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JSF 20 provides a new feature called the ExceptionHandler This provides a central point of control for handling all unexpected exceptions thrown during the execution of the JSF lifecycle
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JSF 20 TIP With the introduction of the ExceptionHandler, the JSF Expert Group chose to also
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introduce an incompatibility Prior to JSF 20, any exceptions that happened during the processing of PhaseListeners were caught, logged, and swallowed Now such exceptions are caught, processed by the ExceptionHandler, and re-thrown This allows the Servlet <errorpage> to handle the Exception, which is more consistent with the rest of the Web platform Applications desiring the old behavior may have it by adding this text in the <factory> section of the faces-configxml: <exception-handlerfactory> javaxfaceswebappPreJsf2ExceptionHandlerFactory </exception-handlerfactory> The <exception-handler> element may be used to install a custom ExceptionHandler, which will be covered in 9
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3:
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The JavaServer Faces Request Processing Lifecycle
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This chapter has briefly touched on a lot of areas, but you needn t worry about having to understand every single item before you begin building JSF applications Instead, if you are a new JSF developer, it is sufficient to appreciate the JSF request processing lifecycle at a high level, knowing that it does most of the typically tedious (form processing) work for you More advanced JSF developers and aspiring JSF component developers will find that the concepts covered in this chapter provide a solid foundation for moving on to the more advanced topics, including custom component development Before concluding this chapter, here are some key request processing lifecycle concepts to take into the rest of the book: 1 The Faces request processing lifecycle does the busy work for you In fact, that is why it was implemented to take the tedious work of processing request parameter values out of Web application development and let the developer focus more on the application logic 2 New JSF developers needn t know every single detail of the lifecycle to build simple JSF applications Thinking that you have to understand all of the details of the JSF lifecycle is kind of like thinking that in order to drive a car you must understand exactly how an engine works For most drivers, simply knowing that your car occasionally needs gasoline is sufficient However, having some understanding of how an engine works can often come in handy if a breakdown occurs or if you want to make modifications to improve engine performance 3 However, having a firm understanding of the request processing lifecycle provides a great foundation for advanced JSF development As you progress from building JSF applications to building custom JSF components, you ll find that having a complete understanding of the entire request processing lifecycle is extremely helpful so that you will have a complete understanding of what is occurring behind the scenes at all times
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CHAPTER
The Facelets View Declaration Language
his chapter presents a brief but complete guide to using the Facelets View Declaration Language technology, invented as a JSF extension by Expert Group member Jacob Hookom, and now incorporated into the core JSF specification in JSF 20 Facelets was created to replace the use of JSP as a View Declaration Language for JSF, with the following goals in mind: Provide a server-side templating facility that allows composing the actual view from several separate physical pages in a way that maximizes markup code reuse and eliminates redundancy among views Designed entirely with JSF in mind Provide a way to declare a JSF View using standard XHTML syntax Provide an extensible tag library feature Enforce clean Model-View-Controller separation by disallowing the inclusion of Java code in markup pages Templating is the feature of greatest interest to the general JSF developer Most of this chapter is devoted to explaining how to use this feature The more advanced features such as custom tags and tag libraries will be covered in 11
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