I have generated a heap dump from my java application which has been running for some days with the jmap tool -> this results in a large binary heap dump file.
jmap
You can just run "Java VisualVM" which is located at jdk/bin/jvisualvm.exe
jdk/bin/jvisualvm.exe
This will open a GUI, use the "File" menu -> "Load..." then choose your *.hprof file
That's it, you're done!