The specification of this method is 
     public void defaultCrossover(EvolutionState state, int thread, VectorIndividual ind)

But, woudln't be better if it was:
     public void defaultCrossover(EvolutionState state, int thread, VectorIndividual ind1, VectorIndividual ind2)

Because, the crossover is among two individuals of the population.

In my particular case I have to crossover two individuals of gene vector, but the method only have 1.

Any suggestion?