How can a Java program get its own process ID?

Question

How do I get the id of my Java process?

I know there are several platform-dependent hacks, but I would prefer a more generic solution.

Answer 1

Here's a backdoor method which might not work with all VMs but should work on both linux and windows (original example here):

java.lang.management.RuntimeMXBean runtime = 
    java.lang.management.ManagementFactory.getRuntimeMXBean();
java.lang.reflect.Field jvm = runtime.getClass().getDeclaredField("jvm");
jvm.setAccessible(true);
sun.management.VMManagement mgmt =  
    (sun.management.VMManagement) jvm.get(runtime);
java.lang.reflect.Method pid_method =  
    mgmt.getClass().getDeclaredMethod("getProcessId");
pid_method.setAccessible(true);

int pid = (Integer) pid_method.invoke(mgmt);