Thanks, Allan.
Back in the 90's I used CEEPIPI to create a persistent C enclave I could call
from Assembler because building the environment is expensive. Unfortunately,
CEEPIPI documentation is kind of scarce. What we do find doesn't give us very
many clues for how to get to Java.
Robert Crawford
Abstract Evolutions LLC
(210) 913-3822
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
allan winston
Sent: Tuesday, July 11, 2023 5:22 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: [EXT] Re: Invoke Java from Assembler
Robert,
This reminds me of a situation I ran into 25 years ago involving assembler
and COBOL. Granted, COBOL and Java are different environments, but there may
be enough similarity in the issues to be relevant.
We had an assembler main program that called a COBOL subroutine repeatedly.
It was chugging along just fine until LE maintenance showed a large spike in
CPU time within LE library routines, as shown by Strobe.
It seemed as though the LE environment was constantly being created and torn
down. I did look into solutions, such as using CEEPIPI, but this program was a
major CPU consumer in this shop and we needed a quick solution. The solution I
proposed and was implemented was to create a new main program, written in
COBOL, that called the former assembler main program. That way the new main
program established the LE environment that persisted until the program
terminated.
So, ALC calling COBOL changed to COBOL calling ALC calling COBOL.
In your case: Java calling COBOL changed to COBOL calling Java calling COBOL.
I have never used Java, so this is somewhat a shot in the dark.
I should have created an ETR on IBMLINK about the increased CPU overhead,
but did not bother since we had a circumvention.
Allan
On Tue, Jul 11, 2023 at 5:58 PM Crawford Robert C (Contractor) <
000004e08f385650-dmarc-requ...@listserv.ua.edu> wrote:
> We're interested in invoking Java from assembler in batch.
> Specifically, we'd like to create a persistent Java environment we can
> call repeatedly and terminate when we're through.
>
> Has anyone done this? Is the LE pre-initialization module CEEPIPI
> worth exploring?
>
> Thanks.
>
> Robert Crawford
> Abstract Evolutions LLC
> (210) 913-3822
>
>
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