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Java 8 - get current process ID (PID)

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Created by:

Tomeriko

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In this short article, we would like to show how to get the current process ID (PID) in Java 8.

There is not a direct method to do it in Java 8, but there is some trick.

Tested on: JRockit, Hotspot JVMs, Corretto.

Practical example:

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import sun.management.VMManagement;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
​
public class Program {
​
    private static int getCurrentProcessId() throws Exception {
​
        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
        Field jvm = runtime.getClass().getDeclaredField("jvm");
        jvm.setAccessible(true);
​
        VMManagement management = (VMManagement) jvm.get(runtime);
        Method method = management.getClass().getDeclaredMethod("getProcessId");
        method.setAccessible(true);
​
        return (Integer) method.invoke(management);
    }
​
    public static void main(String[] args) throws Exception {
​
        System.out.println("PID: " + getCurrentProcessId());
    }
}