AJAX validation not working with struts2 Jquery plugin - jquery-plugins

I am writing a web application with struts2 + Jquery plugin.
I am using AJAX form submission with sj:submit tag from jquery plugin.
I am facing an issue while validating the form (AJAX) with "validate= true" tag in sj:submit.
Following is the sj:submit tag:
<sj:submit value="ADDUSERNOW" onBeforeTopics="before" onSuccessTopics="success"
onErrorTopics="errorState" onCompleteTopics="complete" targets="userMgmntDiv" validate="true"/>
My html head section also contains references to two js files required for validation as below.
<script language="JavaScript" src="${pageContext.request.contextPath}/struts/utils.js" type="text/javascript"></script>
<script language="JavaScript" src="${pageContext.request.contextPath}/struts/xhtml/validation.js" type="text/javascript"></script>
Validation xml is given below which is named as ActionClass-validation.xml and is placed in the same package as that of a class on which validation is invoked:
<validators>
<field name="userModel.userName">
<field-validator type="requiredstring">
<message>UserName Is Required</message>
</field-validator>
</field>
</validators>
After form is submitted , no validation is triggered , and execution proceeds and struts2 action class is called.
Is there anything I am missing here ? I have searched a lot but couldn't find any answer .Please help
struts2-core version : 2.3.4
struts2-jquery-plugin :3.3.3
Action configuration looks loke below :
<action class="addUserAction" method="addUser">
<interceptor-ref name="jsonValidationWorkflowStack"/>
<result>addUser.jsp</result>
</action>
In addition to above,I am using spring + struts2 + hibernate for achieving above task.When I tried the example as shown in struts2-jason wiki page : ,I am getting error as : cannot find action with class named AddUserAction(which is a bean in spring-beans.xml)
It seems that error is thrown when validator inteceptor is invoked.
When I comment out the annotations used for validation on the action class - AddUserAction, this error vanishes and page loads successfully.
Following are my questions :
1)How can I use spring alongwith struts2 convention plugin ? This is because , convention plugin uses its own mechanism for mapping urls and action (using annotations or default behaviour).
2)Previuosly , I was expecting struts.xml file can be used for url to action mapping , and annotations can be used for validations. (using convention plugin)But this approach doesn't seem to work.(convention plugin + struts.xml doesn't work)

struts2 ajax validation is a client side validation, which provided natively by dojo, here is the doc for Struts2 Ajax validation. struts2-jquery plugin provides this feature using jsonValidationWorkflowStack, you can use it like this: Example

I've tried. It's work very well. But if your form has an input file for upload, the ajax validation don't work.

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