final SimpleQuote spot = new SimpleQuote(0.0);
final YieldTermStructure qTS = Utilities.flatRate(today, q, dc);
final YieldTermStructure rTS = Utilities.flatRate(today, r, dc);
final BlackVolTermStructure volTS = Utilities.flatVol(today, sigma, dc);
final GeneralizedBlackScholesProcess stochProcess = new GeneralizedBlackScholesProcess(
new Handle<Quote>(spot),
new Handle<YieldTermStructure>(qTS),
new Handle<YieldTermStructure>(rTS),