Java Garbage Collection Concepts
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Internal
Permanent Generation
Metaspace
Overview
The metaspace has been introduced by Java 8 to replace permanent generation. Most allocations for the class metadata are now allocated out of native memory.
Capacity
By default the metaspace can extend to the limit of the physical memory.
It can be limited by MaxMetaspaceSize. If the flag is not specified, the metaspace will resize.
Monitoring
It is considered part of the heap?