when I ran into a situation with some code where we were running out of PermGen space I had to do some reading. In the JVM, PermGen holds the metadata about classes that have been loaded/created. This information is garbage collected like the other parts of the heap, however there are rough edges that can prevent this from happening, class loaders in particular (which I won’t discuss here.) Generally, the amount of PermGen space needed is small in relation to the rest of the heap and default JVM values should work for you.
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