[jboss-user] [Beginners Corner] - EJB 3 TrailBlazer Demo Class Cast

pKraemer do-not-reply at jboss.com
Tue Feb 6 08:29:34 EST 2007


Well I know that there are several Threads about the ClassCast Problem, but nothing helped me realy - except looking that I did not have these errors.

So, I use JBoss 4.04 and started with the TrailBlazer Demo about StatelessSessionBeans.

I can start the JSP but I got a ClassCastException during it.

I have deployed it to TrailBalzerApplication.ear which contains:


  | TrailBlazerApplication.ear
  |     application.xml
  |     jboss-app.xml
  |     TrailBlazerEJB.jar
  |     TrailBlazerWeb.war
  | 

The application.xml:

  | <application xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/application_1_4.xsd">
  |   <display-name>TrailBlazerApplication</display-name>
  |     
  |   <module id="myeclipse.1170763402122">
  |     <ejb>TrailBlazerEJB.jar</ejb>
  |   </module>
  |     
  |   <module id="myeclipse.1170763401891">
  |     <web>
  |       <web-uri>TrailBlazerWeb.war</web-uri>
  |       <context-root>TrailBlazerWeb</context-root>
  |     </web>
  |   </module>
  | </application>
  | 

The jboss-app.xml


  | <?xml version="1.0" encoding="UTF-8"?>
  | <jboss-app>
  |   <loader-repository>
  |     trailblazerOne:app=ejb3
  |   </loader-repository>
  | </jboss-app>
  | 


The SessionBean

  | package trail.slsb;
  | 
  | import org.jboss.annotation.ejb.LocalBinding;
  | 
  | import javax.ejb.*;
  | 
  | @Stateless
  | @LocalBinding (jndiBinding="EJB3TrailBlazer/slsb/Calculator")
  | public class StatelessCalculator implements Calculator {
  |   
  |   public double calculate (int start, int end, double growthrate, double saving) {
  |     double tmp = Math.pow(1. + growthrate / 12., 12. * (end - start) + 1);
  |     return saving * 12. * (tmp - 1) / growthrate;
  |   }
  | 
  | }
  | 

Part of the jsp:

  |  <%@ page import="trail.slsb.*, javax.naming.*, java.text.*"%>
  |  
  |  <%!
  |    private Calculator cal = null;
  |    public void jspInit () {
  |      try {
  |        InitialContext ctx = new InitialContext();
  |        cal = (Calculator) ctx.lookup(
  |                    "EJB3Trail/StatelessCalculator/local");
  |      } catch (Exception e) {
  |        e.printStackTrace ();
  |      }
  |    }
  |  %>
  | 

There are no errors during deployment

Can anybody please help me?

Thanks

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