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Introduction

Often the data used to populate a form control is dynamically generated, perhaps from a database. When the user submits the form, the Struts 2 validation interceptor attempts to validate the user's form input. If validation fails the Struts 2 framework returns the value "input" but the "input" action is not re-executed. Rather the view associated with the "input" result is rendered to the user. Usually this view is the page that displayed the original form.

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If you examine class EditAction in the example application (see above) you'll see that it implements the Preparable Interface. In the prepare method is this code:

		
   carModelsAvailable = carModelsService.getCarModels() ;
		
   setPersonBean( editService.getPerson() );

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