Re: JVM and activation groups in OS/400

    I'm in agreement with Shane.  Java is not an ILE language or
participant.


                                                         Joe Sam

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----- Original Message ----- 
From: <Shane_Cessna@xxxxxxx>
To: "Java Programming on and around the iSeries / AS400"
<java400-l@xxxxxxxxxxxx>
Sent: Wednesday, August 03, 2005 3:17 PM
Subject: 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)
>