This application is a Java implementation of the following blog post:

http://www.javacodegeeks.com/2012/04/connect-to-rabbitmq-amqp-using-scala.html

with some correction to the technique here: 
http://blog.hasbeco.me/post/35586367370/akka-amqp-play-and-scala-a-follow-up

Update:
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Add to this demo RPC call over Rabbit MQ. I modified the JsonRpcServer & JsonRpcClient to do two things:

1. Changed JsonRpcServer to use DefaultConsumer instead of QueueingConsumer so as not to block the thread.
2. Changed both JsonRpcServer & JsonRpcClient to handle complex types instead of just primitves (and strings).

How To Use:
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1. One way messaging:

a. Create an untyped actor (in this demo: CommandActor)
b. Connect a Channel & Queue to the Actor: channel.basicConsume(RabbitConfig.getRabbitQueue(), false, "event_filter", new CommandConsumer(channel, actor)); (in Sender class in this demo)
c. Publish messages to the queue as usual.

2. RPC

a. On the server create a service that will be typed actor (in this demo: remote.RemoteCalcultor, remote.RemoteCalculatorImpl).
b. Create the typed actor: RemoteCalculator calculatorkActor =TypedActor.get(Akka.system()).typedActorOf(new TypedProps<RemoteCalculatorImpl>(RemoteCalculator.class, RemoteCalculatorImpl.class)); (in infrastucture.Sender)
c. Create the JsonRpcServer: calculator = new JsonRpcServer(channel, RabbitConfig.getRabbitRpcQueue(), RemoteCalculator.class, calculatorkActor); (note: Use the JsonRpcServer in the infrastructure and not the one that comes with RabbitMQ driver)
d. Start the RpcServer: calculator.start();

e. On the client create a JsonRpcClient: JsonRpcClient client = new JsonRpcClient(channel, "", RabbitConfig.getRabbitRpcQueue()); (in services.CalculatorFactory) (again note: Use the class from infrastructure not RabbitMQ driver).
f. Call the remote service: calculator.add(1, 2); (in controllers.Application)

Future:
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This should really be made into a Play 2 Module...