Race condition when adding a RPC implementation with an output

When you add a RPC Service Implementer that contains an output reply, there is no error. However, when you try to use this RPC you get a message it does not exist.

When doing the following lines in your module's "createInstance" method:
"getRpcRegistryDependency().addRpcIplementation(Service class,implementer)"
No error is thrown, however when you try to use the RPC call you get a reply error is the Rest Client that this method is not implemented. Putting this registration inside a thread that sleeps for 15 seconds before doing the line above solves the issue.