The Java EE 6 Tutorial, Volume I

Validating a Component’s Value

To validate a component’s value using a particular validator, you need to register that validator on the component. You can do this in one of the following ways:

See Referencing a Method That Performs Validation for more information on using the validator attribute.

The validatorId attribute works similarly to the converterId attribute of the converter tag, as described in Converting a Component’s Value.

Keep in mind that validation can be performed only on components that implement EditableValueHolder because these components accept values that can be validated.