Struts 2 client side validation not working with xml configuration

All the information is here : http://stackoverflow.com/questions/2647594/trouble-with-client-side-validation-using-struts-2-xml-based-validation-rules-no

I apologize for cross posting but this is really critical and I don't know what I am doing wrong. I looked at this and can not figure out where I am going wrong.
Thanks,

Kartik

Maybe post it here too, otherwise anything here will be completely out of context.

As I mentioned earlier, I am unable to validate my form inputs. When I don't select any option from the pull down menu (The default value is ""), even then the action method is executed and result page displayed. I want it to show the configured error message from the xml file. I am not sure what I am doing wrong. Any help would be appreciated.

My form jsp is given below

My validators in WEB-INF/classes are given below:

<!DOCTYPE validators PUBLIC
    "-//OpenSymphony Group//XWork Validator Config 1.0//EN"
    "http://www.opensymphony.com/xwork/xwork-validator-config-1.0.dtd">
 <validators>
<validator name="required"   
        class="com.opensymphony.xwork2.validator.validators.RequiredFieldValidator"/>
<validator name="requiredstring" 
        class="com.opensymphony.xwork2.validator.validators.RequiredStringValidator"/>
<validator name="int" 
        class="com.opensymphony.xwork2.validator.validators.IntRangeFieldValidator"/>
<validator name="long" 
        class="com.opensymphony.xwork2.validator.validators.LongRangeFieldValidator"/>
<validator name="short" 
        class="com.opensymphony.xwork2.validator.validators.ShortRangeFieldValidator"/>
<validator name="double" 
       class="com.opensymphony.xwork2.validator.validators.DoubleRangeFieldValidator"/>
<validator name="date"  
       class="com.opensymphony.xwork2.validator.validators.DateRangeFieldValidator"/>
<validator name="expression" 
       class="com.opensymphony.xwork2.validator.validators.ExpressionValidator"/>
<validator name="fieldexpression" 
       class="com.opensymphony.xwork2.validator.validators.FieldExpressionValidator"/>
<validator name="email" 
       class="com.opensymphony.xwork2.validator.validators.EmailValidator"/>
<validator name="url"            
       class="com.opensymphony.xwork2.validator.validators.URLValidator"/>
<validator name="visitor"           
       class="com.opensymphony.xwork2.validator.validators.VisitorFieldValidator"/>
<validator name="conversion" 
   class="com.opensymphony.xwork2.validator.validators.ConversionErrorFieldValidator"/>
<validator name="stringlength" 
      class="com.opensymphony.xwork2.validator.validators.StringLengthFieldValidator"/>
<validator name="regex"  
      class="com.opensymphony.xwork2.validator.validators.RegexFieldValidator"/>
<validator name="conditionalvisitor" 
class="com.opensymphony.xwork2.validator.validators.ConditionalVisitorFieldValidator"/>
</validators>

My action specific validation rule (ActionItemTrackingAction-findByCriteria-validation.xml) is in WEB-INF/classes.

My struts mapping

My action-class is given below: