1. The implementation of some Hedge weights is not correct in some cases. There are no problems in dimension one if the underlying asset is a ConstantVolatilityAsset. More details and a description of the hedge weights in the file HedgeWeights.ps.
2. You might not agree with the way the return from trading according to a trading strategy is computed (file TradingStrategy.java). Scrutinize this.
3. Package RandomVariables: The implementation of the NegativeBinomialVariable is incorrect. The problem is almost certainly a confusion in the way the cern.jet.random.NegativeBinomial uses it's parameters.