KnapSack problem on grid!

Hello JGAP users/admin, I have semestrial project on parallel computing and I must make parallel genetic algorithm to solve KnapSack problem. I'm trying to use JGAP to create grid. In examples there is KnapSack problem and grid example. My question is how to combine two examples to one working grid solution? I use Fitness function from KnapSack example for Fitness function in my GridConfiguration class and configure grid in GridConfiguration like that (This is for GridClient - I start grid server and worker before that. All classes are just like in grid example for evolution distributed only Fitness and Config classes are modified):

..........
public class KSEvoConfig extends GridConfigurationBase{
       
        public double a_knapsackVolume = 10000d;
        public final static double[] itemVolumes = {
              50.2d, 14.8d, 27.5d, 6800.0d, 25.0d, 4.75d, 95.36d, 1500.7d, 18365.9d,
              83571.1d};
        public final static String[] itemNames = {
              "Monitor", "Fruit", "Radio", " Big TV", "Gameboy", "Small object",
              "Medium object", "Big object", "Huge object", "Gigantic object"};

       
        public KSEvoConfig() {
            super();
          }

          public void initialize(GridNodeClientConfig a_gridconfig)
              throws Exception {
           
            if (a_gridconfig != null) {
              a_gridconfig.setSessionName("GRID_evolution_distributed");
            }
            Configuration ksconfig = new DefaultConfiguration();
                ksconfig.setEventManager(new EventManager());
               
                ksconfig.setPreservFittestIndividual(true);
                ksconfig.setFitnessFunction(new KSEvoFitnessFunction   a_knapsackVolume));
               
                Gene[] sampleGenes = new Gene[itemVolumes.length];
            for (int i = 0; i < itemVolumes.length; i++) {
              sampleGenes[i] = new IntegerGene(ksconfig, 0,
                                               (int) Math.ceil(a_knapsackVolume /
                  itemVolumes[i]));
            }
            IChromosome sampleChromosome = new Chromosome(ksconfig, sampleGenes);
            ksconfig.setSampleChromosome(sampleChromosome);
           
            ksconfig.setPopulationSize(100);
           
           
            setWorkerReturnStrategy(new EvoWorkerReturnStrategy());
           
            setGenotypeInitializer(new EvoGenotypeInitial());
           
            setWorkerEvolveStrategy(new KSEvoStrategy());
           
            setRequestSplitStrategy(new EvoRequestSplitStrategy(ksconfig));
            setConfiguration(ksconfig);
           
            setClientEvolveStrategy(new EvoClientEvolveStrategy());
           
          }........ etc.

With this setup the grid (Client!) don't work at all. Client conects and login properly, but then - Exception:

java.lang.NullPointerException
        at org.jgap.distr.grid.JGAPClient.evolve(JGAPClient.java:163)
        at org.jgap.distr.grid.JGAPClient.run(JGAPClient.java:101)

Thanking you in adavnce for any help!

 

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