Error:Type mismatch: cannot convert from Long to Long

hi friends,
I've a problem.I've a JSP that does some long converions,and its working fine when i make it run on my machine i.e
(Running Tomcat5.0),but when I deploy this file on the server which runs Tomcat 5.5.7,it throws this error:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 20 in the jsp file: /abc.jsp
Generated servlet error:
Type mismatch: cannot convert from Long to Long
Can anyone of you,tell me where i am going wrong???

Here is an example of doing it with a JavaBean... the bean looks like this:
package net.thelukes.steven;
import java.io.Serializable;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class FormHandlerBean implements Serializable {
     private static final long serialVersionUID = 1L;
     private Date startTime = null;
     private DateFormat dateFormatter;
     public FormHandlerBean() {
          setDateFormat("yyyy-MM-dd hh:mm:ss");
     public void setStart(String strt) {
          setStartAsString(strt);
     private void setStartAsString(String strt) {
          setStartAsDate(getDate(strt));
     private void setStartAsDate(Date d) {
          startTime = d;
     private Date getDate(String s) {
          Date d = null;
               try {
                    d = dateFormatter.parse(s);
               } catch (ParseException pe) {
                    System.err.print("Error Parsing Date for "+s);
                    System.err.println(". Using default date (right now)");
                    pe.printStackTrace(System.err);
                    d = new Date();
          return d;
     public long getStartAsLong() {
          return getStart().getTime();
     public String getStartAsString() {
          return Long.toString(getStartAsLong());
     public Date getStart() {
          return startTime;
     public void setDateFormat(String format) {
          dateFormatter = new SimpleDateFormat(format);
}You would only need to make the getStartXXX methods public that need to be accessed from the JSP. For example, if you will not need to get the Long value of the time, then you do not need to make getStartAsLong public...
The JSP looks like this:
<html>
<head>
    <title>I got the Form</title>
</head>
<body>
    <h3>The Output</h3>
    <jsp:useBean class="net.thelukes.steven.FormHandlerBean" id="formHandler"/>
    <%
         formHandler.setStart(request.getParameter("start"));
    %>
    <table>
      <tr><td>Start as String</td><td><jsp:getProperty name="formHandler" property="startAsString"/></td></tr>
      <tr><td>Start as Date</td><td><jsp:getProperty name="formHandler" property="start"/></td></tr>
      <tr><td>Start as long</td><td><jsp:getProperty name="formHandler" property="startAsLong"/></td></tr>
    </table>
</body>
</html>If this were a servlet processing the form rather than a JSP, I might throw the ParseException that might occur in getDate and catch it in the Servlet, with which I could then forward back to the form telling the user they entered mis-formatted text value... But since JSPs should be mainly display, I catch the exception internally in the Bean and assign a safe value...

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