Finding JVM arguments in a heap dump

Solution Verified - Updated

Environment

Java

Issue

  • Is it possible to find out what JVM arguments were being used from a heap dump
  • How to find the jvm heap and permGen size in a heap dump
  • How find jvm heap size from a heap dump
  • How to find the Xmx and Xms settings in a heap dump

Resolution

For Oracle JDK and OpenJDK, locate the sun.management.VMManagementImpl object, and examine the vmArgs property using the respective queries:

Eclipse MAT OQL

select * from sun.management.VMManagementImpl

VisualVm OQL

select vm from instanceof sun.management.VMManagementImpl vm
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