Thursday, November 20, 2008

Additional Steps if encountering frequent “java.lang.OutOfMemoryError: PermGen space” exception.

Glassbox does take up some additional memory slowing the startup. Also, it tends to place additional load in the PermGen (Permanent Generation) memory space - this would result in the Server crashing out with "java.lang.OutOfMemoryError: PermGen space" exception (see for details).

The fix is a simple matter of increasing your max PermGen size (default is 64MB in Sun Servers). Use the following options when starting the JVM:

This actually works for any genuine PermGen error. But note that in most cases, PermGen running out of space is because of inefficient or incorrect cleaning up for Garbage collection - that is, some where in your code, you are unnecessarily keeping references even after use.


  1. Hi Team

    I want to know means of "Calls per Operation" used in glass box test result.

  2. Hi Reigh

    I didnt come across "Calls per Operation" in the Glassbox 2.0 web app, the JMX details nor in the properties. Do post the exact context or a link to a screenshot...

    But I can take a guess it means the number of times a method within an operation gets called during the period of that operation.


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