How to monitor external process ran by ProcessBuilder?

Question

This should be rather simple, but I don\'t see anything helpful in JavaDocs.

What I need is to run some external process from my Java code and then be able to monito

Answer 1

Start a new Thread which calls Process.waitFor() and sets a flag when that call returns. then, you can check that flag whenever you want to see if the process has completed.

public class ProcMon implements Runnable {

  private final Process _proc;
  private volatile boolean _complete;

  public boolean isComplete() { return _complete; }

  public void run() {
    _proc.waitFor();
    _complete = true;
  }

  public static ProcMon create(Process proc) {
    ProcMon procMon = new ProcMon(proc);
    Thread t = new Thread(procMon);
    t.start();
    return procMon;
  }
}

(some boilerplate omitted).