Summary

This chapter is in essence a continuation of Chapter 15, which introduces the concepts behind the JMS API and explains how you can communicate between applications and systems through the production and consumption of messages. However, in Chapter 15, only synchronous messaging was discussed.

This chapter has methodically introduced you to MDBs, J2EE's solution to consuming JMS messages in an asynchronous manner, and their value as an EJB-type JMS message listener within the context of an EJB container. MDBs are easy to implement, and a simple example has been supplied so that you can get a handle on how to develop and deploy a working MDB to WebLogic Server.