/heap.dump in the textfield p0, which is actually the location to which the dump will be written. If you want to perform a garbage collection before dumping, leave p1 on value true
  • Push the button Invoke. A dump file will be available at /tmp/heap.dump. This file can easily be viewed by a tool like Java VisualVM



Also, remember that you can easily create a heap dump automatically when JBoss is going OutOfMemory. Just add the following Java arguments in your run.conf file

-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/heap.dump

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