The "Java AMF Client" API might help you here. It's a Java API for building and sending AMF requests to the server.
http://opensource.adobe.com/wiki/display/blazeds/Java+AMF+Client
I've also heard good things about Gomez but I believe it's a pay service and will require some overhead to get up and running. But if you're looking for a more comprehensive solution, many people in my company have used it on projects with a Java / BlazeDS backend.
http://www.gomez.com/
