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Table 11.1 lists the archives or modules supported by Java EE 5 and their contents. Note that each archive type is used for packaging a specific type of module, such as EJB or web. For instance, a WAR is used to package a web-tier application module, and the EAR file is intended to be the ber archive containing all the other archives so that in the end, you re only deploying one file. The application server will scan the contents of the EAR and deploy it. We discuss how an EAR is loaded by the server in section 11.1.2.
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Table 11.1 Enterprise Java applications need to be assembled into specific types of JAR files before they can be deployed to an application server. These are the available module types as specified by Java EE. Type CAR Description Client application archives Enterprise application archive EJB Java archive Descriptor application-client.xml Contents Thick Java client for EJBs.
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Other Java EE modules such as EJB-JARs. Session beans, message-driven beans, and optionally entities. Needs a persistence.xml if entities are packaged. Resource adapters.
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Resource adapter archives Web application archives
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Web application artifacts such as servlets, JSPs, JSF, static files, etc. Entities can also be packaged in this module. Needs a persistence. xml if entities are packaged.
To create these files, you can use the jar utility that comes with JDK. The final step is to assemble all the JAR files into one EAR file for deployment. In 11.3.1 we show you a build script that creates a JAR file. Each of these JAR types contains an optional deployment descriptor that describes the archive. As we have been discussing throughout this book, you can use metadata annotations instead of a deployment descriptor. In this chapter, we focus primarily on the EAR file and the EJB -JAR file, which contains the session and message-driven beans, as well as entities. It s worth mentioning that entities can be packaged in most archive types. For example, the ability to package entities in WARs allows you to use the EJB 3 JPA in
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simple web applications or with lightweight frameworks such as Spring. Note that entities are not supported in RAR modules. This statement, however, begs the question of why Java EE does not have a different archive type to package EJB 3 entities, just as JBoss has the Hibernate Archive (HAR) to package persistence objects with Hibernate s O/R framework. You may know the answer to this question if you have followed the evolution of the EJB 3 specification. For those who haven t, we now regale you with Tales from the Expert Group (cue spooky music) During the evolution of the EJB 3 Public Draft, the PAR (Persistence Archive) was introduced, which mysteriously vanished in the Proposed Final Draft. A huge, emotional battle was fought in the EJB and Java EE expert groups over whether to introduce a module type for a persistence module at the Java EE level, and suggestions were sought from the community at large, as well as from various developer forums. Many developers think a separate persistence module is a bad idea because entities are supported both outside and inside the container. Considering that persistence is inherently a part of any enterprise application, it makes sense to support packaging entities with most module types, instead of introducing a new module type specialized for packaging entities. Now that you know what modules are supported and a little about how they were arrived at, shall we take a quick peek under the hood of an EAR module
11.1.1 Dissecting the EAR file
To understand how deployment works, let s take a closer look at the EAR file, the top-level archive file that contains other Java EE archives when it is deployed to the application server. For instance, the ActionBazaar application contains an EJB module, a web module, a JAR containing helper classes, and an application client module. The file structure of the EAR file that ActionBazaar uses looks like this:
META-INF/application.xml actionBazaar-ejb.jar actionBazaar.war actionBazaar-client.jar lib/actionBazaar-commons.jar
application.xml is the deployment descriptor that describes the standard Java EE modules packaged in each EAR file. The contents of application.xml look
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