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1.1.4 Why choose EJB 3
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At the beginning of this chapter, we hinted at EJB s status as a pioneering technology. EJB is a groundbreaking technology that has raised the standards of serverside development. Just like Java itself, EJB has changed things in ways that are here to stay and inspired many innovations. In fact, up until a few years ago the only serious competition to EJB came from the Microsoft .NET framework. In this section, we ll point out a few of the compelling EJB 3 features that we feel certain will have this latest version at the top of your short list. Ease of use Thanks to the unwavering focus on ease of use, EJB 3 is probably the simplest server-side development platform around. The features that shine the brightest are POJO programming, annotations in favor of verbose XML, heavy use of
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EJB overview
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sensible defaults, and JPA, all of which you will be learning about in this book. Although the number of EJB services is significant, you ll find them very intuitive. For the most part, EJB 3 has a practical outlook and doesn t demand that you understand the theoretical intricacies. In fact, most EJB services are designed to give you a break from this mode of thinking so you can focus on getting the job done and go home at the end of the day knowing you accomplished something. Integrated solution stack EJB 3 offers a complete stack of server solutions, including persistence, messaging, lightweight scheduling, remoting, web services, dependency injection (DI), and interceptors. This means that you won t have to spend a lot of time looking for third-party tools to integrate into your application. In addition, EJB 3 provides seamless integration with other Java EE technologies, such as JDBC, JavaMail, Java Transaction API JTA (JTA), Java Messaging Service (JMS), Java Authentication and Authorization Service (JAAS), Java Naming and Directory Interface (JNDI), Java Remote Method Invocation (RMI), and so on. EJB is also guaranteed to seamlessly integrate with presentation-tier technologies like JavaServer Pages (JSP), servlets, JavaServer Faces (JSF), and Swing. Open Java EE standard EJB is a critical part of the Java EE standard. This is an extremely important concept to grasp if you are to adopt EJB 3. EJB 3 has an open, public API specification, which organizations are encouraged to use to create a container or persistence provider implementation. The EJB 3 standard is developed by the Java Community Process (JCP), consisting of a nonexclusive group of individuals driving the Java standard. The open standard leads to broader vendor support for EJB 3, which means you don t have to depend on a proprietary solution. Broad vendor support EJB is supported by a large and diverse variety of independent organizations. This includes the technology world s largest, most respected, and most financially strong names, such as Oracle and IBM, as well as passionate and energetic open source groups like JBoss and Geronimo. Wide vendor support translates to three important advantages for you. First, you are not at the mercy of the ups and downs of a particular company or group of people. Second, a lot of people have concrete long-term interests to keep the technology as competitive as possible. You can essentially count on being able to
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What s what in EJB 3
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take advantage of the best-of-breed technologies both in and outside the Java world in a competitive timeframe. Third, vendors have historically competed against one another by providing value-added nonstandard features. All of these factors help keep EJB on the track of continuous healthy evolution. Stable, high-quality code base Although EJB 3 is a groundbreaking step, most application server implementations will still benefit from a relatively stable code base that has lived through some of the most demanding enterprise environments over a prolonged period of time. Most persistence provider solutions like JDO, Hibernate, and TopLink are also stable products that are being used in many mission-critical production environments. This means that although EJB 3 is very new, you can expect stable implementations relatively quickly. Also, because of the very nature of standardsbased development, the quality of EJB 3 container implementations is generally not taken lightly by vendors. To some degree, this helps ensure a healthy level of inherent implementation quality. Clustering, load balancing, and failover Features historically added by most application server vendors are robust support for clustering, load balancing, and failover. EJB application servers have a proven track record of supporting some of the largest high-performance computing (HPC)-enabled server farm environments. More importantly, you can leverage such support with no changes to code, no third-party tool integration, and relatively simple configuration (beyond the inherent work in setting up a hardware cluster). This means that you can rely on hardware clustering to scale up your application with EJB 3 if you need to. EJB 3 is a compelling option for building enterprise applications. In the following sections, we explain more about EJB types and how to use them. We also discuss containers and persistence providers and explore the services they provide. By the time you finish reading sections 1.2 and 1.3, you ll have a good idea of what EJBs are and where they run, and what services they offer. So let s get started!
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