As Web service Messaging becomes important in constructing loosely coupled systems, the Apache Axis2 architecture does not assume any particular form of interaction. From any type of message exchange pattern to synchronous/asynchronous behavior, Axis2 is built to support it all. In this article by Ajith Ranabahu and Srinath Perera learn about the concepts and the client API of well known messaging scenarios in Axis2. http://www.onjava.com/pub/a/onjava/2005/07/27/axis2.html?page=1 [1]