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jmap

Java Memory Map Tool. More information: https://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html.

Print shared object mappings for a Java process (output like pmap):

jmap {{java_pid}}

Print heap summary information:

jmap -heap {{filename.jar}} {{java_pid}}

Print histogram of heap usage by type:

jmap -histo {{java_pid}}

Dump contents of the heap into a binary file for analysis with jhat:

jmap -dump:format=b,file={{filename}} {{java_pid}}