Java EE 8 Application Development

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; 
import javax.faces.component.html.HtmlInputText; 
import javax.faces.context.FacesContext; 
import javax.faces.validator.FacesValidator; 
import javax.faces.validator.Validator; 
import javax.faces.validator.ValidatorException; 
import org.apache.commons.lang3.StringUtils; 
 
@FacesValidator(value ...