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In this chapter, we covered basic messaging concepts, JMS, and MDBs. Messaging is an extremely powerful technology for the enterprise, and it helps build loosely coupled systems. JMS allows you to use message-oriented middleware (MOM) from enterprise Java applications. Using the JMS API to build a message consumer application can be time consuming, and MDBs make using MOM in a standardized manner through Java EE extremely easy. Note, however, that messaging and MDBs are not right for all circumstances and can be overused. One such case is using the request/reply model (discussed in the sidebar The request-reply model ), which entails a lot of extra complexity compared to simple PTP or pub-sub messaging. If you find yourself using this model extensively and in ways very close to synchronous messaging, it might be worth thinking about switching to a synchronous technology such as RMI, SOAP, or remote session bean calls. A few major EJB features we touched on in this chapter are dependency injection, interceptors, timers, transaction, and security. As you ve seen, EJB 3 largely relieves us from these system-level concerns while providing extremely robust and flexible functionality. We ll discuss dependency injection, timers, and interceptors in the next chapter.

This leads to another important task you need to supply a way for new users to register The result of registration is to add a new customer to your database, including username and password hash information To implement this scheme in your application, you ll complete the following tasks: Create two new database tables, the first called customer to hold customer details, and the second called shipping_region, which stores possible shipping regions that a customer can reside in Implement the associated methods in data and business tiers that add, modify, and retrieve information from customer and shipping_region..

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Create a web application by using web server controls, event handlers, application state, and session state. Create websites that take advantage of master pages, themes, and cascading style sheets. Use the wide variety of controls that ship with ASP.NET, including those for validation, navigation, user input, data binding, and much more. Create user controls and custom web server controls. Create a web application that stores user-specific information and preferences. Develop accessible web applications that can be used by a global audience. Write rich Internet applications (RIAs) by using client script, Asynchronous JavaScript and XML (AJAX), and jQuery. Connect your web applications with data by using Microsoft ADO.NET, Microsoft Language-Integrated Query (LINQ) queries, LINQ to SQL, the Entity Framework, and more. Write template-driven, data-bound websites by using Dynamic Data in ASP.NET. Monitor, troubleshoot, and debug ASP.NET applications. Build service-oriented applications (SOAs) by using Hypertext Transfer Protocol (HTTP) handlers and modules, web services, and Windows Communication Foundation (WCF). Add authentication and authorization features to your application to improve security and add multiple access levels. Build websites based on the ASP.NET MVC 2 framework.

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