Multiple choice technology web technology

A validator in JSF is only designed to validate one component, so in general just one field, and validating multiple fields is tricky.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

JSF validators are designed to validate individual component values, not multiple fields simultaneously. Cross-field validation requires workarounds like using phase listeners, custom validators that access other components via UIComponent.findComponent(), or Bean Validation (JSR 303/380) annotations with class-level constraints.

AI explanation

Standard JSF validators (e.g., LengthValidator, RangeValidator, or a custom Validator implementing javax.faces.validator.Validator) are attached to and operate on a single UIComponent/EditableValueHolder at a time — the validate() method receives one component and one value. Cross-field validation (checking relationships between multiple fields, like "confirm password matches password") is indeed awkward with the standard validator model and typically requires workarounds like a PhaseListener, a custom composite component, or JSF's newer Bean Validation-based cross-field techniques. So the statement is True as written.

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