Java 9 : How to start a new Process and get process id

Points to Remember

1. This post used Java 1.9 since ProcessHandle was introduced in Java 1.9.

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• Java 9 Feature
• List all processes running on the OS
• Get the information of the current process
• Start a new Process and get its Process Id
• How to get Process Information from Process Id
• Destroy a running process

Get the Current Process Information.

In this example we will try to get information about the current process. For this we will use the m

import java.io.IOException;

/**
 * @author ekiras
 */
public class StartProcess {

    public static void main(String[] args) {
        try {
            Process process = startProcess("tail -F /dev/null");
            printProcessInfo(process.toHandle());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void printProcessInfo(ProcessHandle processHandle){
        System.out.println("---Process Info---");
        System.out.println(" Process Id :: " + processHandle.getPid());
        System.out.println(" Process isAlive() :: " + processHandle.isAlive());
        System.out.println(" Process children :: " + processHandle.children().count());
        System.out.println(" Process supportsNormalTermination() :: " + processHandle.supportsNormalTermination());
        System.out.println(" Process Info :: " + processHandle.info().toString());

    }

    public static Process startProcess(String command) throws IOException {
        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec(command);
        return process;
    }

}

When we run the above code, it will return the following output.

---Process Info---
 Process Id :: 1865
 Process isAlive() :: true
 Process children :: 0
 Process supportsNormalTermination() :: true
 Process Info :: [user: Optional[root], cmd: /usr/bin/tail, args: [-F, /dev/null], startTime: Optional[2016-11-16T12:40:10.460Z], totalTime: Optional[PT0S]]