First, it might be good for you to get the total amount of free memory on your system (using -m will present the information in MB):

[[email protected] bin]# free -m
total       used       free     shared    buffers     cached
Mem:          1770       1754         15          0         74        894
-/+ buffers/cache:        785        984
Swap:         1983         74       1909
Looks like I have about 1754 MB free.

Edit the following file: /opt/jrun4/bin/jvm.config then change the following line from: -XX:MaxPermSize=512m to something higher, like: -XX:MaxPermSize=768m

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