Re: advantages of EJB over RMI?

[Francis Ho - Sun Professional Services]

"A mailing list for Enterprise JavaBeans development" <[EMAIL PROTECTED]> 
wrote:
>Date: Wed, 10 Nov 1999 09:46:57 -0500
>At 10:26 AM 10/23/99 +0200, Karl-Fredrik Blixt wrote:
>> > Seerangan Saminathan wrote:
>> > > What is the advantages of EJB over RMI?
>> >
>> > .. as opposed to? If you say "advantage" you'll need to have something
>> > to have an "advantage over".
>> >
>>My guess is that Seerangan meant what advantage EJB has over RMI.
>>
>>Seerangan, RMI and EJB are not competing techniques; EJB uses RMI for
>>communication between the client and the EJB server.
>
>         I was under the impression that EJB is independent from the
>         connection technology.  EJB probably prefers RMI, but why can't
>         you use CORBA/IIOP to talk to an EJB server?  Or sockets?
>         or even non-Java?
>

RMI is the default interface for distributed objects in Java (i.e. the method
signatures).  However, the underlying implementation/protocol
is not specified in the EJB spec.  So you could use RMI that runs on top of IIOP,
DCOM, or smoke signals {if they support pass-by-value}  :-)

The default RMI implementation that comes with Sun's JDK uses JRMP (or classic RMI).
However, other vendors have implemented their own.  For example, WebLogic uses 
TengahRMI
(or something to that effect).


francis
--
The best thing about standards is that
there are so many to choose from.

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