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Today, users expect web applications to work in several browser windows The application leaks memory When a JSF page first tries to resolve the itemEditor variable, a new instance of ItemEditor is bound to the variable in the HTTP session context This value is never cleaned up Even if the user clicks Save on the edit screen, the backing bean instance stays in the HTTP session until the user logs out or the HTTP session times out Imagine that a much more sophisticated application has many forms and many backing beans The HTTP session grows as the user clicks through the application, and replicating the HTTP session to other nodes in a cluster gets more expensive with every click If a user comes back to the item search screen, after working with another module of the application, old data is shown in the forms.

One solution for this problem would be manual cleanup of the HTTP session at the end of a conversation, but there is no easy way to do this With JSF and EJB 30, you must code this manually In our experience, handling variables and values in the HTTP session manually is a common source of issues that are incredibly difficult to track down The flow of the application is difficult to visualize and control How do you know where clicking the Search button will take you At a minimum, you have to look into two files: the backing bean, which returns string outcomes, and the JSF XML configuration file, which defines the page shown for a particular outcome There is also the ever-present problem of the Back button in the browser, a nasty problem in any conversation that has more than two screens Think also about the business process.

Rather than delving into the implementation details of XDoclet, which date rapidly in the open-source world, we cover how XDoclet works from a build file perspective. XDoclet consists of several Ant tasks, each specific to a particular area, such as EJB or web development needs. Each task allows a set of subtasks to be nested within to provide specific generation for the parent tasks context and share configuration.

How can you define that your flow of pages is part of a larger business process Imagine that searching and editing an item is only one task in a business process that involves many more steps for example, as part of a review process No tools or strategies help you integrate business process management in your application Today, you can no longer.

XDoclet s Ant tasks There are several Ant custom tasks built into the XDoclet distribution. Each of these main tasks allow for specific subtasks nested as XML elements. Table 11.2 describes each of XDoclet s Ant tasks and subtasks.

afford to ignore the business processes of which your applications is a part; you need a programming model that supports business-process management. Finally, this application includes too much XML. There is no way around metadata in the application, but not all of it has to be in an XML file. Metadata in XML files is great if it changes independently from code. This may be true for navigation rules, but it probably isn t true for the declaration of backing beans and the context they live in. This kind of metadata grows linearly with the size of your application every backing bean must be declared in XML. Instead, you should put an annotation on your class that says, I m a backing bean for JSF, and I live inside the HTTP session (or any other) context. It s unlikely that your class will suddenly change its role without any changes to the class code. If you agree with this analysis, you ll like Seam.

Table 11.2 Name DocletTask XDoclet s tasks and their supported subtasks. Classname (prefixed by xdoclet.) DocletTask Allowed subtasks <template> <xmltemplate> Subtask Purpose Custom template subtask. Enhanced template capabilities enabling validation of XML generation. General tag HTML reporting (see to-do list generation in section 11.2). XDoclet uses XDoclet to document itself! Generation of many EJB artifacts from vendor-specific deployment descriptors to value objects.

The web application you ve written to search and edit web items can be improved if you add Seam into the mix. You start with basic Seam features: