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From the Library of sam kaplan generate, create none none on none pdf-417 generation 33.3 INTEGRATING GROOVY ISSN The code snippet above comes from the Groovy Time-Tracking example and demonstrates how Groovy compilation can be added to your Ant build. Ensure that the groovy-all.jar archive is included in the classpath and de ne the org.


Groovyc task de nition. Once the task is de ned, the groovyc task is executed against the directory where Groovy classes have been de ned (the src directory)..

Joint Compilation none for none Note that the task de nition shown here only provides compilation of Groovy classes. This requires that all Java classes that a Groovy class depends on be precompiled when Groovy compilation occurs, and vice versa. The groovyc task provides the capability to intermix Groovy and Java classes without constraint through joint compilation.

See the documentation of the groovyc task for con guration details.. Using Groovy with Seam-gen When using a seam-gen application with Groovy, place your .groovy les in the src/hot folder to gain hot-deployment support. This provides a truly RAD approach to using Groovy (no pun intended), as Groovy classes are interpreted at runtime.

Note that Groovy classes should always be compiled for production use or performance testing, as interpretation is quite expensive. For more information on seam-gen refer to 5..

Whether you are u none none sing seam-gen or including compiled Groovy bytecode, the Groovy runtime must be made available in the classpath during execution. This simply requires including a groovy-all.jar archive into the WAR or EAR you deploy:.

<target name=" ear"> <mkdir dir="${build.jars}"/> <ear destfile="${build.jars}/${projname}.

ear" appxml="${resources}/META-INF/application.xml"> <fileset dir="${build.jars}" includes="*.

jar, *.war"/> <metainf dir="${resources}/META-INF"> <include name="jboss-app.xml" /> </metainf> <fileset dir="${lib}"> <include name="jboss-seam.

jar"/> ...


<include name="groovy-all.jar" /> </fileset> </ear> </target>. The above task ge none for none nerates an EAR archive and includes the groovy-all.jar. Now the Groovy runtime environment will be available to the Groovy classes during execution.

. From the Library of sam kaplan This page intentionally left blank From the Library of sam kaplan Introduction to Web Beans Seam has evolved web development in the Java EE environment, and now Web Beans is poised to revo none none lutionize it. The Web Beans speci cation (JSR-299) is a collaborative community effort heavily in uenced by Seam and Guice (

com/p/ google-guice). Web Beans not only intends to standardize many of the concepts introduced by these frameworks, but improves on them to de ne the next-generation web development model. In The Web Beans Manifesto (http://relation.

to/Bloggers/ TheWebBeansManifesto) the speci cation lead, Gavin King, described the theme of Web Beans as loose coupling with strong typing. Loose coupling provides the dynamic behavior that makes a system exible. Unfortunately, loose coupling is often achieved by sacri cing type safety.

XML con guration is by far the worst culprit in most frameworks, but even Seam sacri ces type safety with its injection constructs by relying on component names. So, how can we achieve loose coupling while maintaining type safety This is a core objective of the Web Beans component model. Web Beans will standardize a type-safe component model that applies across application tiers.

This nally uni es the web tier and the EJB tier which greatly simpli es Java web development. Much of the component model will feel very familiar now that you have learned the component model of Seam, but you will notice that the Web Beans model introduces additional type safety as well as powerful new constructs. Throughout the chapter, we will take a look at what Web Beans provides by revisiting the Hotel Booking example.

. From the Library of sam kaplan CHAPTER 34 INTRODUCTION TO WEB BEANS 34.1 Defining a Web Beans Component Web Beans provide none none s a container that injects any necessary dependencies at runtime, based on the current context (Figure 34.1). Notice that we mention the context here as with Seam, when injecting components or values, context counts!.

The current Hotel is provided by Web Beans from the context for booking. Without any furth none for none er delay, let s take a look at our rst Web Beans component. The listing below declares the HotelSearchingAction from the Hotel Booking example we saw previously as a Web Beans component:. @Production // De ployment Type @Named("hotelSearching") // Component Name @ConversationScoped // Context Scope @Stateful public class HotelSearchingAction implements HotelSearching { // ...


. The rst annotati none for none on looks a bit foreign to a Seam user, but its behavior is quite familiar. The @Production annotation is a deployment type. Deployment types, rst and foremost, identify classes as Web Beans components.

By annotating HotelSearchingAction with @Production, we are identifying it as a component. In addition, deployment types specify install precedence and environment availability similar to the @Install annotation provided by Seam, which we discussed in Section 7.2.

1. As with Seam, this allows you to override components provided by the Web Beans implementation, by a framework, or even application components for the purpose of testing. The @Production annotation is the annotation provided for use with your components, but it is quite simple to specify your own deployment types with the @DeploymentType annotation.

Note that any custom deployment types must also be enabled in the web-beans.xml le which we will discuss shortly. The @Named annotation gives this component a name.

As with Seam, this component can now be referenced by name through EL. For example, should we.
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