Re: EJB versus RPG/COBOL

[Dieter Bender <dieter.bender@xxxxxxxxxxxx>]

Ivan,

it depends on, what performance you try to optimize, performance of machine 
(as400) or performance of programmer (maintanability).

If you want to optimize performance on as400 by minimizing the hardware 
effort, then rpg would be the fastest, even cgi might be faster than JSP and 
Servlets.
If you want to optimize programmer performance and maintainability then a pur 
java solution with JSP and an appropriate Framework like Struts and use of a 
persistance Framework would be best. If you want to run this all on as400 it 
will tend to be slower than rpg and the hardware effort is higher (another 
poster estimated * 5)
Mixing RPG and Java is worst for maintainability, you will need both skills 
forever and your Java design is driven by rpg prerequisites.

Dieter

On Dienstag, 9. März 2004 22:45, Ivan Hurtado wrote:
> In Don Denoncourt's book titled "iSeries & AS400 -
> Java at Work", he states the following...
>
> "I see two alternatives when using Java for AS/400
> applications: one is to use RPG/COBOL for your
> business logic, and the other is to use EJB. In either
> scenario, you'd use JSP and Servlets to handle the web
> interface."
>
> I am designing a server side app, that will reside
> completely on one single AS400 machine. This
> application may be accessed by up to 500 users. This
> is the first time I design a Java app for an AS400, so
> I am considering all the choices. Does anyone know
> what the pros & cons of the two alternatives
> (RPG/COBOL vs. EJB) that Don Denoncourt mentions are?
> My main concern is performance and speed of the
> app/system (I am not concerned about the
> cross-platform issue at all in this case). I hear that
> java on as400 is NOT exactly lightning fast. Will
> using RPG for the Business Logic improve performance?
> It sounds like using RPG alleviates the system level
> concerns that EJB is supposed to help with (db
> persistence, transactin control, scalability, etc.).
> It also sounds like using RPG "could be" faster since
> RPG does not incur the cost of all the java object
> creation & garbage collection. For sure, it would help
> with coding of the new system since we have several
> legacy RPG developers and no other Java types here but
> me.
>
> Thoughts anyone?
>
> Thanks,
> Ivan
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Search - Find what you?re looking for faster
> http://search.yahoo.com
> _______________________________________________
> This is the Java Programming on and around the iSeries / AS400 (JAVA400-L)
> mailing list To post a message email: JAVA400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/java400-l
> or email: JAVA400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/java400-l.

-- 
mfG

Dieter Bender


DV-Beratung Dieter Bender
Wetzlarerstr. 25
35435 Wettenberg
Tel. +49 641 9805855
Fax +49 641 9805856
www.bender-dv.de
eMail dieter.bender@xxxxxxxxxxxx