Okay if you've created the core dump with gcore or gdb then you'll need to convert it to something called a HPROF file. These can be used by VisualVM, Netbeans or Eclipse's Memory Analyzer Tool (formerly SAP Memory Analyzer). I'd recommend Eclipse MAT.
To convert the file use the commandline tool jmap.
# jmap -dump:format=b,file=dump.hprof /usr/bin/java core.1234
where:
dump.hprof is the name of the hprof file you wish to create
/usr/bin/java is the path to the version of the java binary that generated the core dump
core.1234 is your regular core file.
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