exception - Dealing with "java.lang.OutOfMemoryError: PermGen space" error -

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Recently I went to this error in my web application:

java.lang .OutOfMemoryError: Perm Gain Space

It is a special hibernate / JAPA + IceFAS / JSF application running on Tomcat 6 and JDK 1.6. Apparently this may happen once again for some time after re-deployment.

What else can be done to avoid it? How do I fix this problem?

The solution was to add these flags to the JVM command line when it was a tomcat: 

  -XX: + CMSClassUnloadingEnabled -XX: + CMSPermGenSweepingEnabled   
 You can do this by closing the Tomcat service, then the Tomcat / bin directory and the running tomcat6w. Exe Under the "Java" tab, add a log in the "Java Options" box. Click "OK" and then restart the service.  
 If you get an error  The specified service does not exist as an installed service  You should run:  
  tomcat6w // ES / Servicename   
 where   sovereignname   is the name of the server viewed as services. MSc  
 Source: Ork's comment.

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