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here you'll discover fewSeam provides a link of example applications demonstrating how to use the various features of Seam.

This tutorial will guide you through a few of those examples to help you get started learning Seam. The Seam examples are located in the examples subdirectory of the Seam distribution. Each example has the very similar directory structure which is based on Maven project structure defaults:.

The example applications run on JBoss AS 7. The following sections will explain the procedure. Note that all the examples are built and run from the Maven pom. At the time of writing this text recent version of Maven was 3.

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The examples are configured for use on JBoss AS 7. Once you've set the location of JBoss AS and started the application server, you can build any example by typing mvn install in the example root directory. Type in that submodule mvn jboss-as: If the example folder begins source seam, the prefix "seam" is ommitted. Several of the examples can only be deployed as a WAR.

Those examples are groovybooking, hibernate, jpa, and spring. Most link the examples come with a suite of Arquillian JUnit integration tests. The registration example is a simple application that lets a new user store his username, real name and password in the database.

The example isn't intended to show off all of the cool functionality of Seam. The start page displays a very basic form with three input fields. Try filling them in and then submitting the form.

This will save a user object in the database. The example is implemented with two Facelets templates, one entity bean and one stateless session bean. Let's take a look at the code, starting from the "bottom". We need an JPA entity bean for user data. This class defines persistence and validation declaratively, via annotations.

It also needs some extra annotations that define the class as a Seam component. A Seam component needs a component name specified by the Name annotation.

This name must Jboss Seam Developer Resume unique within the Seam application. When JSF asks Seam to resolve a context variable with Jboss Seam Developer Resume name that is the same as a Seam component Jboss Seam Developer Resume, and the context variable is currently undefined nullSeam will instantiate that component, and bind the new instance to the context variable. Whenever Seam instantiates a component, it binds the new instance to a context variable in the component's default context.

The default context is specified using the Scope annotation. The User bean is a session scoped component. All of our persistent attributes define accessor methods. These are needed when this component is used by JSF in the render response and update model values phases. Seam integrates Bean Validation through Hibernate Validator, which is the reference implementation, and lets you use it for data validation even if you are not using Hibernate for persistence.

The JPA standard Id annotation indicates the primary key attribute of the entity bean. The most important things to notice in this example are the Name and Scope annotations. These annotations establish that this class is a Seam component. We'll see below that the properties of our User class are bound directly to JSF components and are populated by JSF during the update model values phase. We don't need any tedious glue code to copy data back and forth between the JSF pages and the entity bean domain model.

However, entity beans shouldn't do transaction management or database access.

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So we can't use this component as a JSF action listener. For that we need a session bean. We have exactly one JSF action in our application, and one session bean method attached to it. In this case, we'll use a stateless session bean, since all the state associated with our action is held by the User bean. The EJB Stateless annotation marks this class as a stateless session bean. The In annotation marks an attribute of the bean as injected by Seam.

In this case, the attribute is injected from a context variable named user the instance variable name. The Seam Logger annotation is used to inject the component's Log instance.

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Note that, since this is a session bean, a transaction is automatically begun when the register method is called, and committed when it completes. JSF action listener methods return a string-valued outcome that determines what page will be displayed next.

A null outcome or a void action listener method redisplays the previous page. For complex application this indirection is useful and a good practice.

However, for very simple examples like this one, Seam lets you use the JSF view id as the outcome, eliminating the requirement for a navigation rule. Note that when you use a view id as an outcome, Seam always performs a browser redirect. Seam provides a number of built-in components to help solve common problems.

The FacesMessages component makes it easy to display templated error or success messages. As of Seam 2. Built-in Seam components may be obtained by injection, or by calling the instance method on the class of the built-in component. Note that we did not explicitly specify a Scope this time. Each Seam component type has a default scope if not explicitly specified. For stateless session beans, the default scope is the stateless context, which is the only sensible value.

Our session bean action listener performs the business and persistence logic for our mini-application. In more complex applications, we might need require Jboss Seam Developer Resume separate service layer.

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This is easy to achieve with Seam, but it's overkill for most web Article source. Seam does not force you into any particular strategy for application layering, allowing your application to be as simple, or as complex, as you want. Note that in this simple application, we've actually made it far more complex than it needs to be.

If we had used the Seam application framework controllers, we would have eliminated all of our application code. However, then we wouldn't have had much of an application to explain. The view pages for a Seam application could be implemented using any technology that supports JSF. In this example we use Facelets, because we think it's better than JSF. Since this is the first Seam app we've seen, we'll take a look at the deployment descriptors. Before we get into them, it is worth noting that Seam strongly values minimal configuration.

These configuration files will be created for you when you create a Seam application. You'll never need to Jboss Seam Developer Resume most of these files. We're presenting them now only to help you understand what all the pieces in the example are doing. If you've used many Java frameworks before, you'll be used to having to Jboss Seam Developer Resume all your component classes in some kind of XML file that gradually grows more and more unmanageable as your project matures.

You'll be relieved to know that Seam does not require that application components be accompanied by XML. Most Seam applications require a very small amount of XML that does not grow very much as the project gets bigger. Nevertheless, it is often useful to be able to provide for some external configuration of some components particularly the components built in to Seam.

You have a couple of options article source, but the most flexible option is to provide this configuration in a file called components. We'll use the components. This code configures a property named jndiPattern of a built-in Seam component named org. The funny symbols are there because our Maven build puts the correct JNDI pattern in when we deploy the application, which it reads from the components.

Eclipse M2e Web tools plugin can't use the for token property filtering. The presentation here for our mini-application will be deployed in a WAR.

So we'll need a web deployment descriptor. The configuration you see here is pretty much identical in all Seam applications. Most Seam applications use JSF views as the presentation layer. So usually we'll need faces-config. In our case, we are going to use Facelets for defining our views, so we need to tell JSF to use Facelets as its templating engine.

Our managed beans are annotated Seam components. So basically we don't need faces-config. In fact, once you have all the basic descriptors set up, the only XML you need to write as you add new functionality to a Seam application is orchestration: Seam's stand is that process flow and configuration data are the only things that truly belong in XML. In this simple example, we don't even need a navigation rule, since we decided to embed the view id in our action code. In this case, enables automatic schema export at startup time.

Finally, since our application is deployed as an EAR, we need a deployment descriptor there, too.

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When the form is submitted, JSF asks Seam to resolve the variable named user. Since there is no value already bound to that name in any Seam contextSeam instantiates the user component, and returns the resulting User entity bean instance to JSF after storing it in the Seam session context.

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