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As we discussed earlier in section 3.1.2, a session bean must have at least one business interface. The session bean class must be concrete. You cannot define a session bean class as either final or abstract since the container needs to manipulate it. You must have a no-argument constructor in the bean class. As we saw, this is because the container invokes this constructor to create a bean instance when a client invokes an EJB. Note that the compiler inserts a default noargument constructor if there is no constructor in a Java class. A session bean class can subclass another session bean or any other POJO. For example, a stateless session bean named BidManager can extend another session bean PlaceBidBean in the following way:

@Stateless public BidManagerBean extends PlaceBidBean implements BidManager { ... }

Enterprise JavaBeans are well integrated into a transactional API provided by the Java 2 Enterprise Edition (J2EE) platform. Transactions control the permanence of the result from a section of code that creates new data or modifies existing data. Not all applications require transactions, but critical applications must have ways of ensuring that data is consistent for all data clients and that it exists in a predictable way. For example, transactions help remove data modifications made by a failed process. The importance of transactions is clearly demonstrated by imagining what happens when you remove them from critical situations. Imagine a multistep process such as transferring money between two bank accounts money is withdrawn from one account and deposited into a second. A single transaction should control this two-step process in a single event. If one half of the event cannot succeed, then none of it should. If the withdrawal of money succeeds but the deposit fails, then the withdrawal must be reversed (or rolled back). Without transactions, an automated process is prone to self-corruption due to uncorrected errors. In the account example, someone could lose money if a deposit failed and the withdrawal were not reversed. Granted, this is an overly simplified example, but it does illustrate the value of transactions. Just as important, transactions protect data accessors from reading bad data. If a database update fails midway through, you need to remove the already updated data. For example, getting an account balance during a money transfer should reflect only those transfers that have completed successfully, not those in progress because they still might fail. Transactions provide the mechanism for ensuring that data changes and processes run correctly. This chapter contains recipes for EJB transactions and covers the following topics:

The two most common code elements that are introduced by aspects are fields and methods. In relation to methods, interfaces can also be introduced the idea is to let a target class implement a new interface. In some aspect-oriented frameworks, such as JAC (see 4), exception handlers can also be introduced. The idea is to define handlers for exceptions that are not caught by the application. Like the inheritance relationship of OOP, the introduction mechanism allows for the extension of existing classes. However, contrary to inheritance, the introduction mechanism does not allow for the redefinition of existing elements it can only add new ones. This limitation is due to the goal of conserving the program s integrity, especially when several aspects are composed together. Next, we elaborate on the well-known problem of aspect composition.

The business methods and lifecycle callback methods may be defined either in the bean class or in a superclass. It s worth mentioning here that annotation inheritance is supported with several limitations with EJB 3 session beans. For example, the bean type annotation @Stateless or @Stateful specified in the PlaceBidBean superclass will be ignored when you deploy the BidManagerBean. However, any annotations in the superclasses used to define lifecycle callback methods (more about that later in this section) and resource injections will be inherited by the bean class. Business method names must not start with ejb. For example, avoid a method name like ejbCreate or ejbAddBid because it may interfere with EJB infrastructure processing. You must define all business methods as public, but not final or static. If you are exposing a method in a remote business interface of the EJB, then make sure that the arguments and the return type of the method implement the java.io.Serializable interface.