Pretty sure that i am blowing past the notify() before the wait()

Question

i am working on a project, and here is my basecase.
public class Worker extends Thread {
  public boolean taskFinished = false;
  private Object flag = new Object();
  private FutureTask task;
  public void run() {
    while(true) {
      synchronized(flag) {
        flag.wait();
        taskFinished = false;
        task.run();
        taskFinished = true;
  public void execute(FutureTask task) {
    synchronized(flag) {
      this.task = task;
      flag.notify();
}here is an example of how i'd use this class:
FutureTask ft = new FutureTask(task);
Worker worker = new Worker();
worker.start();
// Thread.sleep(10);  <-- this "fixes" the problem (well, makes the problem much less probable)
worker.execute(ft);
......without the wait(10) , the program works about 80% of the time.
with the wait(10) , my testing has always completed successfully. but that does not really solve the problem.
i am almost certain that i am calling flag.notify() before the flag.wait() ..... i have no idea of what to do.
note: this is probably a "non-standard" way to use FutureTask , and its more appropriate to use an ExecutorService to take care of this
business, but my problem is larger than this base case. i want to use this general structure. otherwise, i need to re-design.

Answer 1

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