You can add a validator to your Web application. A validator defines a set of standard classes for performing common data validation checks, for example, a phone number input field must be numbers. A component can have one or more validators.
To add a validator:
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Select faces-config.xml in the Project Explorer of the J2EE perspective.
The JSF Application Configuration editor opens.
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Select the Component tab of the editor.
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Expand the Validators section.
A list of defined validators displays.
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Click Add.
A new validator is added to the Converters list with the default name New Validatorx.
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(Optional) Change the default validator name to a unique, descriptive name in the Display name field of the General section.
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(Optional) Type a description in the Description field.
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Type an ID in the Validator ID field.
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Click Browse and select a Validator Class.
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Click Add in the Attributes section to add an attribute value.
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Click Add in the Properties section to add a property.
