This is not needed, because you are using inheritance and your business implementation is not a (specialized version of the) UnicastRemoteObject. And if you wanted to extend your Business implementation from another class, you will have a problem too (because Java doesn't support multiple inheritance as you know).
Daniel Breitner wrote:My Business Implementation didn´t extend UnicastRemoteObject.
Daniel Breitner wrote:Now everything is fine
Roel De Nijs wrote:Hi Daniel,
And it is the BusinessServiceImpl which gets exported and is exposed through RMI.
You don't talk directly with the RMI registry, but through a stub (client) and a skeleton (server). These files are generated using the RemoteBusinessService.