исключение в потоке main java .lang.nullpointerexception

Question

Как я могу это исправить?:

exception in thread main java.lang.nullpointerexception
at KMeans$Builder.<init>
at KMeans.main<KMeans.java>

Я пытался использовать @notnull, но он не работал Код:

public static class Builder {
     private final int k;
     private final double[][] points;
      private int iterations     = 10;
      private boolean pp         = true;
      private double epsilon     = .001;
      private boolean useEpsilon = true;
      private boolean L1norm = true;

      public Builder(int k, double[][] points) {
         if (k > points.length)
            throw new IllegalArgumentException("Required: # of points >= # of clusters");
         HashSet<double[]> hashSet = new HashSet<double[]>(k);
         int distinct = 0; }