https://docs.oracle.com/en/java/javase/11/troubleshoot/troubleshoot-memory-leaks.html#GUID-93A2C2F1-C22C-4E76-83B8-785D3DD869E9

A) Get a Heap Histogram

1.  Modify the following lines

You can use the jmap utility to get a heap histogram from a core file, as shown in the following example.

- jmap -histo core_file
+ jmap --histo --exe <jdk path/bin/java> --core core_file

- jmap -histo \ /java/re/javase/6/latest/binaries/solaris-sparc/bin/java core.27421
+ jmap --histo --exe /java/re/javase/12/latest/binaries/solaris-sparc/bin/java --core core.27421