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I am running a Hello World example for java RMI 1) I run the registry in an empty folder motta@motta-laptop ~/tmp $ rmiregistry 2) I start the HTTP server to retrieve the classes at runtime. The download folder contains the remote interface for the client-server motta@motta-laptop ~/download $ java NanoHTTPD 8080 3) I start the server passing the java.rmi.server.codebase property as suggested in the java RMI tutorial motta@motta-laptop ~/server $ java -Djava.rmi.server.codebase="http://localhost:8080" WarehouseServer The RMI registry is not contacting the HTTP server and is throwing an exception (see details after the question). But if I do the following 1) Start the rmi registry with the java.rmi.server.codebase property motta@motta-laptop ~/tmp $ rmiregistry -J-Djava.rmi.server.codebase="http://localhost:8080/" 2) Start the HTTP server as before 3) Start the server without any option motta@motta-laptop ~/server $ java WarehouseServer it works, but why? It seems that with the first procedure the RMI registry is ignoring the java.rmi.server.codebase property Thank you ================================= I am running java version "1.7.0_21" Java(TM) SE Runtime Environment (build 1.7.0_21-b11) Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode) The exception from the RMI registry Constructing server implementation... Binding server implementation to registry... Exception in thread "main" java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: java.lang.ClassNotFoundException: Warehouse at sun.rmi.server.UnicastServerRef.oldDispatch(Unicast

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