Re: JVM and activation groups in OS/400

Larry,

I'd imagine that each activation group has it's own instance of a 
JVM...when you reclaim the activation group, all resources to that are 
freed up by the system...including JVMs...

Shane



Larry Gorlin <LGorlin@xxxxxxxxxxxxxxxxx> 
Sent by: java400-l-bounces@xxxxxxxxxxxx
08/03/2005 01:56 PM
Please respond to
Java Programming on and around the iSeries / AS400 
<java400-l@xxxxxxxxxxxx>


To
"java400-l@xxxxxxxxxxxx" <java400-l@xxxxxxxxxxxx>
cc

Subject
JVM and activation groups in OS/400






I seem to have an odd issue going on when accessing Java from RPG
programs within a single interactive job. 
 
Our company uses two activation groups (we'll call them ActivationGroup1
and ActivationGroup2).  All standard ILE RPG programs are compiled under
ActivationGroup1 and Service Programs are compiled under
ActivationGroup2.
 
We have a main menu program which regularly does a RCLACTGRP for each of
these two activation groups.
 
The problem is when accessing Java methods inside an RPG Program.  The
first time in, there's no issue.  The JVM creates itself and all methods
run fine.
 
The issue happens after the user returns to the menu and the RCLACTGRP's
are run.  When the user then returns to one of the procedures that call
java methods, the program crashes with a "Attempting to access a
destroyed object" message.  Occasionally, I've also seen the message
"The Java Virtual Machine has ended".
 
After some experimentation, it seems that the RCLACTGRP for the Service
Program activation group is the one that causes the problem.  If at any
time I do a RCLACTGRP ActivationGroup2, all attempts to access Java from
within my RPG will fail.
 
I don't see the link between the JVM and the activation group. 
 
Any ideas?
 
Thanks,
Larry (lgorlin@xxxxxxxxxxxxxxxxx)

_________________________________________________________

REMINDER:  IP User Conference Sept. 12-14!  Click here to register: 
https://www.Islandpacific.com/2005UserConference/register.asp

_________________________________________________________
        - ISLAND PACIFIC E-MAIL LEGAL DISCLAIMER -

  This email is covered by the disclaimer linked below.
          You are urged to read the disclaimer.
        <http://www.islandpacific.com/email.htm>
_________________________________________________________