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RE: [Swarm-Support] swarm


From: Ivan Lazarevic
Subject: RE: [Swarm-Support] swarm
Date: Tue, 6 May 2003 16:44:05 +0200

Maybe you didn't instantiate modelSchedule before calling its method?


Ivan Lazarevic

-----Original Message-----
From: address@hidden [mailto:address@hidden Behalf
Of Gregoire Boutonnet
Sent: Tuesday, May 06, 2003 4:05 PM
To: address@hidden
Subject: [Swarm-Support] swarm


Hi,

I program in java language.
I have read the tutorial and I try to make a programme but I have an error
that I can`t correct.

I explain my trouble :
I have a file "ModelSwarm.java" in which I have written the fonction
"activateIn(Swarm swarmContext)"

the code is :

 public Activity activateIn(Swarm swarmContext)
    {
        // Use the parent class to activate ourselves in the context passed to 
us
        super.activateIn(swarmContext);

        // Then activate the schedule in ourselves
        modelSchedule.activateIn(this);     // line 172 of ModelSwarm.java

        // Finally return the activity we have built
        return getActivity();

    }

Like in heatBugs

and in another file "StartSimulation.java" I call this method :
modelSwarm.activateIn(null); (line 31)
This request is in the main method.

When I compile I have no error
But when I want to run the program I have this error :

Exception in thread "main" java.lang.NullPointerException
        at ModelSwarm.activateIn(ModelSwarm.java:172)
        at StartSimulation.main(StartSimulation.java:31)

And I don`t understand why.
Maybe can you help me.

Thanks a lot
Regards

BOUTONNET Gregoire


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