Getting null while trying to get value of Multiple list

Hi All,

I am facing strange problem, I have JSP and servlet. The values in jsp are coming from DB. there are two multiple list boxes where i will move the data across, when i am trying to get the values of the list box i am getting null. when i retrieve first list box i am getting the values, when i am trying to get the values of list box 2 then i am getting null. Can anyone please help.

List box names subServiceList1 and subServiceList2

JSP:

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page language="java"%>
<%@page import="java.util.ArrayList,java.util.HashMap,au.com.anl.beans.AllocationServiceBean"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link href="css/alloc.css" rel="stylesheet" rev="stylesheet" type="text/css"/>
<link rel="stylesheet" type="text/css" href="css/balloontip.css" />
    <title>Vessel / Voyage Allocation Application</title>
	<link href="css/alloc.css" rel="stylesheet" rev="stylesheet" type="text/css"/>
  <script type="text/javascript" src="javascript/ListMove.js"></script>
  </head>
  <body>
  <div id="heading" style="position: absolute; top: 20px; left: 0px; z-index: 1; display:block; width:100%">
	<table >
		<tr>
			<td  nowrap><span class="heading">Vessel / Voyage Allocation</span></td>
		</tr>
	</table>
  </div>
  <div id="body" style="position: absolute; top: 0px; left: 0px; width:100%" >
	  	<table border="0"     class="tableimage">
			<tr>
				<td><img  /></td>
				<td> </td>
				<td ><img  /></td>
			</tr>
		</table>
		<center><br/>
      <span class="colorHeading">Manage Sub Service</span>
      <%
        String serviceCode = (String)session.getAttribute("serviceCode");
        ArrayList serviceList = (ArrayList)session.getAttribute("serviceList");
        HashMap serviceMap = (HashMap)session.getAttribute("serviceMap");
        ArrayList selServiceList = (ArrayList)serviceMap.get("serviceList");
        ArrayList selSubServiceList = (ArrayList)serviceMap.get("subServiceList");
      %>
			<form action="SubServiceAllocationServlet" method="post" name="managesubservice">
			  <br />
			  <br />			  
				<fieldset class="myFieldSetNoBorder" style="width:780px">
				    <table border="0"     class="tableimage">
					    <tr>
					    	<td  nowrap >
					    		<span class="textHeading">Service Code : </span>
                  <select name="serviceCode" class="textSelect">
                  <%
                    String selected = "";
                    if (serviceList != null)
                    {
                      for (int count = 0; count < serviceList.size(); count ++)
                      {
                        AllocationServiceBean serviceBean = (AllocationServiceBean)serviceList.get(count);
                        if (serviceBean.getServiceCode().equalsIgnoreCase(serviceCode))
                          selected="selected";
                        else
                          selected="";
                  %>
                    <option value="<%= serviceBean.getServiceCode() %>" class="textSelect" ><%= selected%>><%= serviceBean.getServiceCode()%></option>
                  <% 
                      }
                    } 
                  %>		
                  </select>  
						  		<input name="SubServiceAllocationPageBtns" type="submit" value="List" class="btn" onmouseover="this.className='btn btnhov'" onmouseout="this.className='btn'"/>				  		
						  	</td>	
					  	</tr>					  	
				  	</table>
				  </fieldset>	
				  <br/>				  	 
				  <br />
			  	  <br />
				  <fieldset class="myFieldSetNoBorder" style="width:780px">
				  	<table border="0"    >
					  	<tr>
					  		<td  nowrap >
						  		<select name="subServiceList1" size="12" id="subServiceList1" class="textSelect" multiple="multiple" style="width: 200px">
                  <%
                    if (selServiceList != null)
                    {
                      for (int s1count = 0; s1count < selServiceList.size(); s1count ++)
                      {
                  %>
                    <option value="<%= selServiceList.get(s1count) %>"><%= selServiceList.get(s1count)%></option>
                  <% 
                      }
                    } 
                  %>	
						    	</select>
						    </td>
						    <td  >
						    	<table border="0"     class="tableimage">
						    		<tr>
						    			<td>
                        <input type="button" value=" Insert " class="btn" onClick="move(subServiceList1,subServiceList2);"/>
						    			</td>	
						    		</tr>
						    		<tr>
						    			<td>
                         
						    			</td>	
						    		</tr>
						    		<tr>
						    			<td>
                        <input type="button" value="Remove" class="btn" onClick="move(subServiceList2,subServiceList1);"/>
						    			</td>	
						    		</tr>
						    	</table>
						    </td>
				  		<td  nowrap >
						  		<select name="subServiceList2" size="12" id="subServiceList2" class="textSelect" multiple="multiple" style="width: 200px">
                  <%
                    if (selSubServiceList != null)
                    {
                      for (int s2count = 0; s2count < selSubServiceList.size(); s2count ++)
                      {
                  %>
                    <option value="<%= selSubServiceList.get(s2count) %>"><%= selSubServiceList.get(s2count)%></option>
                  <% 
                      }
                    } 
                  %>						        
						    	</select>
						    </td>
					  	</tr>
				  	</table>
				  </fieldset>
				  <br />
				  <br />
				  <br />		  	  			   	  			  
  				  <fieldset class="myFieldSetNoBorder" style="width:780px">
							<input name="SubServiceAllocationPageBtns" type="submit" value="Submit" class="btn" onmouseover="this.className='btn btnhov'" onmouseout="this.className='btn'"/>
				   </fieldset>
  				  <br />
  			</form>
  	  </center>
    </div> 	       
  </body>
</html>

Serlvet Code:

It's pretty difficult to comprehend that code.

Have you verified they're being sent (like by using Firebug or a debugging proxy etc.)?

Thanks for the response David, I verified will firebug it doesn't seem any problem. I am getting all the values from the form except the second list subServiceList2 .

The following is the output.

selectedSubList : null
ParameterNames : SubServiceAllocationPageBtns
ParameterNames : subServiceList1
ParameterNames : serviceCode