How to make custom validator in jsf

Question

hi
i am using jsf for web designing in my projects.now we are using java script for JSF validation .but i am interested to do validation using validator tag of JSF.i have tried ,but it is not working.what can i do for this problem.can u give some simple examples with clear explanations.
My validator class file is
package com.obs.ftw.util.validation;
public class isEmpty implements Validator{
     public isEmpty(){}
     public void validate(FacesContext context, UIComponent uiComponent,Object value) throws ValidatorException{
          System.out.println("Inside the validate");
FacesContext context=new FacesContext();
          String firstName=(String)value;
          if(StringUtils.isEmpty(firstName)){
               FacesMessage message=new FacesMessage();
               message.setSeverity(FacesMessage.SEVERITY_ERROR);
               message.setSummary("First Name is Empty");
               message.setDetail("First Name is Empty");
               context.addMessage("Application:T5",message);
faces-config is
<validator>
          <validator-id>isEmpty</validator-id>
          <validator-class>com.obs.ftw.util.validation.isEmpty</validator-class>     
     </validator>
jsf page is
<h:message for="T5"></h:message>
<h:inputText value=#{mybean.lcFirstname} id="T5" required="true">
<f:validator validatorId="isEmpty"/>
</h:inputText>
this function calls isEmpty constructor.but system.out.println("Hi") isn't called which is defined inside the validate()
fuction.
any problem in this isEmpty function?any one give me a solution with an example
advance thanks
with regards
oasisdeserts

Answer 1

Thanks for reply.i was expecting this one and it is working fine .but i want to validate null or empty string using
validator tag.Is any other way to do this .There is no standard way to do this. You may consider to write your own implementation of the JSF LifeCycle.
can u give some explanation to create messagebundle Check chapter 2.5.2.4 of the JSF specification: [http://jcp.org/aboutJava/communityprocess/final/jsr252/index.html]
whether it will be useful to validate empty string?The default behaviour is:
The 'required' attribute already validates the empty value. If the value is empty and the 'required' attribute is set to true, then the "field is required" message will show up (text may depend on the message settings and configuration -- in JSF 1.2 you can use the 'requiredMessage' attribute to specify that message right in the JSF page). If the value is not empty, then the attached validator will be fired, regardless of the setting of the 'required' attribute. If the value is empty and the 'required' attribute is false or not set, then no validation will be taken place.jsf