Problem w/ InitialContext

Question

Here is my issue:
1. I have and stateless session EJB deploy to OC4J (the preview release).
2. I have a servlet that access the the EJB using the "RMInitialContextFactory" factory.
3. When I deploy the servlet to Tomcat on a different box it works fine.
4. When I deploy the servlet to the OC4J server that is is holding the ejb (two different ear files/packages) the servlet will error out w/ a class cast exception when I attempt to
narrow the return from context lookup.
I have noticed that the class that is returned by the context lookup (to get the ejb) is DIFFERENT when the servlet is run on tomcat vs OC4J.
Tomcat returns a "__Proxy0" object on the context lookup
OC4J returns a "TxGetHome_StatelessSessionHomeWrapper"
So how can I deploy a servlet to OC4J that uses an EJB that previously deployed to the server (ie they are not in the same application). What factory/context magic is required here?
And what is the difference between "RMInitialContextFactory" and "ApplicationClientContextFactory" they are both used when the client is comming from a different VM right?

Answer 1

First, thanks for helping!
However,
I am not trying to get at an EJB in the same application as the servlet(that does work). The EJB is in a different application than the servelt.
I can access the EJB from a remote container , on the same box (ie Tomcat) with tht following code:
Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY,"com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, SECURITY_PRINCIPAL);
env.put(Context.SECURITY_CREDENTIALS, SECURITY_CREDENTIALS);
env.put(Context.PROVIDER_URL,"ormi://localhost/ParametricData");
Context ctx = new InitialContext(env);
TxGetHome pHome = (TxGetHome)ctx.lookup("TxGet");
However if I deploy servlet with this code to OC4J it will throw a class cast excpetion on the last line (work fine in Tomcat). Looks like a classloader issue.
So how would I access the EJB "TxGet" in application "ParametricData" from a servelt NOT in the "ParametricData" application?
Are you telling me that I can use "Context ctx = new InitialContext()" to get at an EJB in a different application than the servlet? When I try this is does not work.
Page 2-31 in the servlet developers guide has an section entitled "EJB Lookup Outside the Application" { see I have read the docs :-) } gives an example of lookuping up an EJB using
HelloHome hh = (HelloHome) (new InitialContext().lookup("ormi://host:port/appname/env/ejb/HELLOEJB"); This does not work either. I have tried the following and it can not find the EJB:
TxGetHome pHome = (TxGetHome)new InitialContext().lookup("ormi://localhost:23971/ParametricData/env/ejb/TxGet");
I know my servlet and ejb work because I can use the ejb from the servlet when I deploy the servlet Tomcat and connect w/ RMIInitialContextFactory.