rmi, two binding methods, what differences?

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John_Woo - 20 Aug 2006 13:19 GMT

Hi,

I'm wondering, which better/differences, in the following two rmi
binding methods:

A.
java.rmi.registry.LocateRegistry.createRegistry(defport);
Services server = new ServicesImpl();
Naming.rebind("rmi://ahost:aport/aService", server);

B.
Registry registry = LocateRegistry.getRegistry();
registry.rebind("aName", astubObject);

It seems A has to use a port, which may need a special setting over
firewall; for B, what's the port number?

--
Thanks
John
Toronto

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staudinger - 20 Aug 2006 17:28 GMT

John_Woo schrieb:

> B.
> Registry registry = LocateRegistry.getRegistry();
> registry.rebind("aName", astubObject);
>
> It seems A has to use a port, which may need a special setting over
> firewall; for B, what's the port number?

1099 by default.

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John_Woo - 20 Aug 2006 22:20 GMT

> John_Woo schrieb:
>
[quoted text clipped - 6 lines]
>
> 1099 by default.

what about if 1099 already in used?

what significant difference between A & B?

--
Thanks
John

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EJP - 21 Aug 2006 01:36 GMT

>>John_Woo schrieb:
>>
[quoted text clipped - 8 lines]
>
> what about if 1099 already in used?

It shouldn't be because it is reserved by IANA for the RMI Registry. So
if it's in use it *should* mean that the RMI Registry is already running.

> what significant difference between A & B?

The significant difference is that A starts the registry on port
'defport' and B assumes it is already running on port 1099.

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John_Woo - 21 Aug 2006 15:22 GMT

> >>John_Woo schrieb:
> >>
[quoted text clipped - 16 lines]
> The significant difference is that A starts the registry on port
> 'defport' and B assumes it is already running on port 1099.

Thanks lots,

the port 1099, in my unix, may already be used by other app (not java).
in this case,
how would you think the default port for rmi?

John

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EJP - 22 Aug 2006 02:45 GMT

> the port 1099, in my unix, may already be used by other app (not java).
> in this case,
> how would you think the default port for rmi?

I don't understand the question but I've already told you that port 1099
is reserved by IANA, which is the Internet Assigned Numbers Authority,
for the RMI Registry. So any other application that is using 1099 is
non-compliant and should be fixed or trashed.

If you can't get the application using 1099 fixed, use another number,
obviously.

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rmi, two binding methods, what differences?

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