KB16582: How to generate a JVM Thread Dump on IBM WebSphere Application Server 6.0

Whenever an application server process unexpectedly closes, the JVM creates a thread dump under / with a name like javacore.date.time.id.txt. However, in some cases (e.g. hanging related issues) where the application process does not unexpectedly close, one must obtain the JVM thread dump to troubleshoot the issue. The following instructions show how to generate (or force) a JVM thread dump while the application process is still running, which then can be used by the WebSphere Application Server administrator or Strategy Technical Support for troubleshooting purposes:
 

• Open the WSAdmin console, as shown below:
  

• Execute the following two commands:
  set jvm
  $AdminControl invoke $jvm dumpThreads
  

• Browse to the / and look for an output file with a name like javacore.date.time.id.txt.
  Example: C:\Program Files\IBM\WebSphere\AppServer\profiles\default\javacore.20070826.210050.3188.txt
  

For more information on WSAdmin, refer to the following IBM WebSphere v6r0 document:
 
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/topic/com.ibm.websphere.express.doc/info/exp/ae/txml_scriptingep.html
 
Third Party Software Installation
WARNING:
The third-party product(s) discussed in this technical note is manufactured by vendors independent of Strategy. Strategy makes no warranty, express, implied or otherwise, regarding this product, including its performance or reliability.