[JAVA] Exception in thread "main" java.lang.NullPointerException

[I_love_Italy]

Salve a tutti,
nella classe che ho creato mi compare il seguente errore:

Exception in thread "main" java.lang.NullPointerException
at synthetic.binary.SintheticBinarySpectrum.main(Sint heticBinarySpectrum.java:43)

dove al classe incriminata è:

import tools.exception.Exception;
import tools.numeric.interpolation.*;

public class SpectrumInterpolation 
{
	private double [] totalflux;
	private double[] lambda;
        private double[] flux1;
        private double[] flux2;
        private double shift; 
    
	
	public SpectrumInterpolation (double[]l, double []f1, double []f2, double s) 
    {    	
    	lambda=l;
    	flux1=f1;
    	flux2=f2;
    	shift=s;
    }	
   public void Interpolation () 	throws Exception
   {	
    	totalflux = new double[lambda.length];
    	double step;
    	double points;  	
    	double [] newlambda = new double[lambda.length];
    	double [] newflux2  = new double[lambda.length];
    	
    	
    	    	
    	for( int i=0; i<lambda.length ; i++) 
    	{
    		newlambda[i] = lambda[i] + shift; 
    	}
    
    	step=lambda[2]-lambda[1];
    	points=shift/step;
    	           	       
    	//Interpolation
    	Interpolator f = new LinearInterpolator();
    	f.setSample(lambda,flux2);
       
    	if (shift>0)
    	{
    		for (int i=0; i<lambda.length-points-1; i++) 
    			//controllare per shift negativo
    		{
        		newflux2[i] = f.getValue(newlambda[i]); 
          	}
    	}
    	
        //correzione punti inadatti         
    	if (shift<0) 
    	{ 
    	for(int j=0;j<points;j++)
    		   {
				  newflux2[j] = 0 ;
				  flux1[j]=0;
				}
	     }       
    	else 
    	{ 
    		for(int j=lambda.length-(int)points; j<lambda.length; j++)
    	      {
    		    newflux2[j] = 0;
    		    flux1[j]=0;
    		  } 
    	}
     
    	 //somma flussi
	     for (int i=0 ; i<lambda.length; i++)
         {
	    	totalflux[i]= flux1 [i] + newflux2[i];
	    	System.out.println (newflux2[i]);
          }
  
     }
	    
	    public double[] getSum()
    	{
		 return totalflux;
    	}

}

mentre la classe col main è questa:

import tools.exception.Exception;
import java.io.File;

public class SintheticBinarySpectrum {

	static StarArgs StarMain = new StarArgs();
	static StarArgs StarSecondary = new StarArgs();

	public static void main(String[] args) throws Exception {

		File file = new File("/lte100-3.5-0.0.spec");
		ReadNextGenFile results = new ReadNextGenFile(file);
		StarMain.Teff = results.getTeff();
		StarMain.logg = results.getlogg();
		StarMain.Met = results.getMet();
		StarMain.Spectrum.lambda = results.getLambda();
		StarMain.Spectrum.flux = results.getFlux();

		File file2 = new File("/lte100-2.0-0.0.spec");
		ReadNextGenFile results2 = new ReadNextGenFile(file2);
		StarSecondary.Teff = results2.getTeff();
		StarSecondary.logg = results2.getlogg();
		StarSecondary.Met = results2.getMet();
		StarSecondary.Spectrum.lambda = results2.getLambda();
		StarSecondary.Spectrum.flux = results2.getFlux();

		StarMain = StarData.setPar(0.8, 1.e8);
		StarSecondary = StarData.setPar(1.8, 1.e8);

		SpectrumInterpolation Interpolation = new SpectrumInterpolation(
				StarMain.Spectrum.lambda, StarSecondary.Spectrum.flux,
				StarMain.Spectrum.flux, 5.5);

		for (int i = 0; i <= StarMain.Spectrum.lambda.length - 1; i++) {
			System.out.println("Total flux (" + i + ")= "+ Interpolation.getSum()[i]);
		}

	}
}

l'errore compare in quest'ultimo ciclo for quando invoco getSum().

Chi mi sa dire dove sbaglio?