perm gen : Java Glossary

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perm gen
ake permgen aka Permanent Generation heap. In Oracle’s JVM (Java Virtual Machine), the interned Strings are stored in a special pool of RAM (Random Access Memory) called the perm gen, where the JVM also loads classes and stores natively compiled code. However, the intered Strings behave no differently than had they been stored in the ordinary object heap.

This an internal feature of the run time that is transparent to the program. Not all JVMs (Java Virtual Machines) necessarily have a separate perm gen. The only time it becames a concern is when you configure heap and stack space on the java.execommand line.

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