In the last chapter, we talked about distributed transactions and how they are needed to coordinate transactions across various resources. Up until now, JDBC has been our only resource; in this chapter, we will talk about another very important resource: the Java Message Service (JMS). JMS is a common interface used to access an asynchronous messaging system. In this chapter, we will also talk about Message Driven Beans. We will then talk about how WebSphere Application Server (WAS) supports JMS and Message Driven Beans. We will discuss the various JMS providers supported by WAS. Finally, we will go through another automation example by deploying another version of the Personal Trade System.