How to get Java8 Metaspace dump (not heap dump)

jvm dump metaspace
czh picture czh · Jun 20, 2016 · Viewed 15.5k times · Source

Are there any tools that are able to get Metaspace dump from a Java8 hotspot vm ?

Answer

apangin picture apangin · Jun 21, 2016

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.

Related questions

Get deadlock detection from running programm or dump in Java

I have a piece of running java software that is jammed. I would like to get a view inside but have got no idea how to do that. Is there some tool that I can give a PID and it …

Read More
What are the -Xms and -Xmx parameters when starting JVM?

Please explain the use of Xms and Xmx parameters in JVMs. What are the default values for them?

Read More
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

I am trying to use Notepad++ as my all-in-one tool edit, run, compile, etc. I have JRE installed, and I have setup my path variable to the .../bin directory. When I run my "Hello world" in Notepad++, I get this …

Read More