My Web application is running on tomcat apache-tomcat-6.0.35 and It was working fine witout any issue.But today I show bellow exception in catalina.out log and was unable to login to the system.
Jul 9, 2013 2:40:15 PM org.apache.coyote.http11.Http11Processor process
SEVERE: Error processing request
java.lang.OutOfMemoryError: PermGen space
I was under impression this exception can be ocuured when you deploy or redeploy a application. But I got this when the application is running without any issues. What could be the reason for this. Kindly advice
Each webapp in Tomcat has a separate class loader with a separate set of loaded classes. When we start Tomcat it does not load all classes of all its apps at once but rather it loads the apps lazily. When an app becomes active it starts loading its classes and it may happen that JVM runs out permgen space. That is, it may happen even without redeploying apps.