Re: Calling java from RPG - how to increase performance -- JAVA400-L

> Unfortunately, I'm the only guy in our shop that's touching it so we've got 
> "support" issues.

I had that same scenario at my previous employer. At the time nobody
wanted to pick up Java, so I went the RPG route (that's why I wrote
the XML parser wrappers and RPGMail on my site mowyourlawn.com). By
the time I got done getting everything working in RPG (because there
weren't any tools out there to do it) the doors for Java were much
more open.

There were comments in this thread from others that were more or less
stating "Go with a Service Oriented Architecture".  That is the way to
go if you must include both RPG and Java. Don't ever let your RPG
instantiate Java, but instead invoke a light weight Java web service
that is running in Tomcat on your iSeries (for example). Use
bvstools.com's GETURI or scottklement.com's HTTPAPI to invoke the web
service from RPG.

If you are introducing Java anyway I would sit down with your IT
manager and have a heart to heart about the direction of your
technology.  You can spin your wheels a long time using a hammer (RPG)
on a screw (XML).  I learned that the hard way :-(

HTH,
Aaron Bartell


On 5/19/05, Larry Ducie <Larry_Ducie@xxxxxxxxxxx> wrote:
> Hi Aaron, Paul, Joe Sam,
> 
> I'm quite wiling to write an all-java app. Unfortunately, I'm the only guy
> in our shop that's touching it so we've got "support" issues. The gusy are
> happy as long as the NEP is wrapped in RPG. (go figure!) So I am quite
> willing to rewrite as necessary.
> 
> Joe Sam,
> 
> Regarding my incompatible statements - The main program sits on a data queue
> and retrieves an XML path. It is bound to two service programs:
> 
> SV1 - this handles the transformation from XML to SQL statements via JNI
> calls. The result is placed in a Stream file. This returns the file path of
> the result file.
> 
> SV2 - this is SQLRPGLE and is passed the file path of the result file. It
> then reads the file line-by-line and executes the inserts via dynamic SQL.
> 
> I'm perfectly happy to convert to an all-java app (I have the time) but you
> may have to guide me a little.
> 
> The main thing is that the guys want the NEP to be running in the same
> subsystem as all of our other NEPS, it needs to be sitting on a data queue,
> and that's practically it.
> 
> Any code snippets using data queues and native JDBC would be nice - I can
> handle the other "java" stuff.
> 
> Also, how do I throw an exception back up to the wrapping Native app?
> 
> Your help in this would be extremely welcome.
> 
> TIA
> 
> Larry Ducie
> 
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