How to get all child processes of a process using Process API in Java 9?

Process Processing classes and related APIs were introduced in Java 9. We can use the ProcessHandle interface and related methods to obtain pid and other related process information. We need to get all the children of the process and then use the java.lang.ProcessHandle.children() method. This method returns a stream, usually a process without child processes.

In the example below, we can get the first process and retrieve its child process information.

Example

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

public class ChilderenProcessTest {
   public static void main(String args[]) throws InterruptedException {
      System.out.println("---------------------------");
      System.out.println("Children Processes:");
      <strong>Optional<ProcessHandle></strong> processHandle = <strong>ProcessHandle.allProcesses().findFirst()</strong>;
      processHandle.<strong>ifPresent</strong>(proc -> proc.<strong>children()</strong>.forEach(child -> System.out.println("PID: [ " + <strong>child.pid()</strong> + " ], Cmd: [ " + <strong>child.info().command()</strong> + " ]")));
   }
}

Output

<strong>---------------------------
Children Processes:
PID: [ 0 ], Cmd: [ Optional.empty ]
PID: [ 4 ], Cmd: [ Optional.empty ]
PID: [ 424 ], Cmd: [ Optional.empty ]
PID: [ 504 ], Cmd: [ Optional.empty ]
PID: [ 560 ], Cmd: [ Optional.empty ]
PID: [ 444 ], Cmd: [ Optional.empty ]
PID: [ 1236 ], Cmd: [ Optional.empty ]
PID: [ 1288 ], Cmd: [ Optional.empty ]
PID: [ 1408 ], Cmd: [ Optional.empty ]
PID: [ 1424 ], Cmd: [ Optional.empty ]
PID: [ 1452 ], Cmd: [ Optional.empty ]
PID: [ 1468 ], Cmd: [ Optional.empty ]
PID: [ 5412 ], Cmd: [ Optional[C:\WINDOWS\System32\taskhostex.exe] ]
PID: [ 3760 ], Cmd: [ Optional[C:\Program Files\Synaptics\SynTP\SynTPEnh.exe] ]
PID: [ 5216 ], Cmd: [ Optional[C:\WINDOWS\explorer.exe] ]
PID: [ 2460 ], Cmd: [ Optional[C:\Program Files (x86)\Dell Wireless\Bluetooth Suite\BtvStack.exe] ]
PID: [ 6064 ], Cmd: [ Optional[C:\Program Files\Realtek\Audio\HDA\RtkNGUI64.exe] ]
PID: [ 7172 ], Cmd: [ Optional[C:\Program Files (x86)\Google\Chrome\Application\chrome.exe] ]
PID: [ 860 ], Cmd: [ Optional[C:\Program Files (x86)\Google\Chrome\Application\chrome.exe] ]
PID: [ 9000 ], Cmd: [ Optional.empty ]
PID: [ 4180 ], Cmd: [ Optional[C:\WINDOWS\System32\cmd.exe] ]
PID: [ 3748 ], Cmd: [ Optional[C:\WINDOWS\System32\conhost.exe] ]
PID: [ 3376 ], Cmd: [ Optional.empty ]
PID: [ 2548 ], Cmd: [ Optional.empty ]
PID: [ 1820 ], Cmd: [ Optional[C:\Program Files\Java\jdk-9.0.4\bin\java.exe] ]</strong>

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