Public CommandAwareRpcDispatcher method signatures reference non-public classes

The public CommandAwareRpcDispatcher.invokeRemoteCommands(...) method returns a RspListFuture which is a package protected class. Likewise, the invokeRemoteCommand(...) method returns a SingleResponseFuture, which is also package protected. While this is legal, it is sloppy, as a non-package class can neither invoke these methods or override them.

These methods should either be package protected - or the visibility of the return types be made public - otherwise, they cannot be overridden.