Why does java.rmi.Naming not implement interface java.rmi.Registry?

[Jan Schulze]

The class Naming (from package java.rmi) provides the methods bind,
list, lookup etc. Those methods are defined in the interface Registry
(from package java.rmi). But according to the SDK API docs Naming does
not implement that interface. Is that true or a misprint? If it is
true, could anyone explain?

Regards
Jan

 

[Esmond Pitt]

The class Naming (from package java.rmi) provides the methods bind,
list, lookup etc. Those methods are defined in the interface Registry
(from package java.rmi). But according to the SDK API docs Naming does
not implement that interface. Is that true or a misprint? If it is
true, could anyone explain?

There are two answers to this:

1. Because all the methods of Naming are static. Otherwise you would
have to get an instance of it, which would be the same as
LocateRegistry.getRegistry(), so what would be the point?

2. It doesn't strictly speaking implement the Registry interface,
because it understands (and returns) rmi:// URLs, where the Registry
interfaces only accept and return object names.

EJP