JMap with JVM Debugging Disabled

Question

Can I use jmap to create a java memory heap on a JVM which was started with debugging disabled? If so, how?

Answer 1

To use jmap you just need a JVMID, which is the process identifier of the JVM you want to dump.

First use jps to get the JVMID. Then use jmap to dump the heap to a file.

Example:

jmap -dump:format=b,file=heap.bin <JVMID>

Answer 2

(You know about visualvm and that it can connect to a running Java process? Requires Sun Java 6)