How it works...

All the magic of this recipe relies on the AsyncService class, so we will focus on that.

First, we ask the server for an instance of an executor:

Resource(name = "LocalManagedScheduledExecutorService")
private ManagedScheduledExecutorService executor;

However, we are not asking for just any executor—we want an executor that's specific to scheduling:

ScheduledFuture<User> result = executor.schedule(new AsyncTask(), 
5, TimeUnit.SECONDS);

So, we schedule our task to be executed in 5 seconds. Note that we also don't use a regular Future instance, but rather ScheduledFuture:

while (!result.isDone()) {
  try {
        TimeUnit.SECONDS.sleep(1);
      } catch (InterruptedException ex) {
        System.err.println(ex.getMessage());
    }
 }

The following code snippet shows you how we write the results to the response:

response.resume(Response.ok(result.get()).build());