JSF for Nonbelievers: The JSF Application Lifecycle
By Rick Hightower2005-05-05
Phase 3: Process Validation
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The first event handling of the lifecycle takes place after the apply request values phase. At this stage, each component will have its values validated against the application's validation rules. The validation rules can be pre-defined (shipped with JSF) or defined by the developer. Values entered by the user are compared to the validation rules. If an entered value is invalid, an error message is added to FacesContext, and the component is marked invalid. If a component is marked invalid, JSF advances to the render response phase, which will display the current view with the validation error messages. If there are no validation errors, JSF advances to the update model values phase.
Tutorial Pages:
» Walk Through the 6 Phases of JSF's Request Processing Lifecycle
» The JSF Lifecycle: an Overview
» Phase 1: Restore View
» Phase 2: Apply Request Values
» Phase 3: Process Validation
» Phase 4: Update Model Values
» Phase 5: Invoke application
» Phase 6: Render Response
» A Working Example
» Let's Code it
» Use Case 1: Add a New CD
» Use Case 2: Edit a CD
» Use Case 3: Sort CDs
» Immediate Event Handling
» Conclusion
» Resources
First published by IBM DeveloperWorks
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