DEV, Heap Dump Analysis

Provided you have access to the machine where Wilma is running.

 1. Create heap dump

jmap is a command line tool which comes with the installed JDK, it can be used for generating heap dumps.

Example:

jmap -dump:live,format=b,file=filename.hprof processid

• live is an optional option, it means that only live objects will be dumped (live objects are the ones which are reachable from others).
• format=b option specifies that the heap dump should be in hprof binary format
• file=filename.hprof the resulting heap dump will be called_ filename.hprof_
• processid the process id of the JVM, from where we will get the heap dump

If the process is running on a 64-bit VM then it may be advised to provide the -J-d64 option to jmap

Example: jmap -J-d64 -dump:live,format=b,file=filename.hprof processid

For further information (like Windows specific configurations):

http://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html

2. Download the generated heap dump to your computer if necessary.

3. Analyze heap dump

Use a heap dump analyzer like: https://eclipse.org/mat/