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Doing so lets you easily identify and extract the EJB classes from the other common classes, and prevents potential naming collisions. For example, if you are working with all EJB implementation classes, a naming collision might arise. If you name your EJB implementation classes using a standard convention, <Name>Bean.java, and operate on all files in our source tree following this convention, you will get plain JavaBeans as well. Storing the EJB files in a separate package lets you filter all source files that follow the naming convention and appear in packages containing the ejb package distinction.
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Table 10.1 EJB classes are much easier to manage when you give them appropriate names. These suggestions are conventions that will help you identify the critical EJB types. With this approach, you will not have to worry about naming collisions, and can easily identify the purpose of an EJB. Class naming convention Remote<Name> Remote<Name>Home Local<Name> Local<Name>Home <Name>Bean Description Remote component interface Remote home interface Local component interface Local home interface Bean implementation
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Before local interfaces came along, most naming conventions did not have the Remote prefix on the class names. Using the separate ejb package for EJB classes allows you to work equally well with these legacy implementations.
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10.1.3 Filling the EJB JAR
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An ejb-jar file is a Java Archive (JAR) file containing the beans implementation classes, home and component interface classes, primary key classes for entity beans, and deployment descriptors. The ejb-jar file must either contain or reference classes on which the EJB depends. The standard EJB deployment descriptor is stored in the META-INF/ejb-jar.xml file. The META-INF directory may contain vendor-specific descriptors as well. The ejb-jar references dependent classes outside of the ejb-jar using the Class-Path attribute in the JAR file s manifest file. For example, if an ejb-jar depends on classes stored in two other JAR files named common.jar and client.jar, the ejb-jar should specify this dependence in the META-INF/MANIFEST.MF file (listing 10.5):
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Listing 10.5
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Example MANIFEST.MF file
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Manifest-Version: 1.0 Class-Path: common.jar client.jar
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Next, you package up each ejb-jar file into another JAR called an enterprise application archive (EAR) file. An EAR file contains one or more ejb-jar and web application archive (WAR) files as well as any other JARs commonly referenced by these EAR components. The EAR file has a descriptor of its own, META-INF/application.xml, which lists all contained EJB and WAR files. The specification also supports an optional EJB client JAR. An EJB client JAR contains the beans home and component interfaces and also contains or references the classes upon which that these interfaces depend, such as custom exceptions. The ejb-jar file references this file in its manifest file s Class-Path attribute. For example, if the bean implementation returns a custom java.util.Map implementation called MyMap, the MyMap class goes in the ejb client JAR file. The interface may say that it returns Map as opposed to MyMap, however the client will still need the MyMap implementation in its classpath at runtime.
10.1.4 Loading classes
How exactly the container loads component classes has long been a source of confusion. Understanding this loading is core to successful, error-free deployment. Java class loaders are required, by specification, to follow a hierarchical architecture, starting with the system class loader at the root. Each class loader has a parent class loader. When asked to load a particular class, the class loader first checks with its parent loader, and if the parent loader cannot load the desired class, the child loader attempts the load itself. A given class loader can see only classes made available to itself and class loaders higher in the hierarchy. This setup enables Java applications to isolate different parts of the application securely. Class loaders in different branches of the class loader hierarchy that is, neither class loader is a parent or ancestor of the other may load different versions of the same class. This technology makes applets possible. Though a web browser only uses a single virtual machine, each applet gets a different class loader, completely isolating classes from different domains. This allows two different domains to load separate versions of the same third-party library and prevents code from one domain from affecting another, maliciously or by accident. The J2EE architecture uses class loaders to deploy multiple enterprise applications into a single virtual machine. In a J2EE application, each EAR file gets a
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