Re: Calling Java from RPG/COBOL

To throw out one more idea, have you thought about using some sort of
program-to-program data passing instead of a direct call?  For example, use
a data queue, a user space, or a data area.  Take data queues.  The Java
program becomes a daemon job waiting for work by listening to the queue.
When the RPG/COBOL program has work, it puts an entry on the queue then
waits for a reply.  Maybe the worst consideration with this setup is
managing the Java daemon process.  How do you start it, how do you know if
it is still active, what authority does it have, etc.  On the other hand, a
benefit is you can move your Java app to a different machine if you ever
need to distribute the work.  Toolbox has a DataQueue object that lets you
access a queue on the same or a remote box.

David Wall
Toolbox for Java
iSeries ODBC Driver for Linux




                      "Jon Paris"
                      <Jon.Paris@Partne        To:       
<java400-l@midrange.com>
                      r400.com>                cc:
                      Sent by:                 Subject:  Calling Java from 
RPG/COBOL
                      java400-l-admin@m
                      idrange.com


                      05/29/2002 05:16
                      PM
                      Please respond to
                      java400-l





I'd like to hear from those of you with more "real world" experience than
me
of the pros and cons of different methods of invoking a Java app from RPG
and/or COBOL.  One specific item that I'm interested in is parameter
passing - and returning results from the Java code.  I've used the new RPG
method call support and am aware of the pitfalls there, but that is not
applicable to COBOL and JNI is just to darned ugly to want to consider
unless the alternative is a lobotomy!

Jon Paris
Partner400


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