Does not print the error message at my behest???

I have a program which works but I want to give appropriate error handling to the user of application.
So basically a simple html page asks for servername, username and password and this is passed onto this .jsp page.
When the correct servername, username and password is entered program is okay but when for example incorrect servername is given it does not print the error message at my behest???????
Here is a ftp page:

<html>
<head>
<title> FTP Login </title>
</head>
<body>
<%@ page import= "ftp.* " %>
<jsp:useBean class="ftp.FtpBean" id="ftpbean" scope="session" />
<%      try
           String servername = request.getParameter("servername");
           String username   = request.getParameter("username");
           String password   = request.getParameter("password");
           ftpbean.ftpConnect(servername, username, password);
        catch(Exception e)
           out.println("There has been an error with logging into system");
           out.println("please check Servername");
           out.println("Please check username");
           out.println("Please check password");
%>
<h1> You have successfully logged in. </h1>
</body>
</html>Why does it print:
Error: 500
Location: /myJSPs/jsp/grid-portal-project/processftplogin.jsp
Internal Servlet Error:
javax.servlet.ServletException
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:460)
     at jsp.grid_0002dportal_0002dproject.processftplogin_2._jspService(processftplogin_2.java:120)
instead of:
There has been an error with logging into system
Please check Servername
Please check username
Please check password

man do one thing
first tell me the book u are using for JSP.
cos even i would like to purchase.
u mailed me before
but this time make a good description
of your project write it in a file
then zip it along with your project
source(if possible)...
then in that project report
also give the description of using the JSP tomcat
and all (cos i dont know for windows...or linux)
this will be all...

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