java.lang.OutOfMemoryError: PermGen space

This error message occurs when memory reserved for permanent generation of garbage collectors (GC) runs out. Other GC generations are: young generation -> tenured generation -> permanent generation.

You can set the permanent generation memory pool:

-XX:PermSize=64m
-XX:MaxPermSize=256m

In contrast to setting heap memories:

-Xms768m 
-Xmx1024m

For java service wrapper, add to wrapper.conf

wrapper.java.additional.2=-XX:PermSize=64
wrapper.java.additional.3=-XX:MaxPermSize=256

Some of the default values for Sun JVMs are listed below.