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Renaissance of EJB
Table 1.1 Major EJB 3 component services and why they are important to you. The persistence services are provided by the JPA provider. (continued) Service Web services Applies To Stateless session beans Entities What It Means for You EJB 3 can transparently turn business components into robust web services with minimal code change. Providing standards-based, 100 percent configurable automated persistence as an alternative to verbose and error-prone JDBC/SQL code is a principal goal of the EJB 3 platform. In addition to automating persistence, JPA transparently provides a number of services geared toward data caching, performance optimization, and application tuning. These services are invaluable in supporting medium to large-scale systems.
Persistence
Caching and performance
Entities
1.4 Renaissance of EJB
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.
What s what in EJB 3
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.
1.4.1 HelloUser Example
Hello World examples have ruled the world since they first appeared in The C Programming Language by Brian Kernighan and Dennis Ritchie (Prentice Hall PTR, 1988). Hello World caught on and held ground for good reason. It is very well suited to introducing a technology as simply and plainly as possible. While almost every technology book starts with a Hello World example, to keep things lively and relevant we plan to deviate from that rule and provide a slightly different example. In 2004, one of the authors, Debu, wrote an article for the TheServerSide.com in which he stated that when EJB 3 was released, it would be so simple you could write a Hello World in it using only a few lines of code. Any experienced EJB 2 developer knows that this couldn t be accomplished easily in EJB 2. You had to write a home interface, a component interface, a bean class, and a deployment descriptor. Well, now that EJB 3 has been finalized, let s see if Debu was right in his prediction (listing 1.1).
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