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Our example message bean attempts to extract a command string from JMS messages it receives. From this command String, it will start particular business processes in an asynchronous manner. As you can tell from this recipe, you should consult your application server s documentation for the specific way it maps message-driven beans to actual JMS topics and messages. In this example, for Weblogic we needed to create an additional XML file for the message-driven bean that specifies the actual JMS topic for the EJB. This recipe shows only a small subset of the message-driven EJB capability. When developing message-driven beans, you should consider delegating business logic to other objects rather than tying it to a particular bean. This will allow you to use particular business logic in other places and not tie it to the message-driven behavior. You can read more about this idea in chapter 6.

Spring MVC applications are highly testable, due to their use of interfaces, Dependency Injection techniques, and decoupled designs. Both unit and integration tests can easily be written to test not only the domain model, but all layers of the application. The Spring Framework provides many classes inside spring-mock.jar to help with test creation and management. In combination with mock objects, the tests for your web components and other layers can provide immediate feedback for new features and refactorings. This leads to higher confidence in the system, and thus a greater ability to adapt the system to growing needs and requirements. Above all, remember that tests should always run fast, whether you are testing a simple POJO or a complex web Controller. Tests that run fast are tests that are built and run during development, when they can catch issues earliest.

The next command is the central one for handling the input of the script.2 Here each character the user enters is assigned to the Keypress variable.

One way to improve the performance of the client layer of an EJB application is to avoid repeated JNDI lookup calls to find an EJB. One of the best ways to do this is to save the EJB reference in a persistent format once the client looks it up. Saving a reference to an EJB means creating an object that can rebuild the connection to the EJB object in the EJB container.

his chapter will provide a high-level introduction to Spring Web Flow, a framework for managing complex page navigation and conversational scope within web applications. At the end of this chapter you will Understand the motivation for Spring Web Flow Be familiar with the terms and concepts within Spring Web Flow

Keypress=$(head -c1) # Keypress=$(dd bs=1 count=1 2> /dev/null)

Use an instance of the Handle class as the saved reference. Since EJB handles are serializable, we can persist them using an object output stream for later retrieval and use. The EJB specification designed the handle with this in mind. The client code in listing 1.12 implements a method, saveReference(), that persists a handle to an EJB.

Today, the Java Servlet specification (http://www.jcp.org/aboutJava/communityprocess/ final/jsr154) provides developers with a standard for processing HTTP requests within a web application. The specification defines three different scopes that dictate the visibility and location of objects and attributes that are associated with request processing. Table 11-1 lists the existing scopes from the server s perspective as we know them today. Table 11-1. Servlet Scopes

public class ClientSaver { private String url; private HelperHome home; public void runExample() { home = retrieveHelperHome(); Helper goodHelper = null; try { goodHelper = (Helper) PortableRemoteObject.narrow( home.create(), Helper.class); saveReference( goodHelper );

1. Trajectory calculations can be found at http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html. 2. Thanks to Stephane Chazelas, who supplied the keypress-detection code found on http://tldp.org/ LDP/abs/html/system.html.

Has the smallest lifetime, is unique to each request from a browser, and will be discarded when the view is returned to the browser. Starts as soon as each unique browser accesses the server, and ends if the server hasn t received a request from that browser within a specified timeout (default of 30 minutes) or if explicitly destroyed. This scope allows objects to live across requests. Lives for the duration of the web application deployment.

} private void saveReference( Helper helper ) { FileOutputStream ostream = null; ObjectOutputStream objStream = null; try{ ostream = new FileOutputStream( "Helper.obj" ); objStream = new ObjectOutputStream( ostream ); objStream.writeObject( helper.getHandle() ); objStream.flush(); objStream.close(); } catch(Exception e){ e.printStackTrace(); } } }

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