RE: Java on AS/400 -- JAVA400-L

Shailu,
I have attached the document that you requested, I apologize for the delay.
After you read the attachment, if you have any feedback or questions please
feel free to e-mail me.  I am trying to get the document as clean and tight
as I can before I send it out to our AS/400 customers who have requested it.

Thanks,
Richard


-----Original Message-----
From: owner-java400-l@midrange.com
[mailto:owner-java400-l@midrange.com]On Behalf Of Shailaja Rao
Sent: Thursday, February 10, 2000 7:01 PM
To: JAVA400-L@midrange.com
Subject: RE: Java on AS/400



I would like have some information about the awt on AS/400, could mind
sending it me?

Thanks
Shailu





"Richard Dean" <rddean@gdi.net>@midrange.com on 02/10/2000 11:56:12 AM

Please respond to JAVA400-L@midrange.com

Sent by:  owner-java400-l@midrange.com


To:   <JAVA400-L@midrange.com>
cc:

Subject:  RE: Java on AS/400


Hi Jay,

You can not run a Java program on the AS/400 that access the Awt or Swing
classes.  If you want to use those classes you will have to write an
application or an applet that will run on your PC, and then have it access
the as/400 data.

If this throws you for a loop, send me an e-mail(rddean@gdi.net) and I will
e-mail you some of the stuff that I collected when I was getting going
(mostly helpful discussions from this list) which explains applications,
applets, and servlets; and how they relate to Java on the 400.

Good luck,
Richard


-----Original Message-----
From: owner-java400-l@midrange.com
[mailto:owner-java400-l@midrange.com]On Behalf Of * Jay.D. Fernando *
Sent: Thursday, February 10, 2000 10:46 AM
To: JAVA400-L@midrange.com
Subject: Java on AS/400


Hi Folks,
             Is there anybody working with Java on AS/400....I need to know
how to use JAVA SWING class's on the AS/400.....our version of OS/400 is
V4R3...we guys have just now loaded AS/400 Developer Kit for
Java....checked
out some simple pgms...they are working fine...but cant use AWT or SWING
either....can anybody enlighten me on this issue.

Thanks
Jay
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Applications vs. Applets vs. Servlets
-----------------------------------
Date   : 02/18/2000
Contact: Richard Dean (rddean@gdi.net)

(Please note this document is a quick guide.  It is only intended
to give you a quick understanding of the 3 models.  If you need
more detail or clarification please feel free to e-mail me.)

I created this document to help the I.T. staff of our customers
get a better understanding of the three major models available
to leverage Java and their AS/400. 

General Definitions:

APPLICATION - A Java application is like any program written with
any other language.  If you have ever written a COBOL, RPG, or CL
program on the AS/400 then you have written what would be 
considered an application.  The confusion that comes up with
applications is how does the AS/400 handle the GUI objects of the
application.  A simple application written on your PC that prints
out your name and address, can be easily run on your AS/400.  The
problem comes when you write an application on your PC that uses
the AWT/Swing classes for a GUI interface, and then you want to
run it on your AS/400.  The AS/400 can not run applications that
use these GUI classes (though there is something called remote AWT
that allows you to run the application on the AS/400 and transmit
the GUI objects to a PC client program for display, but it may be
to slow for production).  If you write a Java application that has
a GUI interface then you will have to run the application on your
PC (or some other client) and access the AS/400 data over the
network.  If you write an application that does not need a GUI
interface (i.e. A report that prints AS/400 data), then you have
the option to run the application on your PC or directly on the
AS/400.    

APPLETS - In simple terms an applet is a Java application that
runs on the PC through your browser.  The applet has full access
to the GUI classes.  Since applets automatically download onto the
PC and run, it can give you an advantage over applications.  If
you change the applet, the next time the user goes to access the
applet the browser will automatically pull down an updated copy of
the program before running it.  The time required to download an 
applet and the type of users you have will determine if this is a
good fit for you.


SERVLETS - Servlets are Java programs that are called through HTML
and Web pages.  Servlets allow you to receive input from a user
through a web page, then based on that input access/manipulate 
AS/400 data and return it to the user's browser with HTML (The
WebSphere product allows the servlet to interface with the user
through the HTTP server).  A servlet runs on the AS/400, and
interacts with the user through the web browser.  This is very
beneficial since all that is required for the user to use the
system is a web browser.  Since the servlet runs on the AS/400
there is no downloading of programs required, all the user
receives is HTML (Web Pages).  



Now that you know something about the three different models, what
is the best option for you and your AS/400?

The servlet is very intriguing for business, since everything can
be controlled from the host machine (in our case the AS/400).  All
that is required of the user to use your system is that they have
a browser loaded on their PC.  The traffic over the network is
minimal since all transactions between user and machine are
through HTML (web pages).

If HTML does not give you the interface that you require or you
require graphic intensive programs, then applications or applets
that run on your PC may be the best bet.  

The decision on which model is best may depend on the project.
Many sites use all three models in their shop.  Picking the
best model may be driven by the requirements of the current
project.

Most of our customers need the ability to leverage their existing
skill set on the AS/400 and take advantage of the Web.  With Java
you can give the users the GUI interface and the Web access that
they want, and still use your existing COBOL, RPG, and CL programs
to process that data on the back-end.