How to insert a bean variable into MySql using jsp

Hi, I have a problem that I have been trying to work out for ages..unsuccessfully.
My web-site takes 2 inputs off a user...does a calculation on them and returns the result to the user.
I want to then use another jsp page that will take this result and insert it into a database...
My class code for this is :
public void updateRepmax(String userName, String repmax) throws SQLException, Exception{
     if(con != null){
     try{
     PreparedStatement update;
     update = con.prepareStatement("UPDATE repmax SET Benchpress = ?, WHERE Member_Name = ?");
     update.setString(1, repmax);
     update.setString(2, userName);
     update.execute();
     } catch(SQLException sqle){
     error = "SQLException: could not update repmax";
     throw new SQLException(error);
     catch(Exception e){
     error = "An exception occured while updating repmax";
     throw new Exception(error);
     } else {
     error = "Exception: connection to database was lost";
     throw new Exception(error);
My JSP is :
<%@page import="java.sql.*, placement.*"%>
<jsp:useBean id="conn" class="placement.DBConnect" />
<jsp:useBean id="query" class="placement.DBQuery" />
<jsp:useBean id="bpcalc" class="placement.repmaxBean" />
<jsp:useBean id="userin" class="placement.User" />
<html>
<head><title>Update Repmax</title></head>
<body>
<%
conn.connect();
     String repmax = bpcalc.getRepmax();
     String userName = userin.getUserName();
query.setCon(conn.getCon());
     query.updateRepmax();
conn.disconnect();
%>
     </body>
     </html>
The variable I am tryin to insert is repmax ,in the class that does the calculation the repmax is a double so I assume that is my first problem(how can this be changed to allow it to insert?)....any help you have to offer would be greatly appreciated... 

Thanks for your reply sathishkb,
I am not actually receiving any error message,
The jsp page is processed and the code seems to be correct however the table in my mysql database is not updated.. my JDBC drivers are working correctly etc.
I expect that the problem is in my JSP page but dont know what it is
I have removed that comma in my update statement
I no longer have the problem of the variable being of type touble as I altered my other code to convert the variable from double to string
jsp is now:
<%@page contentType="text/html"%>
<%@page import="java.sql.*, placement.*"%>
<jsp:useBean id="conn" class="placement.DBConnect" />
<jsp:useBean id="update" class="placement.DBQuery" />
<jsp:useBean id="bpcalc" class="placement.repmaxBean" />
<jsp:useBean id="currentuser" class="placement.currentuserBean" />
<html>
<head><title>Insert Into Repmax</title></head>
<body>
<%
String repmax = bpcalc.repmax;
String userName =currentuser.name;
conn.connect();
     update.setCon(conn.getCon());
     update.updateRepmax(repmax,Username);
conn.disconnect();
%>
     </body>
     </html>
the segment of my bean code is :
public void updateRepmax(String repmax,String userName) throws SQLException, Exception{
     if(con != null){
     try{
     PreparedStatement update;
     update = con.prepareStatement("UPDATE repmax set Benchpress = ? WHERE Member_Name= ?");
     update.setString(1,repmax);
     update.setString(2,userName);
     update.execute();
     } catch(SQLException sqle){
     error = "SQLException: could not update employer";
     throw new SQLException(error);
     catch(Exception e){
     error = "An exception occured while updating employer";
     throw new Exception(error);
     } else {
     error = "Exception: connection to database was lost";
     throw new Exception(error);
}

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