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Cascading DropDown

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Hi Im back with some other query....

While im working with cascading dropdown,here is my script

function show_details() {

here is my dropdown after selecting some value from this dropdown im taking this value to action class JobAction.....

<s:select label="Business or Business Id" name="business" headerKey="Select" headerValue="Select" list="ListOfClients" listKey="%{business}" listValue="%{business}" required="true" style="border:1px solid #ccc; background:#fff; width:165px;" onchange="javascript:show_details();return false;"/>
<s:url id="d_url" action="JobAction" /> <sx:div id="details" href="%{d_url}" listenTopics="show_detail" formId="frm" showLoadingText=""></sx:div>

but im unable to return back to the same jsp with some list for second dropdown......
its throwing error like
Before selecting value from dropdown:

Error loading '/JATS/JobAction.action' (500 Internal Server Error)

after selecting value from first dropdown its going to action class with the selected value from dropdown....
but here in this action class im unable to return to the same jsp with some list
its throwing error like:

Couldn't load content:Unknown runtime error

in standard error log its throwing error like:
ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@a75737')

could you please help me out in finding solution for this
thanks in advance

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