[Swarm-Support] NullPointerException

[Min San T. Co]

Forget my previous posting.  I found where the problem lies.  I should
have named the file as SimpleSchool.scm instead of .sce.  I guess I should
be careful with the typos in the tutorial.



On Tue, 25 Mar 2003, Min San T. Co wrote:

> Hi!
>
> I am following Charles Staelin's java swarm tutorial while building my own
> model.  So far my model works upto SimpleSwarmBug2 (SimpleSwarmSchool2 in
> my case since I am modelling the educational system).  However, I get:
>
> Exception in thread "main" java.lang.NullPointerException
>         at StartSimpleSchool.main(StartSimpleSchool.java:35)
>
> when I create my SimpleSwarmSchool3.  I am able to execute SimpleSwarmBug3
> without problems.  But I have no idea why my SimpleSwarmSchool3 won't
> work.
>
> I am working in a linux environment.
>
> It seems that when I have
>
>  modelSwarm = new ModelSwarm(Globals.env.globalZone);
>
> in my StartSimpleSchool.java, my program works perfectly.  But when I use:
>
> modelSwarm =
>         (ModelSwarm)Globals.env.lispAppArchiver.getWithZone$key(
>                             Globals.env.globalZone, "modelSwarm");
>
> and include a SimpleSchool.scm file, where I list down all the parameters
> and values that I need to set in my ModelSwarm class, I get an exception.
>
> I'll appreciate any replies and suggestions...
>
> min
>
>
>
>
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