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With the form bean created, and the DataBinder created with custom PropertyEditors registered, the request parameters are now bound to the form bean. The binding process will also capture any binding errors, such as type conversion errors or any configured required fields. Of course, most forms require more complicated validation than what is provided by the DataBinder. At this point in the work flow, the Controller consults the method isValidateOnBinding() to determine if it should now run the form bean through the Validators. This method defaults to true, and it is marked final so the only way to change its behavior is through setValidateOnBinding(). If your situation requires a more exact control over when validation is performed after a binding, you may override the suppressValidation() method. While this method defaults to false, this method allows you to choose on a request-by-request basis whether or not to run through the validators. By default, the controller will allow each configured validator to validate the form bean. After all the validators have run, the controller will then call the onBindAndValidate() life cycle method. This callback method is your chance to perform any custom validation logic or general logic after binding and validation.

<resource-ref> <res-ref-name>markwBookDataSource</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> <resource-ref> <res-ref-name>guestBookDataSource</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref>

After onBindAndValidate() runs, the Controller makes a decision based on whether any errors exist These errors would have resulted from the binding process or through automatic validation or custom validation in onBindAndValidate() If there are any errors, the Controller then begins the process of displaying the original form If no errors exist, then the form bean can finally be processed If errors are present and the isSessionForm() method returns true, then the form bean is placed back into the session Remember that the form bean is removed from the session at the beginning of the form submission handling work flow However, when there are errors, the original form is displayed again, and so the form bean is stored in the session again to be bound again once the errors are addressed by the user The referenceData() method is called once more to populate the model with objects for the form.

[ ! "$VAR" ] && VAR="some default"

</session> <!-- =========[ UserSpecificDB Session Bean ]======== --> </enterprise-beans> </ejb-jar>

Finally, the form view is displayed again, with the errors and the form bean If there are no errors, the controller then calls the onSubmit() life cycle method This signals that the form bean is ready to be processed There are several overloaded onSubmit() methods, each method simply calling the other with one fewer method argument This flow, illustrated in Figure 6-2, is arranged this way to allow you to pick the method with the exact number of parameters you will need to process the form There is no need to implement all onSubmit() methods; just choose the one that will work for you There is also a very simple doSubmitAction(), which is the most simple callback method to override and implement If you do not implement any of the onSubmit() methods, you will need to implement this method This method simply provides the form bean to be processed.

Now we simplify the code one final time. If the variable is set, the simpler test evaluates as true, and we want to perform the extra code only in the opposite case. Remember that when we use the logical OR syntax (||), the extra code is run only if the test is false. So we can streamline the code even more by using the simpler test and the OR operation.

In this example, we are including the user s login ID as part of the JNDI name used to look up the data source. The JNDI name is constructed by concatenating the user ID with a base String value. This is only an example implementation for switching data sources; you could easily have an if-else statement or some other switching logic. You will actually create the data sources using the application server console or configuration file, so check your vendor s documentation for more information. However, using the ejb-jar.xml deployment file of your beans, you should add a resource description of the data sources you will want your beans to access. In our recipe, we included two data sources, each with a user ID as part of the JNDI name (the <resource-ref-name/> element) for looking up the resource. Many similar ways to implement a solution such as this one exist, but doing something like this will free you from having to code detailed data-access restrictions. Instead of using the username to build the data source name, you could easily use a role name allowing for a larger group of users to be assigned to a single data source.

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