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

You could use JNA. Unfortunately there is no common JNA API to get the current process ID yet, but each platform is pretty simple:

Windows

Make sure you have jna-platform.jar then:

int pid = Kernel32.INSTANCE.GetCurrentProcessId();

Unix

Declare:

private interface CLibrary extends Library {
    CLibrary INSTANCE = (CLibrary) Native.loadLibrary("c", CLibrary.class);   
    int getpid ();
}

Then:

int pid = CLibrary.INSTANCE.getpid();

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Java 9

Under Java 9 the new process API can be used to get the current process ID. First you grab a handle to the current process, then query the PID:

long pid = ProcessHandle.current().pid();