struts2 jquery grid multiple drop downs not working it hangs entire application and jboss server

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Struts2 jquery grid column multiple drop downs not loading data in single jsp page  from action class. My requirement is when i want to add record to the grid in add record popup I need to show multiple drop downs for different grid columns. But not working it hangs entire application and jboss server. and same problem occured in s form for sj: select boxes .

Jboss Server version 6.4.3

Jsp Page Grid:

          <s:url id="projectmanagerurl" action="project-manager-action"></s:url>

         <s:url id="purposecategoryurl" action="purpose-category-action" ></s:url>

          <sjg:gridColumn name="projectManager" index="projectManager" title="Project Manager" editable="true"  surl="%{projectmanagerurl}" editoptions="{dataUrl : '%{projectmanagerurl}'}"  

     edittype="select" /> 

   

     <sjg:gridColumn name="purposeCategory" index="purposeCategory" title="Purpose Category"  surl="%{purposecategoryurl}"  editable="true" edittype="select" 

             editoptions="{dataUrl : '%{purposecategoryurl}',maxlength:20 }" />