RE: How to make some Java classes or jar as a service program ?

["Rooney, Michael P [CI]" <michael.p.rooney@xxxxxxxxxxxxx>]

Vengoal,

Any ILE program can invoke a java class.  I doubt there would
be a restriction if the "invocation" was done via a service
program or not.

While I'm not a java developer, I "view" JAR files similar to
service programs and DLL's in the windows arena.  That is, they
contain "packaged" call-able functions that I can reference to
compliment my HLL program.  That's what the JNI is (QSYS/QJVAJNI). 

That said, I cannot think of a technical reason why any service
program could not include or execute a JAR file or class.

If I were to develop a service program that utilized java, I would
probably mandate some practices with respect to managing the
activation/deactivation of the JVM.  As there may be issues with
respect to activation group and/or performance, it would probably
be better served to have the "caller" start and destroy the JVM.
Incorporating JVM management into the SVCPGM adds additional
performance overhead.

Lastly, there might be a "trivial" amount of overhead in using
a SVCPGM (based on design and call method), I would anticipate
calling java objects via RPGLE or SVCPGM's to be relativley the
same in performance.

Hope this helps.

Michael Rooney
Citigroup International                

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Vengoal Chang
Sent: Sunday, April 11, 2004 9:10 PM
To: 'RPG programming on the AS400 / iSeries'
Subject: How to make some Java classes or jar as a service program ?


Hi,
        How to make  some Java classes or jar as a service program ? The
RPGLE Program declare some O type java calss for use will start JVM. If
we call the service program which made by java program, will OS start
the JVM or not ? Does calling java service program performace is better
than direcly used Object in RPGLE program ?

Best regards,

Vengoal


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