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An instance of EditItem is managed by Seam in the conversation context, as a value of the contextual variable itemEditor.

<java classname="org.example.antbook.ant.lucene.HtmlDocument"> <arg value="test/org/example/antbook/ant/lucene/test.html"/> <classpath refid="test.classpath"/> </java>

A POJO needs the EJB 30 @Stateful annotation to become a stateful session bean The EJB 30 container injects an EntityManager with a fresh persistence context into this bean, before a method is called by any client of the bean The persistence context is closed when the method returns (assuming this method call is also the scope of a system transaction, which is the default here) This stateful component holds state internally, in the fields itemId and item The state is exposed with property accessor methods A Seam @Begin annotation marks a method that begins a long-running conversation If a JSF action triggers a call to this method, Seam maintains the state of this component across HTTP requests The doSearch() method returns a string outcome (or null) and generates a JSF message that can be rendered on a page The Seam FacesMessages helper makes this message-passing easy.

Writing main method checks is convenient because all Java IDEs provide the ability to compile and run the class in the current buffer, and certainly have their place for exercising an object s capability. There are, however, some issues with this approach that make it ineffective as a comprehensive test framework: There is no explicit concept of a test passing or failing. Typically, the program outputs messages simply with System.out.println; the user has to look at this and decide if it is correct. main has access to protected and private members and methods. While you may want to test the inner workings of a class may be desired, many tests are really about testing an object s interface to the outside world. There is no mechanism to collect results in a structured fashion. There is no replicability. After each test run, a person has to examine and interpret the results. The JUnit framework addresses these issues, and more.

A Seam @End annotation marks a method that ends a long-running conversation If a JSF action triggers a call to this method, and the method returns, Seam will destroy the component s state and no longer maintain it across HTTP requests The Seam @Destroy annotation marks the method that is called by Seam when the component state has to be destroyed (when the end of the conversation has been reached) This is useful for internal cleanup (there is nothing to do in this case) The EJB 30 @Remove annotation marks the method that a client (Seam, in this case) has to call to remove the stateful session bean instance These two annotations usually appear on the same method Why don t you mark the doSave() method with @End, @Destroy, and @Remove The doSave() method might throw an exception, and this exception has to roll back any system transaction.

Seam, however, logs and swallows any exception thrown by its @Destroy method, so you frequently see empty destroy methods in stateful Seam components Furthermore, the component instance is needed for a little while after the saving of an item, to render a response This EJB implementation encapsulates all application logic; there is no more Java code anywhere else (well, there is the Item entity class) If you ignore trivial code, the application logic is only four lines in the two action methods Two more changes are necessary to make the application work Some value bindings in editxhtml need to be modified, and the block of XML that defined the old JSF backing bean can be removed from faces-configxml..

JUnit is a member of the xUnit testing framework family and now the de facto standard testing framework for Java development. JUnit, originally created by Kent Beck and Erich Gamma, is an API that enables developers to easily create Java test cases. It provides a comprehensive assertion facility to verify expected versus actual results. For those interested in design patterns, JUnit is also a great case study because it is very pattern-dense. Figure 4.1 shows the UML model. The abstract TestCase class is of most interest to us.

In the Users mapping you have:

<Test> run(TestResult)

<set name="billingDetails" inverse="true"> <key column="USER_ID"/> <one-to-many class="BillingDetails"/> </set>