How to get the process id of the Java Application?

a. Using jps command

‘jps’ command return the Process id followed by application name.

Test.java

import java.util.concurrent.TimeUnit;

public class Test {
 public static void main(String args[]) throws InterruptedException {
  while(true) {
   TimeUnit.MINUTES.sleep(15);
  }
 }
}

Run Test.java.

Open another terminal and execute the command ‘jps’, you can see the all the java process details.

$ jps
86817 Jps
83984 WrapperSimpleApp
77527 
81160 BootLanguagServerBootApp
81535 jar
86815 Test
80926

b. Programmatically

Below statements return the process id of java application.

RuntimeMXBean bean = ManagementFactory.getRuntimeMXBean();

String beanName = bean.getName();

long pid = Long.valueOf(beanName.split("@")[0]);

Test.java

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.util.concurrent.TimeUnit;

public class Test {
 public static void main(String args[]) throws InterruptedException {
  RuntimeMXBean bean = ManagementFactory.getRuntimeMXBean();

  String beanName = bean.getName();
  long pid = Long.valueOf(beanName.split("@")[0]);
  System.out.println("PID  = " + pid);

  while (true) {
   TimeUnit.MINUTES.sleep(15);
  }
 }
}

Run Test.java, it prints the process id of the application.

$javac Test.java

$java Test

PID  = 86830

Open another terminal or command prompt and execute the command ‘jps’, and confirm the process id of the application ‘Test.java’.

$ jps
83984 WrapperSimpleApp
86832 Jps
77527 
81160 BootLanguagServerBootApp
81535 jar
80926 
86830 Test

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