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An input error occurs when input into your application (from an external source) is not of the expected form. For example, suppose the application is required to open a file that it expects to be in JPG format, but it finds the file to be in a different format. Alternatively, consider when the application has a web form that invites the user to enter a date of birth, but the user types a meaningless value instead. These are input errors. Input errors can and do happen. Moreover, input errors occur at runtime, so no compiler will be able to help find them. You can deal with input errors only by anticipating the type of input errors that might happen and preparing your code to be able to handle them. As you will see in this chapter, the .NET Framework provides an exception-based mechanism that allows you to code your applications to handle input errors properly and recover from them gracefully. An effective way to detect potential input errors, as well as many of the semantic errors that cannot be detected by a compiler, is to test the application. (Testing is discussed in 12.) However, the testing process is only half the story. You can test an application to confirm that it is not working as you expected. But testing, in itself, doesn t tell you much about where the error is and or how to fix it. That s why you also need debugging.

The Hello World example in chapter 2 introduced you to Hibernate; however, it isn t very useful for understanding the requirements of real-world applications with complex data models. For the rest of the book, we ll use a much more sophisticated example application an online auction system to demonstrate Hibernate. In this chapter, we start our discussion of the application by introducing a programming model for persistent classes. Designing and implementing the persistent classes is a multistep process that we ll examine in detail. First, you ll learn how to identify the business entities of a problem domain. We create a conceptual model of these entities and their attributes, called a domain model. We implement this domain model in Java by creating a persistent class for each entity. (We ll spend some time exploring exactly what these Java classes should look like.) We then define mapping metadata to tell Hibernate how these classes and their properties relate to database tables and columns. This involves writing or generating XML documents that are eventually deployed along with the compiled Java classes and used by Hibernate at runtime. This discussion of mapping metadata is the core of this chapter, along with the in-depth exploration of the mapping techniques for fine-grained classes, object identity, inheritance, and associations. This chapter therefore provides the beginnings of a solution to the first four generic problems of ORM listed in section 1.4.2, Generic ORM problems. We ll start by introducing the example application.

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The best use of constant mapping depends on the situation and requirements you are developing against. Examine the likelihood of change within the scenario where you are looking to apply the functoid constant. If there is a high likelihood that values and their application will change, consistency should be the major factor to facilitate maintenance. If constants are set via deterministic logic or complex or embedded business rules, it might be worth thinking about whether the constant should be applied in the map or applied within a scripting component or upstream/downstream BizTalk artifacts. The key is understanding where rules and

Debugging is the process of finding and fixing errors that can t be caught by the compiler. It s very common to associate the debugging process with the use of a debugger a piece of software designed to help you find and fix bugs but there are other ways to debug applications. In this section, we ll look at some alternative debugging techniques that .NET provides through the classes in the System.Diagnostics namespace and through the more specific ASP .NET tracing features. We ll also perform a useful debugging demonstration that doesn t use any debugger software at all. Finally, we ll introduce the powerful VS .NET debugger, and we ll do some debugging of the Friends Reunion application.

The CaveatEmptor online auction application demonstrates ORM techniques and Hibernate functionality; you can download the source code for the entire working application from the web site http://caveatemptor.hibernate.org. The application will have a web-based user interface and run inside a servlet engine like Tomcat. We won t pay much attention to the user interface; we ll concentrate on the data access code. In chapter 8, we discuss the changes that would be necessary if we were to perform all business logic and data access from a separate business-tier implemented as EJB session beans. But, let s start at the beginning. In order to understand the design issues involved in ORM, let s pretend the CaveatEmptor application doesn t yet exist, and that we re building it from scratch. Our first task would be analysis.

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