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I would like to know if the JVM normally unloads classes in order to decrease the PermGen space. So here my questions:
FYI, I did try some of the solutions on the web but none of them answered my questions. (for example: What does JVM flag CMSClassUnloadingEnabled actually do?)
PS: I am referring to Java 6 + hibernate (The class loading is handled by hibernate)
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Open eclipse. ini file, it is located in root eclipse directory. there you can change -Xms and -Xmx parameter to change permgen size. There you can change -XX:PermSize and -XX:MaxPermSize.
In the place of PermGen, a new feature called Meta Space has been introduced. MetaSpace grows automatically by default. Here, the garbage collection is automatically triggered when the class metadata usage reaches its maximum metaspace size. It is removed from java 8.
Simply put, Metaspace is a new memory space – starting from the Java 8 version; it has replaced the older PermGen memory space.
lang. OutOfMemoryError: PermGen Space is a runtime error in Java which occurs when the permanent generation (PermGen) area in memory is exhausted. The PermGen area of the Java heap is used to store metadata such as class declarations, methods and object arrays.
The only way to get rid of loaded classes is to allow JVM to GC the class loader which loaded these classes by eliminating all references to this class loader. This is what happens in web servers when we undeploy a webapp.
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