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JSF Basics: Guess Number Application Lifecycle

This sample JSF application lets users guess a number using JSF 1.0 as part of J2EE 1.4 SDK. Learn about JSF page lifecycle, input validation, and request processing phases. Initial requests and postbacks are handled differently in JSF.

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JSF Basics: Guess Number Application Lifecycle

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  1. JavaServer Faces: Sample App + Life Cycle Compiled from Sun TechDays workshops (JSF Basics, Web-Tier Codecamp: JavaServer Faces, Java Studio Creator)

  2. Sample JSF Application • guessNumber application that comes with JSF 1.0 as part of J2EE 1.4 SDK • Guess a number between 0 and 10, inclusive • The response page tells you if you guessed correctly • • Input validation

  3. Starting Page

  4. Failure Outcome Navigation

  5. Success Outcome Navigation

  6. Input Validation Error

  7. Lifecycle of JSF Page • A JSF page is represented by a tree of UI components, called a view • When a client makes a request for the page, the lifecycle starts • During the lifecycle, JSF implementation must build the view while considering state saved from the previous postback • When the client performs a postback of the page, JSF implementation must perform lifecycle steps • validation • conversion

  8. Request Processing LifecyclePhases • 1. Reconstitute component tree phase • 2. Apply request values phase • 3. Process validations phase • 4. Update model values phase • 5. Invoke application phase • 6. Render response phase

  9. Request Processing Lifecycle

  10. Request Processing Lifecycle Source: http://www.ibm.com/developerworks/library/j-jsf2/

  11. Request Processing • Life-cycle handles two types of requests • Initial request & Postback • Initial request • A user requests the page for the first time • Lifecycle only executes the Restore View and Render Response phases • Postback • A user submits the form contained on a page that was previously loaded into the browser as a result of executing an initial request • Lifecycle executes all phases

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