Struts2 -- NullPointerException from radio button -

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i have following form in struts2 jsp contains radio buttons. there 2 other forms on page work correctly, 1 doesn't. have determined value selected somehow not being passed, , that reason i'm getting nullpointerexception, can't figure out why it's happening. can me? here jsp form.

            <s:form action="processpoll3">                 <table>                     <tr>                         <td><b><i>poll #3</i></b></td>                         <td>how many kids have?</td>                         <td><s:radio name="poll3"                             list="#{'1':'0.', '2':'1.', '3':'2.',                                      '4':'3.', '5':'more 3.'}" />                         <s:submit value="vote poll #3" align="left" /></td>                     </tr>                 </table>             </s:form>

my dao class gets called line (and being called, sure): string poll3; private httpservletresponse response;

public string getpoll3() {     return poll3; }  public void setpoll2(string poll3) {     this.poll3 = poll3; }  public string execute() {         poll3dao poll3dao = new poll3dao();          if (poll3dao.tallyvote(poll3).equals("success")) {            // processing goes on here, not relevant problem         }

here method in dao class, breakdown point marked because parameter supposed passed null.

public string tallyvote(string vote) {     string successfulwrite;     request = servletactioncontext.getrequest();     sessionfactory sessionfactory = (sessionfactory) request.getsession()             .getservletcontext().getattribute("sessionfactory");     session session = sessionfactory.opensession();     try {         // previous results         transaction tx1 = session.begintransaction();         query myquery = session.createquery("from poll3");         tx1.commit();          // update results         iterator<poll3> iterate = myquery.iterate();         poll3 poll3 = iterate.next();         // nullpointerexception occurs on next line         if (vote.equals("1")) {             poll3.setzero(poll3.getzero() + 1);         } else if (vote.equals("2")) {             poll3.setone(poll3.getone() + 1);         } else if (vote.equals("3")) {             poll3.settwo(poll3.gettwo() + 1);         } else if (vote.equals("4")) {             poll3.setthree(poll3.getthree() + 1);         } else if (vote.equals("5")) {             poll3.setmorethanthree(poll3.getmorethanthree() + 1);         }          // write new results database;         transaction tx2 = session.begintransaction();         session.update(poll3);         tx2.commit();         successfulwrite = "success";     } catch (exception e) {         system.out.println(e.tostring());         successfulwrite = "failure";     }      return successfulwrite; }

i'm betting it's this:

public void setpoll2(string poll3) { ... }

this why have map/collection support avoid writing cut-and-paste blobs this.

any time find cutting , pasting code in snippets it's because abstraction has been ignored/overlooked.


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