A CICS COMMAREA is just a parameter between two programs. It is in the same
unit of work and transaction.
The Technology office persion is using the OO COBOL wrapper to make a class
that Java can call. He is having trouble finding the procedural COBOL
module in the PDS. I am suggesting that he might need to export the STEPLIB
environment variable before he calls Java. What do you think?
From: Denis Gaebler <[EMAIL PROTECTED]>
Reply-To: IBM Mainframe Discussion List <[email protected]>
To: [email protected]
Subject: Re: Java calls old COBOL
Date: Tue, 8 Aug 2006 09:54:11 -0400
I think there must be a distiction between calling a module and another
transaction. E.g. with IMS you can do a program to program switch from a
IMS Java tran to an IMS COBOL tran, but these are separate transactions
(Units of work). I don't know enough about CICS but I guess a COMMAREA call
will be another transaction instance and is not really calling a single
module with a Parameter List. You might have a wrapper that creates the
Parameter List from the COMMAREA to call the COBOL module.
The only way calling old COBOL from Java I know is using an OO COBOL or C
Wrapper (JNI) to stay within the UOW scope of the calling TCB. There are
other methods possible if there is a protocol in between (TCPIP Listener,
MQ, Java calls a DB2 Stored Proc that calls the Procedural COBOL). Most of
them are usable for small amounts of invokation, but do not scale. Only
some of them stay within the UOW of the caller, some to not even support
that. Most of them are a nightmare from the performance point of view
(Think of some applications having more than 100 modules).
For the other way around (COBOL calls Java), with some restrictions, Java
Objects can be instanciated and methods called/parameters passed from
procedural COBOL, I tried that with Enterprise COBOL for z/OS V3R4. Some of
the restrictions are Linked Module in a PDSE, XPLINK(ON), POSIX(ON) to name
the most significant.
Denis.
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