WAS v8.5 > Troubleshoot

Collect Java dumps and core files using the dmgr console

We can use the Java runtime environment to create dump and core files to help with troubleshooting. We can use the dmgr console to trigger the creation of these dumps and core files.

The JVM is capable of producing Java dump and core files to aid in troubleshooting. We can use heap dump and system dump files to help diagnose memory-related problems, such as memory leaks. We can use Java core files to help diagnose problems where the CPU is persistently 100% busy, when threads are hanging, or where threads are in a deadlock.

The process of generating dump and core files can have a noticeable performance impact on your system that can last for many seconds or minutes. If necessary, use your test and development environments to better understand the impact of generating dump and core files.

Generating a heap dump or a system dump is not supported for a non-IBM JVM. If you attempt to generate a heap dump or a system dump using the dmgr console against a non-IBM JVM, the following message is displayed in the dmgr console:

The Heap dump request to the server <server_name> failed because of the following reason: 
Could not take single dump as Sun Microsystems Inc. is not supported.
or
The System dump request to the server <server_name> failed because of the following reason: 
Could not take single dump as Sun Microsystems Inc. is not supported.

The Heap dump request to the server <server_name> failed because of the following reason: 
Could not take single dump as HP-UX is not supported.
or
The System dump request to the server <server_name> failed because of the following reason: 
Could not take single dump as HP-UX is not supported.
sptcfg

  1. In the navigation pane, click Troubleshooting > Java dumps and cores.

  2. Select the server or servers you need to collect a dump or core from.

  3. Click System Dump or Java Core or Heap Dump depending on your need.


Results

The system dump or heap dump or Java core is created and stored in the profile root directory of the server from which you requested the dump or core.


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