There are several tools available for Heapdump analysis through IBM® support Web sites.
The preferred Heapdump analysis tool is the IBM Monitoring and Diagnostic Tools for Java™ - Memory Analyzer. The tool is available in IBM Support Assistant: http://www.ibm.com/software/support/isa/. Information about the tool can be found at http://www.ibm.com/developerworks/java/jdk/tools/memoryanalyzer/
Further details of the range of available tools can be found at http://www.ibm.com/support/docview.wss?uid=swg24009436