07 February 2012

How to take a Java heap dump from command line

A heap dump is a great way to analyze a Java program in search of memory leaks. I mostly use Eclipse Memory analyzer for such an analysis. It is possible to acquire a heap dump from inside Eclipse Memory analyzer. But it may not always be possible to run a GUI in a foreign environment.

Use jps to find out the process id
11448 MyLeakingApplication
12084 Jps

Use jmap to acquire the dump
C:\>jmap -dump:format=b,file=c:\Temp\mymemorydump.hprof 11448
Dumping heap to C:\Temp\mymemorydump.hprof ...
Heap dump file created

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