IBM suggest to enable the verbose gabage collector option and use the MustGather software.
HOWTO Enabling verbosegc on releases of Version 7.0 - Application Servers
- In the Administrative Console, expand Servers, expand Server Types, and then click WebSphere application servers.
- Click on the server that you would like to work with, for example, server1.
- On the Configuration tab, under Server Infrastructure, expand Java and Process Management, and click Process Definition.
- Under the Additional Properties section, click Java Virtual Machine.
- Check the Verbose Garbage Collection check box.
- Apply and Save the changes.
- Restart the Application Server for the changes to take effect.
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