How to create a process using ProcessBuilder in Java 9?

JavaObject Oriented ProgrammingProgramming

Java 9 added ProcessHandle interface to Process API to enhance Process class. An instance of the ProcessHandle interface identifies a local process that allows us to query process status and managing processes, and ProcessHandle.Info allows us to use local code because of the need to obtain the PID of a local process.

ProcessBuilder class can be used to create separate operating system processes. In the below example, we can create a process of "notepad" application by using the ProcessBuilder class.

Example

import java.time.ZoneId;
import java.util.stream.Stream;
import java.util.stream.Collectors;
import java.io.IOException;

public class ProcessBuilderTest {
   public static void main(String args[]) throws IOException {
      ProcessBuilder pb = new ProcessBuilder("notepad.exe");
      String np = "Not Present";
      Process p = pb.start();
      ProcessHandle.Info info = p.info();

      System.out.printf("Process ID : %s%n", p.pid());
      System.out.printf("Command name : %s%n", info.command().orElse(np));
      System.out.printf("Command line : %s%n", info.commandLine().orElse(np));

      System.out.printf("Start time: %s%n", info.startInstant().map(i -> i.atZone(ZoneId.systemDefault()).toLocalDateTime().toString()).orElse(np));

      System.out.printf("Arguments : %s%n", info.arguments().map(a -> Stream.of(a).collect(
Collectors.joining(" "))).orElse(np));

      System.out.printf("User : %s%n", info.user().orElse(np));
   }
}

The above example launches the notepad application as below

Output

Process ID : 3728
Command name : C:\WINDOWS\System32\notepad.exe
Command line : Not Present
Start time: 2020-04-20T18:06:30.378
Arguments : Not Present
User : Tutorialspoint\User
raja
Published on 20-Apr-2020 16:24:53
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