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Earlier, we talked about stateful and stateless session beans However, we have so far avoided the real differences between them This grouping of bean types centers on the concept of the conversational state A particular business process may involve more than one session bean method call During these method calls, the session bean may or may not maintain a conversational state This terminology will make more sense if you think of each session bean method call as a conversation, or exchange of information, between the client and the bean A bean that maintains conversational state remembers the results of previous exchanges, and is a stateful session bean In Java terms, this means that the bean will store data from a method call into instance variables and use the cached data to process the next method call Stateless session beans don t maintain any state.

In general, stateful session beans tend to model multistep workflows, while stateless session beans tend to model generalpurpose, utility services used by the client The classic example of maintaining conversational state is the e-commerce website shopping cart When the client adds, removes, modifies, or checks out items from the shopping cart, the shopping cart is expected to store all the items that were put into it while the client was shopping As you can imagine, except for the most complex business processes in an application, most session bean interactions don t require a conversational state Putting in a bid at ActionBazaar, leaving buyer or seller feedback, and viewing a particular item for bid are all examples of stateless business processes As you ll soon see, however, this does not mean that stateless session beans cannot have instance variables.

Note WSE 3.0 has greatly simplified the policy model, compared to the one provided by WSE 2.0. In this

Even before we explore any code, common sense should tell us that session beans must cache some resources, like database connections, for performance reasons The critical distinction here is client expectations As long as the client does not need to depend on the fact that a session bean uses instance variables to maintain conversational state, there is no need to use a stateful session bean..

Summary

A session bean has a lifecycle. This mean that beans go through a predefined set of state transitions. If you ve used Spring or EJB 2, this should come as no surprise. If you haven t, the concept can be a little tricky to grasp.

To understand the bean lifecycle, it is important to revisit the concept of managed resources. Recall that the container manages almost every aspect of session beans. This means that neither the client nor the bean is responsible for determining when bean instances are created, when dependencies are injected, when bean instances are destroyed, or when to take optimization measures. Managing these actions enables the container to provide the abstractions that constitute some of the real value of using EJBs, including DI, automated transaction management, AOP, transparent security management, and so on. The lifecycle events The lifecycle of a session bean may be categorized into several phases or events. The most obvious two events of a bean lifecycle are creation and destruction. All EJBs go through these two phases. In addition, stateful session beans go through the passivation/activation cycle, which we discuss in depth in section 3.3.5. Here, we take a close look at the phases shared by all session beans: creation and destruction. The lifecycle for a session bean starts when a bean instance is created. This typically happens when a client receives a reference to the bean either by doing a JNDI lookup or by using dependency injection. The following steps occur when a bean is initialized:

The container invokes the newInstance method on the bean object. This essentially translates to a constructor invocation on the bean implementation class. If the bean uses DI, all dependencies on resources, other beans, and environment components are injected into the newly created bean instance.

Figure 3.2 depicts this series of events. After the container determines that an instance is no longer needed, the instance is destroyed. This sounds just fine until you realize that the bean might need to know when some of its lifecycle transitions happen. For example, suppose that the resource being injected into a bean is a JDBC data source. That means that it would be nice to be able to know when it is injected so you can open the JDBC database connection to be used in the next business method invocation. In a similar way, the bean would also need to be notified before it is destroyed so that the open database connection can be properly closed. This is where callbacks come in.

In this chapter, I have discussed several implementation details concerning the initialization of the CLR and the CRT in different assembly types. As you have seen, this knowledge is necessary to prevent a range of special problems, most of which are related to the initialization of global variables.