named executor failure

[jknack]

The following code results in exception:

{
    executor("async", Executors.newFixedThreadPool(10));

    get("/556/async", deferred("async", () -> "Async"));
  }

The error occurs bc the default executor wasn't set.

This problem is a side effect of #506

[jknack]

Oh forgot to mention the workaround:

{
  executor(MoreExecutors.directExecutor());
  executor("async", Executors.newFixedThreadPool(10));

  get("/556/async", deferred("async", () -> "Async"));
}