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To coordinate the two-phase commit across many different kinds of resources, the transaction manager and each of the resource managers must talk the same tongue, or use a common protocol. In the absence of such a protocol, imagine how sophisticated even a reasonably effective transaction manager would have to be. The transaction manager would have to be developed with the proprietary communication protocol of every supported resource. The most popular distributed transaction protocol used today is the XA protocol, which was developed by the X/Open group. Java EE uses this protocol for implementing distributed transaction services.

This solution demonstrates a client and a message-driven bean using streamed data. Listing 6.10 shows a client that streams a message containing data from a binary file to a message-driven EJB. It uses a message topic as a message destination.

Transaction management support in EJB is provided through the Java Transaction API (JTA). JTA is a small, high-level API exposing functionality at the distributed transaction manager layer, typically provided by the application server. As a matter of fact, for the most part, as an EJB developer you will probably need to know about only one JTA interface: javax.transaction.UserTransaction. This is because the container takes care of most transaction management details behind the scenes. As an EJB developer, you simply tell the container where the transaction begins and ends (called transaction demarcation or establishing transaction boundaries) and whether to roll back or commit. There are two ways of using transactions in EJB. Both provide abstractions over JTA, one to a lesser and one to a greater degree. The first is to declaratively manage transactions through container-managed transaction (CMT); this can be done through annotations or the deployment descriptor. On the other hand, bean-managed transaction (BMT) requires you to explicitly manage transactions programmatically. It is important to note that in this version of EJB, only session beans and MDBs support BMT and CMT. The EJB 3 Java Persistence API is not directly dependent on either CMT or BMT but can transparently plug into any transactional environment while used inside a Java EE container. We ll cover this functionality when we discuss persistence in upcoming chapters. In this chapter, we ll explore CMT and BMT as they pertain to the two bean types we discussed in chapter 3 (session beans) and chapter 4 (MDBs).

In the previous section, you learned that wildcards can be used to write generic pointcut descriptors. With wildcards, a pointcut can be associated with several methods. You will see in this section how to obtain some information about a joinpoint at run time. This is known as the joinpoint-introspection mechanism. The term introspection refers to examining the inner cause of a given phenomenon and gaining information about it. In the context of AOP, the phenomenon is the joinpoint, and you want to retrieve information about the part of the actual program that allows the joinpoint to occur. A comparison can be made with the Java java.lang.reflect API that provides, for any given Java program, a description of the program s classes, fields, and methods. The program is then said to have introspected to obtain information about itself. In the context of AOP, the same principle applies. The joinpoint examines itself to gain information about itself. This mechanism is useful for determining, for instance, the method call that caused the joinpoint to occur.

These like-sounding acronyms are both related to Java EE transaction management. JTA defines application transaction services as well as the interactions among the application server, the transaction manager, and resource managers. Java Transaction Service (JTS) deals with how a transaction manager is implemented. A JTS transaction manager supports JTA as its high-level interface and implements the Java mapping of the OMG Object Transaction Service (OTS) specification as its low-level interface. As an EJB developer, there really is no need for you to deal with JTS.

public class Client { private TopicConnection private TopicSession private TopicPublisher private Topic private TopicConnectionFactory

Container-managed transactions are by far the simplest and most flexible way of managing EJB transactions. We ll take a look at them first.