What is PermGen space?

[Edward Durai]

I have one problem, When I run my project.
Can You tell me What is PermGen space error

What situations this type of erros occurs

"Caused by: java.lang.OutOfMemoryError: PermGen space"

Kindly send your replies
Thanks

[Purushoth Thambu]

Perm generation refers to the heap space where all the loades classes are stored. It's exclusively used to store the class definitions. Guess your applications has very huge number of classes.

You can increase the PermSize :
java -XX:MaxPermSize=128M <application>

Try incrementing the permsize by trail and error.

This link should help:
http://java.sun.com/docs/hotspot/gc1.4.2/faq.html

[Ernest Friedman-Hill]

Originally posted by Purushothaman Thambu:
Perm generation refers to the heap space where all the loades classes are stored. It's exclusively used to store the class definitions. [/URL]

Well, no, not exactly. It's also used to store interned String objects -- String literals, and Strings returned by the intern() method -- and a few other little things. I believe (although I'm not positive) that in Java 5, the pooled wrapper objects used for autoboxing are stored there as well.