bean not found within scope on tomcat

Hello,

My web app works fine on my localhost and when deployed as a war file to Oracle Application Server. We are now trying to switch from OAS to Tomcat 5.5.

I am seeing the error 'javax.servlet.ServletException: bean BTListGridSpeciesKeySitesBean not found within scope'.

I am putting the bean in the session in a servlet and then using the <jsp:useBean/> tag as below. Why can't it get the bean out of the session again ?

As this works on my localhost and OAS I am wondering if tomcat does not like the way the war file is packaged. The tomcat log says:

INFO: Deploying web application archive birdtrack.war
11-Feb-2009 11:27:17 org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\birdtrack\WEB-INF\lib\geronimo-spec-j2ee-1.4-rc4.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class

Has my problem got something to do with this error, or is it completely unrelated ?

thanks

<!--servlet code putting the bean into the session-->
    protected void processListGridSpeciesKeySitesForm(HttpServletRequest request,
                                               HttpServletResponse response,
                                               BTSessionBean session) throws
        ServletException, BTException,
        SQLException, IOException
 
    {
      String op = (String)this.extractString(request, Constants.FORM_OP,
                                             null, false);
      Hashtable fieldTable = this.extractFieldsForKeySites(request, response);
      BTListGridSpeciesKeySitesBean listBean = new BTListGridSpeciesKeySitesBean(session, fieldTable);
 
      session.getServletSession().setAttribute("BTListGridSpeciesKeySitesBean", listBean);
    }
 
 
<!-- JSP code -->
<jsp:useBean id="BTSession" scope="session" type="Bto.BT.BTSessionBean"/>
<jsp:useBean id="BTListGridSpeciesKeySitesBean" scope="session" type="Bto.BT.DataBeans.BTListGridSpeciesKeySitesBean"/>
 
<!-- I then use the bean as below-->
String bufferSize = BTListGridSpeciesKeySitesBean.getBufferSize();

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