Session Bean Lookup Error

[gurrie09]

HiAll,

I am trying to gettting a very simple application running, involving a stateless session bean and the client. I have managed to get the session bean deployed and it is running. My problem comes when I lookup the session bean from the client application. I get the following error.

java.lang.ClassCastException: org.jnp.interfaces.NamingContext
at com.gurrie.simple.client.SimpleSessionBeanClient.main(SimpleSessionBeanClient.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)


The code for my client is as follows :

public class SimpleSessionBeanClient {
public static void main(String[] args) {
try {
InitialContext ctx = new InitialContext();
SimpleSession simpleSession = (SimpleSession) ctx.lookup("SessionTest");

for (int i = 0; i < args.length; i++) {
String returnedString = simpleSession.echoString(args);
System.out.println("sent string: " + args + ", received string: " + returnedString);
}
} catch (Throwable e) {
e.printStackTrace();
}
}
}

My class path contains the following jars :

C:\Program Files\jboss-4.0.4RC1\lib\concurrent.jar
C:\Program Files\jboss-4.0.4RC1\server\default\deploy\jboss-aop-jdk50.deployer\jboss-aop-jdk50.jar
C:\Program Files\jboss-4.0.4RC1\server\default\deploy\jboss-aop-jdk50.deployer\jboss-aspect-library-jdk50.jar
C:\Program Files\jboss-4.0.4RC1\lib\jboss-common.jar
C:\Program Files\jboss-4.0.4RC1\server\default\deploy\ejb3.deployer\jboss-ejb3.jar
C:\Program Files\jboss-4.0.4RC1\server\default\deploy\ejb3.deployer\jboss-ejb3x.jar
C:\Program Files\jboss-4.0.4RC1\server\default\lib\jboss-remoting.jar
C:\Program Files\jboss-4.0.4RC1\server\default\lib\jboss-transaction.jar
C:\Program Files\jboss-4.0.4RC1\server\default\lib\jboss.jar
C:\Program Files\jboss-4.0.4RC1\server\default\lib\jnpserver.jar

Any help would be greatly appreciated!

Regards,
Brian

[jaikiran]

SimpleSession simpleSession = (SimpleSession) ctx.lookup("SessionTest");

ctx.lookup will return you a local/remote home object. So your code should be something like:

SimpleSessionRemoteHome simpleSessionHome = (SimpleSessionRemoteHome) ctx.lookup("SessionTest");

or

SimpleSessionLocalHome simpleSessionHome = (SimpleSessionLocalHome) ctx.lookup("SessionTest");

and once you get hold of the home object, you will have to invoke:

SimpleSession simpleSession = (SimpleSession) home.create();

[gurrie09]

Are you sure that is correct? This code is copied from a Javaworld article, on EJB 3?

[jaikiran]

Sorry, i wasnt aware you were using EJB3. Well, i havent worked with EJB3 so not sure why you are seeing the exception.

[jaikiran]

One of the easiest way to debug this, would be:

Object simpleSession = ctx.lookup("SessionTest");
System.out.println("Type of object : " + simpleSession.getClass().getName());

This will help you in identifying the type of object that is being returned by the lookup() method.

[gurrie09]

No problem! Thanks for the reply.

The type being returned is org.jnp.interfaces.NamingContext?