JSP newbie. Strange classnotfoundexception

I have recently started writing JSPs. I am an experienced Java programmer, but have not ventured into JSPs until just now.
While writing some test JSPs, I have run into a big problem that I cannot seem to resolve.
While attempting to run my JSP from IE, tomcat throws the following exception in the console window: java.lang.ClassNotFoundException: RTSite
Also, unless I change the SITES_FN to "C:\\sites.dat" and place the sites.dat file in C:\, it tells me it cannot find the file. For example, if I change SITES_FN to simply "sites.dat" and place sites.dat in the C:\tomcat_5.5\webapps\ROOT directory alongside my outages.jsp file, it tells me it can't find it!
How on earth do I fix this? What am I doing wrong?
Here is my JSP:
===================================
<%@page import="java.util.*,java.io.*,test.RTSite"%>
<HTML>
<BODY>
<%!
     String SITES_FN = "C:\\sites.dat";
     String OUTAGES_FN = "outages.dat";
     String OUTAGES_TXT_FN = "outages.txt";
     boolean eof = false;
     RTSite site;
     //site = new RTSite("http://www.georgianavigator.com/perl/trips", "ATL", "Atlanta", "GA");
%>
<%
     site = new RTSite("http://www.georgianavigator.com/perl/trips", "ATL", "Atlanta", "GA");
     out.println(site.getName());
     try
          FileInputStream in = new FileInputStream(SITES_FN);
          ObjectInputStream s = new ObjectInputStream(in);
          while (!eof)
               try
                    site = (RTSite)s.readObject();
                    out.println("TEST" + site.getCode());
               catch (EOFException ex)
                    eof = true;
          //s.close();
          //in.close();
     catch (Exception ex)
          out.println(ex.getMessage());
          System.out.println("=====");
          ex.printStackTrace();
%>
</BODY>
</HTML>
===========================================
Here is my directory structure:
C:\tomcat_5.5
+-----webapps
-------+----ROOT
-------------+----outages.jsp
-------------+----sites.dat
-------------+----WEB-INF
-------------------+----classes
--------------------------+----test
--------------------------------+----RTSite.class

Too many things to count.
"ClassNotFoundException" isn't strange. Sounds like you didn't deploy your Web app properly.
Is RTSite a class that you wrote? Where is the .class file located? (Hint: Should be in the WEB-INF/classes directory for your Web app, in its package directory structure.)
Tomcat won't deal with any servlets or Beans that aren't in a package. If you aren't using packages, you'd better start.
You should not be putting your app in /ROOT. Learn how to deploy Web apps to Tomcat properly. The Tomcat site has "Your First Web App" to show you how.
You shouldn't have scriptlet code in a JSP like that. Better to learn JSTL.
Your Web app should be self-contained. I'd expect to see everything I needed within the Web context. Tossing files like that site.dat just anywhere in the file system is a bad idea.
The JSP is compiled to a servlet and run on the host server. I'll assume that you know this, and will place that sites.dat file accordingly.
I'd always prefer a relational database to a static text file in the file system, but that's just me.
That's enough for now.
%

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