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The notion of the aspect is an abstract concept that, like the notion of the object, can be applied to different languages Tools of varying completeness exist to support AOP in C, C++, C#, and Smalltalk Furthermore, any existing language could be extended to support the concepts of AOP Because the concept of the aspect is relatively new, encouraging a large community of developers to adopt AOP is an important task..

facade. When you re creating an EJB application, it is essential to know how to contact other EJBs in the same EJB container. Solving this problem requires you to know how to find another bean in the same container.

Software is organic. Much like carbon-based life forms, software grows and evolves. Features die. New features are born. Release numbers keep adding up like the rings of a healthy tree. EJB is no exception to the rule of software evolution. In fact, as far as technologies go, the saga of EJB is more about change than it is about stagnation. Only a handful of other technologies can boast the robust metamorphosis and continuous improvements EJB has pulled off. It s time to catch a glimpse of the new incarnation of EJB, starting with an example of a simple stateless session bean and then revealing the features changes that make EJB an easy-to-use development tool. To explore the new features of EJB 3, we ll be pointing out some of the problems associated with EJB 2. If you are not familiar with EJB 2, don t worry the important thing to remember is how the problems have been resolved in EJB 3. The problems associated with EJB 2 have been widely discussed. In fact, there have been entire books, such as Bitter EJB (Manning Publications, 2003) written about this topic. Chris Richardson in POJOs in Action rightfully identified the amount of sheer code you had to write to build an EJB:

You must write a lot of code to implement an EJB You must write a home interface, a component interface, the bean class, and a deployment descriptor, which for an entity bean can be quite complex. In addition, you must write a number of boilerplate bean class methods that are never actually called but that are required by the interface the bean class implements. This code isn t conceptually difficult, but it is busywork that you must endure.

To invoke a method from another EJB in the same container, from the client EJB, add a method for looking up the home object of the needed EJB. For example, the method shown in listing 1.1 looks up the home object, PasswordHome, for the PasswordBean EJB.

In this section, we d like to walk through some of those points and show you how they have been resolved in EJB 3. As you will see, EJB 3 specifically targets the thorniest issues in EJB 2 and solves them primarily through bold adoption and clever adaptation of the techniques widely available in popular open source solutions such as Hibernate and Spring. Both of which have passed the market incubation test without getting too battered. In many ways, this release primes EJB for even further innovations by solving the most immediate problems and creating a buffer zone for the next metamorphosis. But first, let s look at a bit of code. You will probably never use EJB 2 for building simple applications such as Hello World. However, we want to show you a simple EJB implementation of the ubiquitous Hello World developed using EJB 3. We want you to see this code for a couple reasons: first, to demonstrate how simple developing with EJB 3 really is, and second, because this will provide context for the discussions in the following sections and make them more concrete.

Viewed as a programming paradigm, you can see AOP as OOP s successor. However, the aim of AOP is not to replace OOP, but to complement it, allowing you to create clearer and better-structured programs. Since the introduction of assembly language, a family of programming paradigms has been developed that allows programmers to create software of increasing complexity. The concepts of the procedure and the object have, each in their own ways, contributed to better