Getting class cast exception in Web application.

Question

I have a web application deployed using standard specs for deployment. I
          have and web-inf directory with a web.xml file set up. All the servlet
          classes are in the classes sub-directory of web-inf.
          If I deploy this application using the Tomcat application server,
          everything works as expected. When I deploy this application using the
          Weblogic software, I can get to the initial page, put once I select a
          link that calls the main servlet, I get a classcast exception. Both the
          Tomcat and Weblogic software point to the same directory for the
          application.
          I double checked and made sure that no other instances of my servlet
          classes exist anywhere else in the class path.
          Any one have any thoughts or suggestions. I am perplexed that this web
          app runs fine under the Tomcat software and yet...
          Thanks.
          Paul Garduno
          

Answer 1

Thanks for your reply. I am not using any EJBs. From what I have
          gathered since writing my message, this may be the "dreaded" class cast
          exception (although I don't know why since it runs under Tomcat).
          Basically, the initial page is displayed. When you select the SEARCH
          button (for example), the request goes to a servlet which puts a vector
          of custom classes into a session parameter. The request is then
          forwarded to the JSP page which uses the information in the classes to
          help build some information on the page. The first line in the JSP is
          processed (a simple output line to the system console) and then the
          classcast exception occurs.
          According to the info that I have seen, this shouldn't happen since I am
          not changing either the servlet or JSP files which would mean that
          nothing should be re-compiled.
          I have a call into tech support. I will post their answer and copy you
          on the message.
          Thanks.
          Paul
          Cameron Purdy wrote:
          >
          > Are you using EJBs hosted on the same instance of WebLogic? If so, delete
          > the home/remote interfaces from your web deployment. Otherwise, post the
          > exception listing ....
          >
          > Cameron Purdy, LiveWater
          >
          > "Paul Garduno" <[email protected]> wrote in message
          > news:[email protected]...
          > > I have a web application deployed using standard specs for deployment. I
          > > have and web-inf directory with a web.xml file set up. All the servlet
          > > classes are in the classes sub-directory of web-inf.
          > >
          > > If I deploy this application using the Tomcat application server,
          > > everything works as expected. When I deploy this application using the
          > > Weblogic software, I can get to the initial page, put once I select a
          > > link that calls the main servlet, I get a classcast exception. Both the
          > > Tomcat and Weblogic software point to the same directory for the
          > > application.
          > >
          > > I double checked and made sure that no other instances of my servlet
          > > classes exist anywhere else in the class path.
          > >
          > > Any one have any thoughts or suggestions. I am perplexed that this web
          > > app runs fine under the Tomcat software and yet...
          > >
          > > Thanks.
          > >
          > > Paul Garduno