in RichFaces, While using Email validation i am getting NullPointer Exception?

Question

BeanClass code is:

       public void validEmail(FacesContext context, UIComponent component,
                Object value) throws Exception  
       {

                  //Set the email pattern string
          Pattern p = Pattern.compile(".+@.+\\.[a-z]+");

          //Match the given string with the pattern
          Matcher m = p.matcher(email);

          //check whether match is found 
          boolean matchFound = m.matches();

          if (matchFound)
            System.out.println("Valid Email Id.");
          else
            System.out.println("Invalid Email Id.");
       }

.xhtml Code is:

<h:inputText title="Enter Email Address" value="#{registerBean.email}" id="eMail" required="true" validator="#{registerBean.validEmail}">
<rich:ajaxValidator event="oninputblur"/>

</h:inputText>
<rich:message for="eMail"/>

Exception is:

/Register.xhtml @68,138 validator="#{registerBean.validEmail}": java.lang.NullPointerException

How can i rectify this!

Answer 1

You need to validate the value which is been passed in as method argument, not the local variable email, simply because it isn't been set yet (it has first to be validated!). It will be set only after validation phase, namely the update model values phase.

So, replace

Matcher m = p.matcher(email);

by

Matcher m = p.matcher(value);