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Are there any tools that are able to get Metaspace dump from a Java8 hotspot vm ?
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They live in a native memory region outside of the Java heap. That region is called Metaspace.
The Metaspace takes up a significant portion of the JVM's Non-Heap memory. Its main purpose is to store class metadata — the internal runtime representation of Java classes. By default, the metaspace is comprised of two parts — the Class Space and the Non-Class Space.
They are very useful to troubleshoot memory-leak problems and optimize memory usage in Java applications. In order to capture a heap dump automatically, we need to add the HeapDumpOnOutOfMemoryError command-line option that generates a heap dump when a java. lang. OutOfMemoryError is thrown.
It seems you encounter a class loading leak.
Use
jmap -clstats PID to dump class loader statistics;jcmd PID GC.class_stats to print the detailed information about memory usage of each loaded class. The latter requires -XX:+UnlockDiagnosticVMOptions.The heap dump will also help, because each class in the Metaspace has a corresponding java.lang.Class instance in the heap.
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