[Activity failures] Provide the decider with the details of the failures as Java Exception

[anthonime]

DRAFT: decide the right syntax in terms of event handling

Possible solution:

• exception should be automatically serialized in the activity part
• exception should be deserialized in the decider part

//

@OnActivityFailed(activity = ContactWorker.class)
public void onContactWorkerFailed(WorkerDoesNotExistException e){

}

@OnActivityFailed(activity = ContactWorker.class)
public void onContactWorkerFailed(Exception e){

}