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In this last chapter, we show you the JBoss Seam framework. Seam is an innovative new framework for web application development with the Java EE 5.0 platform. Seam brings two new standards, JavaServer Faces (JSF) and EJB 3.0, much closer together, by unifying their component and programming models. Most attractive for developers who rely on Hibernate (or any Java Persistence provider in EJB 3.0) is Seam s automatic persistence context management and the first-class constructs it provides for the definition of conversations in the application flow. If you ve ever seen a LazyInitializationException in your Hibernate application, Seam has the right solutions. There is much more to be said about Seam, and we encourage you to read this chapter even if you already made a decision for a different framework or if you aren t writing a web application. Although Seam currently targets web applications and also relies on JSF as a presentation framework, other options should be available in the future (you can already use Ajax calls to access Seam components, for example). Furthermore, many central concepts of Seam are currently being standardized and brought back into the Java EE 5.0 platform with the Web Beans JSR 299 (http://www.jcp.org/en/jsr/detail id=299). There are many ways to explain Seam and equally many ways to learn Seam. In this chapter, we first look at the problems Seam promises to solve; then, we discuss various solutions and highlight the features that are most appealing to you as a Hibernate user.

Property names are left unadorned in target if/unless clauses. In other words, you can simply specify the property name with no ${ }. Only the existence of a property, regardless of value, is taken into consideration for if/unless.

Java EE 5.0 is significantly easier to use and much more powerful than its predecessors. Two specifications of the Java EE 5.0 platform that are most relevant for web application developers are JSF and EJB 3.0. What s so great about JSF and EJB 3.0 We first highlight major concepts and features in each specification. You ll then write a small example with JSF and EJB 3.0 and compare it to the old way of writing web applications in Java (think Struts and EJB 2.x). After that, we ll focus on the issues that are still present and how Seam can make JSF and EJB 3.0 an even more powerful and convenient combination. Note that it s impossible to cover all of JSF and EJB 3.0 in this chapter. We recommend that you read this chapter together with the Sun Java EE 5.0 tutorial (http://java.sun.com/javaee/5/docs/tutorial/doc/) and browse through the tutorial if you want to know more about a particular subject. On the other hand, if

The following lines demonstrate the use of the if attribute to conditionally include source code in a JAR file built:

you ve already had some contact with JSF or EJB 3.0 (or even Hibernate), you ll likely find learning Seam easy.

JSF simplifies building web user interfaces in Java. As a presentation framework, JSF provides the following high-level features:

<target name="init"> <mkdir dir="build/classes"/> <mkdir dir="dist"/> </target> <target name="compile" depends="init"> <javac srcdir="src" destdir="build/classes"/> </target> <target name="copysource" depends="init" if="copy.source"> <copy todir="build/classes"> <fileset dir="src"/>

JSF defines a component programming model for backing beans, or managed beans, which contain the application logic. JSF defines the interaction between the user interface and the application logic and allows you to bind both together in a flexible fashion. JSF allows you to define navigation rules declaratively in XML that is, which page is displayed for a particular outcome in your application logic.

</copy> </target> <target name="jar" depends="compile,copysource"> <jar basedir="build/classes" jarfile="dist/our.jar"> </target>

Let s spend a little more time on each of these features and what makes them useful. JSF defines a set of built-in visual components that every JSF implementation has to support (such as buttons and input text fields). These visual components are rendered on pages as HTML (and Javascript). At the time of writing, several high-quality open source and commercial JSF widget libraries are available. Readymade visual components are great for you as a developer; you don t have to code them by hand, and, most important, you don t have to maintain them or make them work on different browsers (which is especially painful if you need more sophisticated visual components that use Javascript). Pages are created with any HTML templating engine that understands JSF widgets. Although JSP seems like an obvious choice, in our experience it isn t the best. We found that JavaServer Facelets (https://facelets.dev.java.net/) is a perfect fit for building JSF views and creating HTML templates that contain JSF widgets. (Another nice bonus of using Facelets is that you get the new unified expression language for free, even without a JSP 2.1-capable servlet container.) We ll use Facelets in all JSF examples in this chapter. JSF-managed application components, called backing beans, make your web application interface work; they contain the application code. These are regular POJOs, and they re defined and wired together in JSF XML configuration files. This wiring supports basic dependency injection, as well as lifecycle management