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Validation of List property in a Form

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(1) I am having a form that contains a variable called 'listItem', which is in turn , a variable of type 'java.util.List'.
(2) listItem contains objects of type 'UserInfo'. UserInfo contains two attributes name & city (both Strings)
(3) As part of validation, I have the following
<form name="userInfoForm">
<field property="listItem.name" depends="maxlength,mask" >
<msg name="mask" key="userInfoForm.name.display_msg"/>
<arg0 key="userInfoForm.name.display_name"/>
<arg1 name="maxlength" key="${var:maxlength}" resource="false"/>

<field property="listItem.city" depends="maxlength,mask" >
<msg name="mask" key="userInfoForm.city.display_msg"/>
<arg0 key="userInfoForm.city.display_name"/>
<arg1 name="maxlength" key="${var:maxlength}" resource="false"/>

(4) I have the required setup for displaying errors
(5) The form, 'UserInfoForm' extends 'ValidatorForm'
(6) I have the required setup in struts-config.xml

The problem is struts does not validate the fields even if it is wrong/invalid. How do I fix that? Is there anything that I am missing?
Please HELPPP!

Dhan Raj
Don't get me started about those stupid light bulbs.
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