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PART I PART I PART I
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Observing the Request Processing Lifecycle in Action
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Now that you have seen the theory behind each request processing lifecycle phase, it s time to see the lifecycle in action Recall the JSF Registration (JSFReg) application shown in 2 and again here in Figure 3-9 We will step through the lifecycle phases as a user interacts with the application and submits the registration form (registerjsp) 1 Initial Request to View the registerjsp Page In order to view the registration form page in the first place, a user submits a request to the URL of the register page, which triggers a run through the request processing lifecycle in an abbreviated fashion The request is processed first by the Faces Controller servlet, which creates a FacesContext instance for this request and initiates a call to the lifecycle Since this is an initial request (also referred to as a non-postback request) to view the registration page, the Restore View phase creates an empty View (UIViewRoot) component tree and stores it in the FacesContext instance
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FIGURE 3-9 registerjsp: the registration page of the JSFReg application
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Part I:
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The JavaServer Faces Framework
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After the View is created, the lifecycle immediately proceeds directly to the Render Response phase since there was no incoming field data in the request to validate or process (also referred to as a non-postback request) It is during this phase when the empty View component tree is populated with the components that are referenced in the source of the registration page and represent the input fields and submit button Once the tree is populated, the components then render themselves to the client At the same time, the state of the View component tree is saved for future requests The user now sees the registration page rendered in a browser 2 User Enters Invalid Data in the Registration Page Let s say the user forgets to enter his last name and also enters the wrong format for the date, and then clicks Register (as illustrated in Figure 3-10) As the JSF runtime receives the request, it enters the initial Restore/Create View phase and this time it restores the earlier View component tree that was saved after the user s previous request This is commonly referred to as a postback because the HTTP method for this request is POST since it is posting new form data The Apply Request Values phase is then entered and the components are updated with the incoming values from the request even though they may not be fully valid yet No errors occur here because each UI component simply stores the submitted values as String values of the request parameter, not the actual converted (server-side data type) or validated value The UI component stores this in a special pre-converted/ validated submittedValue JavaBean property, which literally stores the String value of a request parameter
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FIGURE 3-10 Entering invalid data in the registration page
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The JavaServer Faces Request Processing Lifecycle
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As the Apply Request Values phase completes, the Process Validations phase is initiated At this point a conversion error occurs when the incoming date value cannot be converted to a javautilDate data type, which corresponds to the managed bean UserBean s dob property, because of its invalid format A message is queued, the component is marked invalid, and the processing continues The remaining valid field values are applied to their respective UI components As each UI component has its validate method called, the component that is supposed to be holding the lastName value encounters a validation error because no value was supplied in the postback request Recall that we set the required attribute of the Last Name input field to true As a result of the validation error, the lifecycle sets the state of the lname (last name) UIInput component to invalid and queues the appropriate Faces message indicating that the field requires a value At this point the Process Validations phase is complete Because there were validation and conversion errors, the lifecycle jumps directly to the Render Response phase, which then renders the same registration page (registerjsp) with the appropriate error messages next to the last name field and the date field Recall that individual Message components were assigned to each input field component by assigning their IDs, as shown here:
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