Retrieve All Processes Data of Process API in Java 9

In Java 9, Process API has been used to control and manage operating system processes. ProcessHandle class provides the process’s native process ID, start time, accumulated CPU time, arguments, command, user, parent process, and descendants. It also provides a method to check processes liveness and to destroy processes. We retrieve all ProcessHandle data as a stream by using the allProcesses() method.

In the below example, we retrieve all the processes information.

Example

import java.util.stream.Stream;
import java.util.Optional;
import java.util.stream.Stream;

public class AllProcessesTest {
   public static void main(String args[]) throws InterruptedException {
      System.out.println("---------------------------");
      System.out.println("All Processes:");
      Stream<ProecessHandle> processStream = ProcessHandle.allProcesses();
      processStream.forEach(process -> printInfo(process));
   }
   private static void printInfo(ProcessHandle processHandle) {
      System.out.println("---------");
      System.out.println("Id: " + processHandle.pid());
      System.out.println("isAlive(): " + processHandle.isAlive());
      System.out.println("number of childrens: " + processHandle.children().count());
      System.out.println("isSupportsNormalTermination(): " + processHandle.supportsNormalTermination());

      ProcessHandle.Info processInfo = processHandle.info();
      System.out.println("Info: " + processInfo.toString());
      System.out.println("Info arguments().isPresent(): " + processInfo.arguments().isPresent());
      System.out.println("Info command().isPresent(): " + processInfo.command().isPresent());
      System.out.println("Info totalCpuDuration().isPresent(): " + processInfo.totalCpuDuration().isPresent());
      System.out.println("Info user().isPresent(): " + processInfo.user().isPresent());
   }
}

Output

---------------------------
All Processes:

Id: 7056
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe, startTime: Optional[2020-03-09T03:26:00.406Z], totalTime: Optional[PT1M52.15625S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 6168
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe, startTime: Optional[2020-03-09T03:26:01.567Z], totalTime: Optional[PT2M24.671875S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 7972
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe, startTime: Optional[2020-03-09T03:26:03.118Z], totalTime: Optional[PT29.09375S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 3368
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe, startTime: Optional[2020-03-09T03:27:26.511Z], totalTime: Optional[PT37.84375S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 2456
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\WINDOWS\System32\conhost.exe, startTime: Optional[2020-03-09T03:30:49.514Z], totalTime: Optional[PT0.390625S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 7804
isAlive(): true
number of childrens: 4
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Mozilla Firefox\firefox.exe, startTime: Optional[2020-03-09T03:30:51.441Z], totalTime: Optional[PT38.046875S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 8172
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Mozilla Firefox\firefox.exe, startTime: Optional[2020-03-09T03:30:53.293Z], totalTime: Optional[PT4.03125S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 6008
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Mozilla Firefox\firefox.exe, startTime: Optional[2020-03-09T03:30:54.081Z], totalTime: Optional[PT5M28.078125S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 1032
isAlive(): false
number of childrens: 0
isSupportsNormalTermination(): false
Info: []
Info arguments().isPresent(): false
Info command().isPresent(): false
Info totalCpuDuration().isPresent(): false
Info user().isPresent(): false
---------
Id: 5044
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Java\jdk-9.0.4\bin\java.exe, startTime: Optional[2020-03-09T04:12:39.567Z], totalTime: Optional[PT1.28125S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true