How to Fix the PermGen Space Error During Tomcat Indexing?

Addressing PermGen Space Error during Tomcat Indexing

Web applications running on Tomcat 6.0 may encounter a "permgen space" error during operations such as indexing. This error occurs when the permanent generation (PermGen) space, which holds metadata and class definitions, becomes insufficient.

To resolve this issue, you can increase the PermGen space by setting the -XX:MaxPermSize parameter. This parameter specifies the maximum size of the PermGen space, which is typically set to 64MB by default. By increasing this value, you allow more space for metadata and class definitions.

However, increasing the PermGen space only temporarily alleviates the issue. A more permanent solution involves enabling PermGen garbage collection. You can do this by setting the following parameters:

• -XX: UseConcMarkSweepGC
• -XX: CMSPermGenSweepingEnabled
• -XX: CMSClassUnloadingEnabled

These parameters allow the JVM to reclaim unused PermGen space during garbage collection.

Additionally, it's recommended to monitor the PermGen space using tools like jconsole or visualVM. This allows you to identify patterns and potential performance issues related to PermGen usage.

Alternatively, you might consider switching to a different JVM, such as the IBM JVM, which does not have a PermGen and is immune to this type of error.

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