By Mike Keith
Company JavaBeans 3.0 (EJB 3.0) is a crucial component to the hot Java company variation five platform (previously referred to as J2EE). they're used for the advance and deployment of component-based company enterprise functions. Ever for the reason that its first liberate, EJB has been the topic of a lot media awareness and no little controversy. EJBs signify a worldly and robust know-how and EJB-based purposes can aid excessive numbers of transactions and clients, with greatest protection. notwithstanding, past incarnations of EJB have become seemed via many as a very advanced know-how which can bring about expensive and time-consuming options which are tricky to construct, enforce and keep. EJB three is determined to alter all that. It has made large advances in ease of improvement, and its vastly simplified programming version has been commonly acclaimed and embraced. on the center of the hot EJB three spec is an incredible relief within the complexity of the EJB patience and object-relational mapping mechanisms (essentially the entity beans part of the specification). This booklet offers the definitive advisor to the EJB three patience know-how. The lead writer, Mike Keith, is a co-lead at the EJB 3.0 professional team (under JSR 220) and offers unprecedented perception and services in this subject. He and his co-authors dissect and clarify the recent EJB three endurance specification in complete element, describing tips to use this refined know-how to its complete strength. Assuming a easy wisdom of Java, SQL, JDBC and a few J2EE event, this ebook teaches you EJB three endurance from the floor up. It presents the reader with an entire and in-depth knowing of the EJB 3.0 patience API and the way to exploit it in perform.
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Why is this better than simply using Object everywhere where T is used? The reason is because once the type is supplied and the Holder is instantiated to be of a given type, then only instances of that type will be allowed to be stored. This makes any given Holder instance strongly typed for the type of our choice. setContents(101); // compile error We have a Holder that stores String objects or anything we want, but once we define it then we get the strong compile-time type checking that frees us from having to type-check at runtime.
Although object-relational mapping is a major component of the API, it also offers solutions to the architectural challenges of integrating persistence into scalable enterprise applications. In the following sections we will look at the evolution of the specification and provide an overview of the major aspects of this technology. History of the Specification The Java Persistence API is remarkable not only for what it offers developers but also for the way in which it came to be. 0. The Early Years It may come as a surprise to learn that object-relational mapping solutions have been around for a long time, longer even than the Java language itself.
The chapter will conclude by showing a simple working application that runs in a standard Java SE 5 environment and that demonstrates all of the example code in action. Entity Overview The entity is not a new thing. In fact, entities have been around longer than many programming languages and certainly longer than Java. 1 He described entities as things that have attributes and relationships. The expectation was that the attributes were going to be persisted in a relational database, as were the relationships.
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