IBM Support

MustGather: Out of Memory errors with WebSphere Application Server on AIX, Linux, or Windows

Technote (troubleshooting)


Collecting data for Out of Memory errors with IBM WebSphere Application Server. Gathering this MustGather information before calling IBM Support will help familiarize you with the troubleshooting process and save you time.

Resolving the problem

This MustGather details how to collect necessary logs for an OutOfMemory exception on AIX, Linux, or Windows.

If IBM support has already been contacted for this issue, continue through this document as requested by the support representative. Otherwise, refer to MustGather: Read first for WebSphere Application Server.

OutOfMemory specific MustGather information

Note: If the problem has already occurred with verboseGC enabled, please skip to Step 6.
  1. Enable verboseGC.
    Enabling verboseGC in WebSphere Application Server.

  2. Stop the WebSphere Application Server.

  3. Clear all Application Server log files.

  4. Restart the Application Server.

  5. Recreate the Out of Memory condition or wait for the condition to reoccur.

  6. Collect the following:
    *Please collect data for a single OOM event on a single server unless otherwise instructed.*
    • heapdump*.phd
    • javacore*.txt
    • Snap*.trc
    • server.xml file for the server experiencing the OutOfMemory exception.
    • V8.0.0.2 and above (optional): A system core file is generated with OOMs on Java 6 R26 and above. Please collect the respective core*.dmp file(s) if requested by IBM Support.
    • All files located in the following directory:
      • For WebSphere Application Server V6.0 to V8.0:
        • AIX or Linux:

        • Windows:

      • For WebSphere Application Server V5.1:
        • AIX or Linux:

        • Windows:

For a listing of all technotes, downloads, and educational materials specific to Out of Memory errors, search the WebSphere Application Server support site .

Related information
Submitting information to IBM support
Steps to getting support for WebSphere Application Server
MustGather: Read first for WebSphere Application Server
Troubleshooting guide for WebSphere Application Server
Generating System Cores on OutOfMemory Errors

Exchanging data with IBM Support

To diagnose or identify a problem, it is sometimes necessary to provide Technical Support with data and information from your system. In addition, Technical Support might also need to provide you with tools or utilities to be used in problem determination. You can submit files using one of following methods to help speed problem diagnosis:

Read first and related MustGathers

Related information

Recording your screen to share with IBM Support

Cross reference information
Segment Product Component Platform Version Edition
Application Servers WebSphere Application Server - Express Hangs/performance degradation AIX, Linux, Windows 7.0, 6.1, 6.0, 5.1
Application Servers Runtimes for Java Technology Java SDK

Document information

More support for: WebSphere Application Server
Out of Memory

Software version: 6.1, 7.0, 8.0, 8.5, 8.5.5, 9.0

Operating system(s): AIX, Linux, Windows

Software edition: Base, Express, Network Deployment

Reference #: 1138587

Modified date: 16 April 2012