The Java Heap Analysis Tool (jhat) TechNotes/man page lists four methods for generating a heap dump that can be analyzed by jhat.

You can fix your Java memory leak problem without a costly JVM heap dump. Just use Java Flight Recorder's Old Object Sample event and view the recording in JDK Mission Control.

$ jcmd 7544 GC.run 5. Use JConsole or Java Mission Control Both JConsole and Java Mission Control provide a user-friendly interface that interacts with the Java diagnostic command utility, which can ...