tomcat crashes when counting lines in a text file

Here is my JSP page....

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>MNVap Website Administration</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link href="styles.css" rel="stylesheet" type="text/css">
</head>
<body bgcolor="#FFFFFF" leftmargin="0" topMargin="10" border="0" marginheight="0" marginwidth="0">
<div align="center">
<table width="760" border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="3"><img src="images/title.gif" border="0"></td></tr>
<tr><td bgcolor="#666600" height="5"></td><td bgcolor="#CCCC66" height="5"></td><td bgcolor="#999900" height="5"></td></tr>
</table>
<table width="760" border="0" cellpadding="0" cellspacing="0">
<tr><td><br></td></tr>
<tr><td width="760" height="25" align="left" valign="middle" bgcolor="#008000" id="title">Update Shareholders Database</td></tr>
<tr><td><br></td></tr>
<form method="get" action="index.jsp">
<tr><td>Enter the File Name:<input type="text" name="whatfile" /> <input type="submit" value="Go" /></td></tr>
</form>
</table>
<%@ page import="admin.*" %>
<%@ page buffer="8000kb" %>
<% 
Shareholders sh = new Shareholders(request.getParameter("whatfile"));
if (sh.huh() != null) {
out.print(sh.totalLines());
}
%>
<% out.print(sh.huh()); %>
<br>
</div>
</body>
</html>

Here is my public class....

The Problem...
From my JSP page I call the 'public int totalLines()' method in my public class. That method works fine running in a standalone app. but when I attempt to execute it on Tomcat it crashes.
The JSP file takes the filename as a string input. Then it looks for that filename and when it goes into count the total lines in that file it crashes. In fact if I enter in any random string, once it hits that totalLines() method it crashes. I am not validating the string at this point and wont need to when this is complete. But WHY is it crashing when I call that method???
Is Tomcat not finding the file? Where does this text file need to go in relation to my class and JSP files?
Please help...
thanks

You accidently left a System.exit() in the code - calling System.exit prevents Tomcat from processing whatever error/exception message you should be seeing. Probably an IOException because you are using the File method that depends on the "current" directory. In Servlets you can't depend on the "current" directory being any particular thing - therefore, pass a complete path to the FileReader constructor.
Bill