Internal Server Error (HTTP 500)

I try to run a JSP but after publishing it to a Tomcat 5.5 localhost server, the error is Internal Error. I find no defect in the code. The code is given below :
<%@page errorPage="errorPageJSP.jsp" %>
<%@page import="teller.Teller"%>
<%@page import="exception.InvalidCustomerException"%>
<%@page import="java.sql.SQLException"%>
<%@page import="exception.WrongUserException"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<link rel="stylesheet" type="text/css" href="default.css"/>
<title>Add Account</title>
</head>
<body>
<%
     String sUser=(String)session.getAttribute("return");
     int user=Integer.parseInt(sUser);
     if ((2 == user) || (3 == user)) {
               int customer_id = Integer.parseInt(request
               .getParameter("custID"));
               String customer_acctype = request.getParameter("acctype");
               double initial_deposit = Double.parseDouble(request
               .getParameter("initialDepo"));
%>
<jsp:useBean id="accountBean" class="bean.Account">
     <%-- intialize bean properties --%>
     <jsp:setProperty name="accountBean" property="customerID"
          value="<%=customer_id%>" />
     <jsp:setProperty name="accountBean" property="accountType"
          value="<%=customer_acctype%>" />
     <jsp:setProperty name="accountBean" property="balanceAmount"
          value="<%=initial_deposit%>" />
</jsp:useBean>
<%
               Teller accountDB = new Teller();
               int iLoop = accountDB.addAccount(accountBean);
               System.out.println(iLoop);
%>
<h2>Account Started Successfully</h2>
<%
     }else {
          throw new WrongUserException();
%>
</body>
</html>Edited by: NarayananKrish on May 18, 2008 10:44 PM

I do not know a single person who can write defect free code.
What if sUser is null or custID is null or acctype is null or initialDepo is null? I don't see any null checks around it.
Try catching the exception in your JSP. I am sure there is a defect in it.

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