Custom data validation

In addition to providing standard validators for our use, JSF allows us to create custom validators. This can be done in one of two ways—by creating a custom validator class or by adding validation methods to our named beans.

Creating custom validators

In addition to the standard validators, JSF allows us to create custom validators by creating a Java class implementing the javax.faces.validator.Validator interface.

The following class implements an email validator, which we will use to validate the email text input field in our customer data entry screen:

package net.ensode.glassfishbook.jsfcustomval; 
 
import javax.faces.application.FacesMessage; 
import javax.faces.component.UIComponent; ...