RE: Can the JVM be restarted?

["Wills, Mike N. (TC)" <MNWills@xxxxxxxxxxxxxx>]

Sooooo, if the job ends, the JVM ends. Okay... Well, I don't know what was
going on, but all the sudden it worked after running the DMPJVM command I
found.


Mike Wills
Lawson Programmer/Administrator
Taylor Development
Email: mnwills@xxxxxxxxxxxxxx
Direct Line: (507) 386-3187

-----Original Message-----
From: Barbara Morris [mailto:bmorris@xxxxxxxxxx] 
Sent: Friday, December 12, 2003 2:54 PM
To: java400-l@xxxxxxxxxxxx
Subject: Re: Can the JVM be restarted?

Mike Silvers wrote:
> 
> As far as the JVM, it can not be "restarted".  When an RPG program 
> interfaces with a Java program, an instance of the JVM is used.  This 
> process, as well as the same instance, is used until either the RPG 
> program exits or the programmer uses an API to end the instance.  Once 
> the instance is ended within a single RPG program, it can not be 
> started and/or opened again.  The "weird errors" would be hard to 
> troubleshoot without more information...
> 

The JVM doesn't end with the RPG program.  On V5R1, where you can end the
JVM with the destroyJVM API, you could end the JVM in an RPG program, and
then start another one in the same program.  Or you could end your first
program (LR or not, makes no difference), and call another program to use
the same JVM.

One exception: on V5R1, ending an activation group ends the JVM, so if your
program is a *NEW AG program, the JVM does end when the program ends.

On V5R2, ending an AG doesn't end the JVM; you have one JVM for the lifetime
of your job.

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