PortableRemoteObject.narrow

[Saurabh Chaubey]

Can anyone explain me in detail the need to do PortableRemoteObject.narrow() for getting the Home Object Stub.

Regards,
Saurabh

[Herman Schelti]

hi Saurabh Chaubey,

according to the specs:
(5.4) Narrowing remote types requires the use of javax.rmi.PortableRemoteObject.narrow rather than Java language casts.

(6.10) Note: Programs using the cast operator for narrowing the remote and remote home interfaces are likely
to fail if the Container implementation uses RMI-IIOP as the underlying communication transport.

To me that's detail enough...

Herman

[Vinay Raj]

I believe this link gives a more lucid explanation.

[Saurabh Chaubey]

Thanks Herman and Vinay for your response.

Regards,
Saurabh

[Cameron Wallace McKenzie]

My understanding, and this was more of an explaination that made me happy, as opposed to one that may be technically correct, is that the object that gets returned could potentially have a whole whack of CORBA baggage related to it, especially if it comes from a different vendors EJB container. The narrow forces the returned object through a bit of a baggage screening process, removes any sharp items, and returns a clean, handsome object for your Java programs to work with.

[Jeroen T Wenting]

Pretty much. In fact what's returned is a complete CORBA stub which needs to be turned into a Java class instance before it's any good to the JVM.