I'm using Apache QPID with Java an as AMQP implementation and I've just got proton-j upgraded to version 0.16 (automatically, even though Maven web site still lists 0.15 as the latest version - weird) and now my use of the Messenger API is marked as deprecated, with the helpful message:
Messenger will be removed from upcoming proton-j releases.
But what to use instead? I don't see any other candidate for high level message delivery API, and the examples in the Proton source also still show Messenger as the high level messaging API.
I see that there is also a thing called Reactor (which isn't actually new) but that is a low level reactor pattern implementation and their message sending example assumes I'm going to handle message marshaling myself over (almost) raw sockets.
Is there any hope for a Proton-J user that needs a high level messaging API?
At the moment the Qpid project is still evaluating the road forward for a simple Java based AMQP client that lives alongside proton-j or as its own project. There are some other options though:
You can use Qpid JMS which is using Proton-J under the covers, this would give you a JMS client that speaks AMQP v1.0 and supports connection failover.
Another option is the vertx-proton that is part of Vert.x v3.2+ I believe. The maven repo for this is here.