> EJB is a higher level of abstraction in top of RMI
Not necessarily. There are EJB implementations around
which abstract CORBA as well.
Karsten
______________________________ Reply Separator _________________________________
Subject: UNAUTHENTICATED: Re: opinions please
Author: jgonzalez at unix,[EMAIL PROTECTED]
Date: 11/04/2000 09:51
Tom,
It isn't a one or the other issue. If you wanted to find an equivalent of
CORBA in the java world, you should take a look to RMI (Remote Method
Invocation), the architecture for distributed applications written entirely in
java language. These two architectures began evolving separately and both of
them stablishes a way to call methods of objects in a remote machine, with CORBA
having the advantage of language independence. Anyway they are converging, as
RMI can be used with IIOP, the communication protocol of CORBA, so you can
achieve interoperability between CORBA and RMI objects.
So what about EJBs? EJB is a higher level of abstraction in top of RMI. EJBs
are (basically) RMI objects that run on a EJB server. This server provides to an
EJB and its clients several services that would be provided by you if you were
using just CORBA or RMI. These services include security, persistence,
transaction management, control of life cycle,... (This is a very, very
simplistic explanation)
So it isn't a question of EJB or CORBA, it's a question of deciding if you
need all the advantages provided by EJBs, or you just can do with CORBA and/or
RMI...
Hope this helps, regards
Jose
Tom Jansto wrote:
> morning folks,
> i'm trying to gather some information here on a project i'm fixing to
> implement. what i am looking for is information referring to the pros and
> cons of using ejb over corba, or vice versa. it seems to me that the two
> are pretty much a one or the other implementation, although i'm not quite
> sure of that, or why it is if it is true. i would like to hear opinions on
> the subject. also, has anyone implemented an n-tier solution using ejb that
> will scale to support between 1000 to 1500 cuncurrent users? again, thanks,
> and i appreciate the help.
>
> tom
> tom jansto
> [EMAIL PROTECTED]
> "For by grace are ye saved through faith, and that not of yourselves; It is
> the gift of God, not of works, lest any man should boast."
> Ephesians 2:8-9
>
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