Casting problems getting a home I/F of an EJB in another app when debuging a servlet

(Jdeveloper version = 9.0.2.798, OC4J Application Server version = Oracle9iAS (9.0.2.0.0))
I am trying to debug a multi-tier application using the embedded application server. Servlets and EJBs within that application need to call EJBs contained within a second application (Horus).
I have set up the embedded application server to run this second application automatically by adding the following entry into its server.xml
<application auto-start="true" name="Horus" path="M:\Studio\build\production\java\Server\Obfuscate\J2EE_HOME\Horus\Horus.xml"/>
I then start the embedded application server by debugging my servlet project, 'intermediateServlet'. I know the second application is running correctly in the embedded application server because I can access it from a separate client.
In the 'intermediateServlet', I want to obtain a reference to a Dispatcher EJB held in the Horus application. This EJB has the following properties
     ejb-name     = com.internal.server.Dispatcher
     home interface     = com.internal.server.DispatcherHome
     bean class     = com.internal.server.DispatcherEJB
     remote interface= com.internal.server.Dispatcher
The following code is executed during the container's call to my servlet init( context ) method to try and get the appropriate home interface.
Context context = null;
Object tempRemoteIF1 = null;
Object tempRemoteIF2 = null;
Properties h = null;
h = new Properties();
h.put( Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory" );
h.put( Context.PROVIDER_URL, "ormi://127.0.0.1:23891/Horus");
h.put( Context.SECURITY_PRINCIPAL, "user0" );
h.put( Context.SECURITY_CREDENTIALS, "password" );
context = new InitialContext (h);
tempRemoteIF1 = context.lookup( "com.internal.server.Dispatcher" );
tempRemoteIF2 = javax.rmi.PortableRemoteObject.narrow
tempRemoteIF1,
Class.forName( "com.internal.server.DispatcherHome" )
The context.lookup call seems to work fine, returning an object of the class
     DispatcherHome_StatelessSessionHomeWrapper5
Which I presume is a containter generated class implementing the home interface. To help confirm this,
the object has a property beanName that has the value "com.internal.server.Dispatcher".
The problem occurs on the next line, when I check whether I can cast the object to the home interface using ProtableRemoteObject.narrow(). This gives the following exception.
java.lang.ClassCastException
     java.lang.Object com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(java.lang.Object, java.lang.Class)
          PortableRemoteObject.java:296
     java.lang.Object javax.rmi.PortableRemoteObject.narrow(java.lang.Object, java.lang.Class)
          PortableRemoteObject.java:137
     com.internal.server.Dispatcher com.Studio.servlet.intermediateServlet.getDispatcherRef(java.lang.String, java.lang.String, java.lang.String)
          intermediateServlet.java:601
     void com.Studio.servlet.intermediateServlet.init(javax.servlet.ServletConfig)
          intermediateServlet.java:150
     com.evermind.server.http.ServletInstanceInfo com.evermind.server.http.HttpApplication.loadServlet(com.evermind.util.ByteString)
          HttpApplication.java:1669
     com.evermind.server.http.ServletInstanceInfo com.evermind.server.http.HttpApplication.findServlet(com.evermind.util.ByteString)
          HttpApplication.java:4001
     javax.servlet.RequestDispatcher com.evermind.server.http.HttpApplication.getRequestDispatcher(com.evermind.util.ByteString, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
          HttpApplication.java:2200
     boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
          HttpRequestHandler.java:580
     void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
          HttpRequestHandler.java:243
     void com.evermind.util.ThreadPoolThread.run()
          ThreadPoolThread.java:62
Interestingly, if I use practically the same code, to obtain the home interface of an EJB that is defined in the application that I am debugging, the cast works perfectly. The returned object looks identical, apart from the name to the DispatcherHome_StatelessSessionHomeWrapper5 mentioned above.
Could the error possibly be because I need to declare 'Horus' as a parent application of the application I am debugging? If it is how do I do this?
Many thanks in advance for any help with this one.
Mark.

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