ClassCastException after JNDI lookup
Hello,
I really hope someone can help me.
I have been reading trough a lot of faqs and forums but it
simply seams that I am not able to solve this newbie problem.
I am newbie using EJB3 (and EJB in general).
I installed JBOSS 4.0.4GAPatch1 on my windows xp sp2 machine.
I am trying to deploy a Stateless session bean; a typical HelloWorldBean.
Following information:
jmx-console show
+- UserTransaction (class: org.jboss.tm.usertx.client.ClientUserTransaction)
+- HelloWorldBean (class: org.jnp.interfaces.NamingContext)
| +- local (proxy: $Proxy60 implements interface ejb.HelloWorldLocal,interface org.jboss.ejb3.JBossProxy,interface javax.ejb.EJBLocalObject)
| +- remote (proxy: $Proxy59 implements interface ejb.HelloWorldRemote,interface org.jboss.ejb3.JBossProxy,interface javax.ejb.EJBObject)
My HelloWorldBean
public class HelloWorldBean implements ejb.HelloWorldRemote, ejb.HelloWorldLocal{
/** Creates a new instance of HelloWorldBean */
public HelloWorldBean() {
}
public String getHelloWorld() {
return "Hello World!";
}
}
My java client
public class Main {
/** Creates a new instance of Main */
public Main() {
}
public static void main(String[] args) {
Context context = null;
try {
context = getInitialContext();
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String myBean = "HelloWorldBean";
Object hello = null;
try {
hello = context.lookup(myBean);
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(myBean + " is bound to " + hello);
Class[] c = hello.getClass().getInterfaces();
for (int i=0;i<c.length;i++){
System.out.println(c.getName());
}
HelloWorldRemote helloSession = null;
try {
helloSession = (HelloWorldRemote)PortableRemoteObject.narrow(hello, HelloWorldRemote.class);
} catch (ClassCastException e) {
e.printStackTrace();
}
}
public static Context getInitialContext()
throws javax.naming.NamingException {
Properties p = new Properties();
p.put("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
p.put("java.naming.provider.url","jnp://localhost:1099");
p.put("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
return new InitialContext(p);
}
}
The error output
HelloWorldBean is bound to org.jnp.interfaces.NamingContext@111a3a4
javax.naming.Context
java.io.Serializable
java.lang.ClassCastException
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
at Main.main(Main.java:62)
Caused by: java.lang.ClassCastException: org.jnp.interfaces.NamingContext
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)
... 2 more
I do not use any jboss.xml or other xml descriptors. I hope that is ok, as i can lookup the bean at least; Please correct me if I am wrong.
So as far as I can see, I can lookup the context; but I have no idea why it fails then.
Any ideas.
thanks
walter.
