Java execution problem

[david ROBIN]

Hi ,I am a french student user of swarm in Java under
NT, and i got a strange execution problem:
my program runs sometimes perfectly when i start it by
doing "javaswarm myProgramName --varyseed"

and sometimes it crashes and i got the following
error:
"internal error
Please check your CLASSPATH and your installation.
Exception throw was of type
'java/lang/NullPointerException'
NULL message"

and i am sure that my installation is correct, because
jheatbugs and jmousetrap and my other programs works
perfectly.

I found it came from a list problem
sketch of code:
 ListeAgent= new ListImpl (getZone ());
      ListeClient= new ListImpl (getZone ());
      ListeRapporteur= new ListImpl (getZone ());
      //i fill the lists

      for (i=0;i<nbPersonne ;i++)
       {


        Agent unAgent;

        unAgent=new Agent();
        unAgent.ResetTabnote();
        ListeAgent.addLast(unAgent);
        }

        for (i=0;i<nbPersonne;i++)
        {
          int j;
         
j=Globals.env.uniformIntRand.getIntegerWithMin$withMax(0,nbmaxProfil-1);
          Client unClient;
          unClient=new Client();
          unClient.setProb  (PProb,DProb,RProb,AProb);
                unClient.setProfil(j);
          ListeClient.addLast(unClient);
        }

         for (i=0;i<nbPersonne;i++)
        {
          Rapporteur unRapporteur;
          unRapporteur=new Rapporteur();
          ListeRapporteur.addLast(unRapporteur);
        }
        for (i=0;i<nbPersonne;i++)//i associate  an
agent to a client and a rapporteur to a
couple(client,agent)
        {
          Agent unAgent;
          Client unClient;
          Rapporteur unRapporteur;
          unAgent=(Agent)ListeAgent.removeFirst();
          unClient=(Client)ListeClient.removeFirst();
          unRapporteur=(Rapporteur) 
ListeRapporteur.removeFirst();
          unClient.setAgent(unAgent);
          unRapporteur.setAgent(unAgent);
          unRapporteur.setClient(unClient);
          ListeAgent.addLast(unAgent);
          ListeClient.addLast(unClient);
          ListeRapporteur.addLast(unRapporteur);
        }

And when i set the number of clients(=number of
agents=number of rapporteurs) to 1, it always runs
properly but the greater the number is the more it
crashes...

Thanks for helping me to resolva this problem
David


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