java @Asynchronous Methods: not running async

Question

I try to get an async process running. Based on this example: http://tomee.apache.org/examples-trunk/async-methods/README.html

But the method addWorkflow(Workflow

Answer 1

The issue is that Java can't decorate the implicit this pointer.

In other words, the @Asynchronous annotation won't be processed and you're doing an ordinary method call.

You can inject your so singleton with a reference to itself (call this e.g. "self"), then call self.addWorkflow.

You might also want to consider running your async code in a stateless bean. You are using a read lock for addWorkflow, but runWorkflow still has a write lock. I think you have a dead lock now: you're holding the lock until work is done, but no work can be done until the write lock is released.

Answer 2

So the normal way would be to have the @Asynchronous method in another bean from the caller method.

@Stateless
public class ComputationProcessor {

 @Asynchronous
 public Future<Data> performComputation {
   return new AsyncResult<Data>(null);
 }
}

@Stateless
public class ComputationService {

 @Inject
 private ComputationProcessor mProcessor;

 public void ...() {
   Future<Data> result = mProcessor.performComputation();
   ...
 }
}

As you discovered, it won't work if the @Asynchronous method is in the same bean than the caller.