I was trying to get an example to work with the new ProcessHandle API. My goal was to wait on another process (Spotify) to terminate before printing something to the console:

ProcessHandle handle =
       ProcessHandle.allProcesses()
         .filter(h -> h.info().commandLine().map(cmd -> cmd.contains("Spotify")).orElse(false))
       .findFirst()
       .orElseThrow(() -> new IllegalArgumentException("No matching handle found"));

System.out.println(handle.info());

ProcessHandle completed = handle.onExit().get();
System.out.println(completed.isAlive());

However this code doesn't wait on `handle` to be terminated, as the JavaDoc of onExit led me to believe: "Calling onExit().get() waits for the process to terminate and returns the ProcessHandle.". What I expected: the get() call blocks until I terminate the Spotify process. Instead, it runs to completion and prints true for the `isAlive` call in the end. Am I missing something?

Env: Java(TM) SE Runtime Environment (build 9-ea+157-jigsaw-nightly-h6122-20170221) on MacOS.