Java: How to wait for fileChanged to execute?

I'd like to have my thread (the main/EDT) wait until changes to a file occur and then wait. DefaultFileMonitor extends Runnable and hence runs in a thread of its own. Here is a SSCE:

import java.io.File;
import org.apache.commons.vfs.*;
import org.apache.commons.vfs.impl.DefaultFileMonitor;

public class FileChangeListener implements FileListener {
    DefaultFileMonitor fm;
    public final static File logFile = new File("t.txt");

 public void startListening() throws FileSystemException {
    final FileSystemManager fsManager = VFS.getManager();
    final FileObject listendir = fsManager.toFileObject(logFile);

    fm = new DefaultFileMonitor(this);
    fm.addFile(listendir);
    fm.start();
}

     @Override
public void fileCreated(FileChangeEvent fce) throws Exception {
    fileChanged(fce);
}

@Override
public void fileDeleted(FileChangeEvent fce) throws Exception {
    //hmm..why deleted?
}

@Override
public void fileChanged(FileChangeEvent fce) throws Exception {
    System.out.println("fileChanged executed");
}
}

The main:

import java.io.PrintWriter;

public class App {

public static void main(String[] args) {
    FileChangeListener fcl = new FileChangeListener();
    try {
        fcl.startListening();
        final PrintWriter printWriter = new PrintWriter(FileChangeListener.logFile);
        printWriter.println("Hello Threads!");
        printWriter.close();

        //EXECUTE THE FOLLOWING ONLY AFTER fileChanged
        System.out.println("Mission complete.");
    } catch (Exception ex) {
    }
}
}

Append the following to App.main(..) after printWriter.close():

            synchronized (fcl) {
                fcl.wait();
            }
            //EXECUTE THE FOLLOWING ONLY AFTER fileChanged
            System.out.println("Mission complete.");

and append the following to FileChangeListener.fileChanged(..) after System.out.println("fileChanged executed"):

synchronized (this) {
        this.notifyAll();
    }