RMI with Tomcat

If I run my java-application the Naming.lookup works correctly and also a following call to a method of this object.
But when I put this sequence to the Tomcat4.1.12 packed up in a Servlet, the Naming.lookup works correctly again, but the following call to a method of this object throws an exception.
Does I need any property-settings on my standalone WebServer?
Thanks for your help.
Kind regards
Exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.net.MalformedURLException: no protocol: Group/Tomcat
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:536)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at sun.rmi.server.ActivatableRef.invoke(ActivatableRef.java:116)
at mmch.bod.session.pcmmmi.MmmiImpl_Stub.addListener(Unknown Source)
at mmap.TrCtrl.myTest.init(myTest.java:72)
at ConnectionTest.doPost(ConnectionTest.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:247)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
...

I guess there is a whitespace in your Tomcat path, which caused the URL-related exception.

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