Java EE (Java Enterprise Edition) General Discussion

Here i want to get the value from List box from Jsp to Servlet.

Here actually am using Two Listbox, using Javascript i have done moving Listbox Values to one Listbox to another Listbox,but in Jsp when i click button for the Servlet page to get the value of Listbox values it gives me an NullpointerException.if i select any values mean its show in Servlet.

this is the coding which i have created in jsp page for this process.

<form name="f1" action="insert" method="POST" >


       <select name="reg" size="4" multiple="multiple">
           <option value="1">1</option>
           <option value="2">2</option>
           <option value="3">3</option>
           <option value="4">4</option>
       </select>     
               <select name="reg1" size="4" multiple="multiple">
           
       </select>      
       <input type="submit" value="Go!" name="b1" />

              </form>

here i use to move the items from first listbox to second listbox ...that process has done using javascript.now i want to move the second listbox values to Servlet[here i should not select the second listbox values]

this is my problem..please give me a suggestion regarding..