How to get Process ID and Live Threads of a Java Application?

This is a simple Java Thread Life Cycle diagram for your reference.

Below is a simple program which tells you how to get Process ID and Total # of Live Threads of a Java Application.

package com.crunchify.tutorials;

/**
 * @author Crunchify.com
 */

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadMXBean;

public class CrunchifyGetProcessIDThread {
	public static void main(String[] args) {
		RuntimeMXBean runtimeBean = ManagementFactory.getRuntimeMXBean();

		String jvmName = runtimeBean.getName();
		System.out.println("JVM Name = " + jvmName);
		long pid = Long.valueOf(jvmName.split("@")[0]);
		System.out.println("JVM PID  = " + pid);

		ThreadMXBean bean = ManagementFactory.getThreadMXBean();

		int peakThreadCount = bean.getPeakThreadCount();
		System.out.println("Peak Thread Count = " + peakThreadCount);
	}
}

Output:

Name = 12228@D-DESKTOP
PID  = 12228
Peak Thread Count = 5

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