I deploy a ear on my web jboss server(4.0.3),it contains a web module and EJBs.
when I try to creating a remote interface ,it occurs a exception,

Source code:

firstServlet.java
......
Hashtable env=System.getProperties();
env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL,"jnp://localhost");
Context ctx=new InitialContext();
Object obj=ctx.lookup("Test");
TestHome th=(TestHome)PortableRemoteObject.narrow(obj,TestHome.class);
Test t=th.create(); // line 35
out.println(t.SayHello());
.......

TestBean.java:

import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.CreateException;

public class TestBean implements SessionBean {
SessionContext sessionContext;
public void ejbCreate() throws CreateException {
}

public void ejbRemove() {
}

public void ejbActivate() {
}

public void ejbPassivate() {
}

public void setSessionContext(SessionContext sessionContext)

{ this.sessionContext = sessionContext; }

public String SayHello()

{ return "Hello World!"; }

}

and exception:

java.lang.ClassCastException: $Proxy51 at linuxtext.s3.doGet(s3.java:35) at javax.servlet.http.HttpServlet.service(HttpServlet.java:697) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595)

what's the problem?
I want to deploy ,need help ! ! !