Struts2 jQuery Plugins : JSON to load a Dropdown list on clicking a Radio button -

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can suggest how apply json dropdown on clicking radio button. using struts2 jquery plugins , spring framework.

i able retreive data upto action not able populate on jsp

when tried got following error.

  [cachedconnectionmanager] closing connection you.  please close  them yourself:  org.jboss.resource.adapter.jdbc.jdk5.wrappedconnectionjdk5@3f141d  java.lang.throwable: stacktrace

an suggset me correct method? dropdown

<sj:select     listentopics="comment"     href="%{getcategory}"     deferredloading="true"     list="categorylist"     name="details.catagory"     headerkey = "-1"     headervalue="select"     id = "catagory"     cssstyle="width: 200px;"     emptyoption="true"     formids="incident"     onchange="" />


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