In JDK1.2 rmic, the definition of a legal remote interface is "one that extends
java.rmi.Remote, either directly or indirectly, and extends any other interface
that does not extend java.rmi.Remote directly or indirectly, as long as all the
methods in the extended interface contain java.rmi.RemoteException (or it
superclasses, but not Throwable) in it throws clause". JDK1.1 rmic should
support the same definition of remote interfaces. RMI/IIOP will support
this definition and will be capable of running on top of JDK1.1.6 and
JDK1.2. To make sure that the remote interface definition is consistent
this change to the definition of a remote interface should be made (previously
remote interfaces were not allowed to extend non-remote interfaces at all).