I am trying to write a mini test MVC with JSP as a test with Tomcat 3.2B
I wrote two classes :
<WEBAPP>/ROOT/WEB-INF/classes/LocationModel
<WEBAPP>/ROOT/WEB-INF/classes/LocationController
I am creating a session object in both the JSP and the Servlet with
public class LocationController extends HttpServlet
{
public void doGet( HttpServletRequest req, HttpServletResponse res )
throws ServletException, IOException
{
// Get the current session object, create one if necessary
HttpSession session = req.getSession(true);
String action = req.getParameter("action");
LocationModel model = (LocationModel)
session.getAttribute("location_model"); /* at
LocationController.doGet(LocationController.java:62) */
if ( model == null ) {
// If the session does not have a model then create
// a new one and add it to the session
model = new LocationModel();
session.setAttribute("location_model", model );
}
// ....
RequestDispatcher rd =
getServletContext().getRequestDispatcher("locationview.jsp");
rd.forward( req, res );
}
I have also put the model in the session inside the JSP (locationview.jsp) and
add a form with action that calls "/servlet/LocationController"
<%
LocationModel model = (LocationModel)
session.getAttribute("location_model");
if ( model == null ) {
model = new LocationModel();
session.setAttribute("location_model", model );
}
%.
Why do I get a class cast exception?
Is tomcat telling me it cant find the class?
Is the session the same across the JSP and controller servlet?
How does Tomcat find the Java object classes it uses?
Any help appreciated
Error: 500
Location: /servlet/LocationController
Internal Servlet Error:
java.lang.ClassCastException: LocationModel
at LocationController.doGet(LocationController.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:597)
at org.apache.tomcat.servlets.InvokerServlet.service(InvokerServlet.java:257)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
at
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
at java.lang.Thread.run(Thread.java:484)
--
Peter Pilgrim
G.O.A.T
"The Greatest of All Time"
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