How to obtain unique JVM identifier?

Question

How can Java code obtain a unique identifier for the JVM in which it's running? On a Unix system, an example of what I'm looking for would be the PID of the process in which the JVM is running (assuming a one-to-one mapping between JVM's and processes).

Answer 1

We have been using:

import java.lang.management.ManagementFactory;
String jvmName = ManagementFactory.getRuntimeMXBean().getName();

Which gives something like <pid>@<hostname>, at least in Sun/Oracle JVMs.