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he preceding definition1 of seam is usually used when discussing sewing. However, this definition also fits the latest in frameworks from JBoss JBoss Seam. JBoss Seam is a framework that brings together existing Java Platform, Enterprise Edition (Java EE) standards to enable them to work as an integrated solution. At its core, the Seam framework ties the Enterprise JavaBeans 3 (EJB3) and JavaServer Faces (JSF) specifications. However, Seam does not just stop there it will also join together other component models that you may be used to, such as jBPM, Drools, and more that we will get into as the book progresses. When I mentioned EJB, you may have been taken aback with fear or may have started shaking your head profusely. Although EJB 2.1 had some negative connotations, especially regarding the way it relates to stateful session beans (SFSBs) and entity beans (EBs), any negative feelings about it should be reexamined today. With the new EJB3 specification, EJBs have become lightweight plain old Java objects (POJOs) that do not require as much of the plumbing as before. Hopefully those of you who may harbor negative feelings toward EJB3 will review and revise those feelings as you see how Seam enables you to not only cut development time but also more clearly separate your business logic and presentation tiers by cutting out the connecting code (for example, Struts actions) normally associated with web frameworks. For years developers realized that the JavaServer Pages (JSP)/servlets paradigm was not enough to create enterprise-level web pages. That model provided the capability for a web tier that could pass objects from the client to the server, but essentially that was it. For most developers, this simple paradigm was not enough; more-complex operations were needed, and developers found themselves writing infrastructure code to deal with

You can use the Colleagues tab in the Add Connections screen to easily find colleagues based on the companies you ve listed in your profile. To start, click the Contacts link, shown in Figure 13-9.

The EJB 3 JPA introduces the persistence.xml deployment descriptor, shown in Listing 10-15, to represent groups of entities called persistence units. A persistence unit has a few properties that we need to define. The list of entities that are within the scope of a persistence unit may be specified explicitly, or this information may be left unspecified. In the latter case, all entities defined in the persistence archive (JAR file) or on the classpath are included in the persistence unit by default.

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the shortcomings of the Servlet specification. Eventually, all the ideas learned from creating custom infrastructure code resulted in the web frameworks we know today, such as Apache s Struts and Tapestry, OpenSymphony s WebWork, and so forth. The Java community also got together and through the Java Community Process (JCP) created the JSF specification to tackle some of the issues raised and deal with the shortcomings of the Servlet specification. Even though we now have web and business tiers with improved functionality, we have still been forced to create the plumbing code needed to connect them together. With Seam, however, these two areas can now focus more exclusively on what they do best presentation and business logic.

Figure 13-9. The Contacts link Then, click the Add Connections link, shown in Figure 13-10.

< xml version="1.0" encoding="windows-1252" > <persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"> <persistence-unit name="Ch10_EJB30_MigrationExamples"> <jta-data-source>jdbc/ejb3bookDS</jta-data-source> </persistence-unit> </persistence>

component to component. Not only that, but there was no clear path in the creation of components that would serve multiple types of presentation tiers (web pages, applets, and so forth). The other major idea introduced in JSF was the mechanism to deal with incoming requests. Although the Servlet specification allowed for incoming requests, in reality it was not the best place to handle them. Unfortunately, many developers ended up using servlets to specifically interact with their business logic tier pieces. Frameworks such as Struts started this abstraction away from using servlets but still failed in that they always exposed the HttpServletRequest and HttpServletSession objects to their Action(s) (as you saw in the previous chapter). The JSF specification allows you to have presentation components be POJOs. This creates a cleaner separation from the servlet layer and also makes it easier to do testing by not requiring the POJOs to be dependent on the servlet classes.

The descriptor specifies a name for the <persistence-unit> ("Ch10_EJB30_Migration Examples") and an associated <jta-data-source>. The data source specifies the details of the database connection required by the entities in this persistence unit. This database connection must be defined as a resource in your application server. This task may be

You re directed to the Add Connections screen, shown in Figure 13-11.

performed through your application server s administration console, or it may be defined during deployment using platform-specific deployment descriptors.

Figure 13-11. The Add Connections screen On the Add Connections screen, click the Colleagues tab, shown in Figure 13-12.

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