EJB3: StandardWrapper.Throwable

[rotten_ritz]

I am new to EJB developmet, so i started off by writing a simple session bean which just returns a string. And I have a servlet which displays the returned string.

I followed a tutorial and came up with the following files.

TestStateless.java
package com.j3ltd.test.ejbs;
import javax.ejb.Remote;

@Remote
public interface TestStateless {
public String testBean();
}

TestStatelessBean.java
package com.j3ltd.test.ejbs;

import javax.ejb.Stateless;
import com.j3ltd.test.ejbs.TestStateless;


public @Stateless class TestStatelessBean implements TestStateless {

public String testBean() {
return "the server returned this string";
}
}


TestStatelessEJBServlet.java

package com.j3ltd.test.web;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.naming.*;
import java.io.*;
import com.j3ltd.test.ejbs.*;

public class TestStatelessEJBServlet extends HttpServlet {
private TestStatelessBean statelessBean;

public void init() {
try {
InitialContext ctx = new InitialContext();
statelessBean = (TestStatelessBean) ctx.lookup("TestStatelessBean/remote");

} catch (NamingException e) {
e.printStackTrace();
}
}

public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
PrintWriter writer = resp.getWriter();
writer.write("The stateless bean returned this string: " + statelessBean.testBean());
}
}

I have bundled the web.xml and the servlet in a .war file and the bean interface and implementation in an .ejb3 file along with jndi.properties file.

when i try accessing the servlet the following is the error. I think theres a problem with the binding of the bean, and the lookup is failing. Im using JBoss 4.2.1 and eclipse 3.1
Can someone help me wid this? the stack trace is

01:48:32,055 INFO [Server] JBoss (MX MicroKernel) [4.2.1.GA (build: SVNTag=JBoss_4_2_1_GA date=200707131605)] Started in 32s:968ms
01:49:24,169 ERROR [[/TestInstallation]] StandardWrapper.Throwable
java.lang.ClassCastException: $Proxy70
at com.j3ltd.test.web.TestStatelessEJBServlet.init(TestStatelessEJBServlet.java:18)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
01:49:24,169 ERROR [[TestStatelessEJBServlet]] Allocate exception for servlet TestStatelessEJBServlet
java.lang.ClassCastException: $Proxy70
at com.j3ltd.test.web.TestStatelessEJBServlet.init(TestStatelessEJBServlet.java:18)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

[jaikiran]

private TestStatelessBean statelessBean;

public void init() {
try {
InitialContext ctx = new InitialContext();
statelessBean = (TestStatelessBean) ctx.lookup("TestStatelessBean/remote");

} catch (NamingException e) {
e.printStackTrace();
}
}

Change the code to cast the returned object to the interface instead of the bean implementation class:

private TestStateless statelessBean;

public void init() {
try {
InitialContext ctx = new InitialContext();
statelessBean = (TestStateless) ctx.lookup("TestStatelessBean/remote");

} catch (NamingException e) {
e.printStackTrace();
}
}

[rotten_ritz]

Thnx a lot jaikiran....I shud've known better :-)