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RMI UnicastRemoteObject

Radi Hadzhiyski
Ranch Hand

Joined: Jun 30, 2009
Posts: 47


When i write my implementing class, that implements the interface, that implements the Remote, i have:

then i have to define a default constructor, that does nothing but defines the RemoteException:

or constructor that does something:

but this means i invoke because of the inheritance the default consttructor of the Unicast...:
Creates and exports a new UnicastRemoteObject object using an anonymous port.

but if i add the following to my constructors:

then because of the inheritance:
Creates and exports a new UnicastRemoteObject object using the particular supplied port.

-In both cases, my program runs well, what is the difference between anonymous port and particular supplied port?
-Should the particular supplied port be the same like this one by the createRegistry (on with the server listens for
incomming connections)?

SCJP 1.6 (91%), SCJD
Roel De Nijs

Joined: Jul 19, 2004
Posts: 8384

Hi Radi,

I didn't extend from UnicastRemoteObject. I just used the exportObject of it with port number 0.

And when I create the registry the port number (chosen by the user) comes into play. So don't think that value has any value (in this assignment).

Kind regards,

SCJA, SCJP (1.4 | 5.0 | 6.0), SCJD
Radi Hadzhiyski
Ranch Hand

Joined: Jun 30, 2009
Posts: 47
ok, the UnicastRemoteObject.exportObject(object, port) has the same meaning like
when you extend the UnicastRemoteObject and invoke the constructor with port, but
what this port means, is an enigma for me
Apparently this has nothing to do with the port by the createRegistry thing, because it works
in the both way, but anyway...
I agree. Here's the link:
subject: RMI UnicastRemoteObject
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