How to Resolve PermGen Space Errors in Tomcat 6.0?

Resolving PermGen Space Errors in Tomcat 6.0

In the midst of indexing operations in Tomcat 6.0, you may encounter the dreaded permgen space error. This issue arises due to an insufficient amount of space allocated for the permanent generation, which stores classes, methods, and other metadata.

Increasing PermGen Space

To increase the permgen space, you can use the -XX:MaxPermSize argument. For instance, the following command will allocate 128 megabytes to the permgen space:

-XX:MaxPermSize=128m

Alternative Solution

However, simply increasing the permgen space offers a temporary respite rather than a permanent solution. Instead, consider enabling the garbage collection of the PermGen by using the following arguments:

-XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled

This approach allows the JVM to reclaim unused classes and objects within the PermGen, mitigating the space constraint.

Other Considerations

Frequent redeployments can contribute to this issue. Use monitoring tools like virtualvm or jconsole to observe the PermGen space utilization and verify if it stabilizes after initial indexing.

If the problem persists, it's worth exploring alternative JVMs like the IBM JVM. Unlike the PermGen-based Oracle JVM, the IBM JVM eliminates the need for a Permanent Generation and circumvents this error.

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