BOBYQA Optimization - Passing Coefficient Arrays For Objective Function

[rsloma]

I could use some help with this issue.  I am not an expert with Java
programming. Maybe this should be obvious, so excuse me if this is trivial.

I have the code working to pass the starting point array to the class
implementing MultivariateFunction.  An example of the class code I am
working with is below.  I am trying to pass the coefficient ThreeYrRet
arraylist, but when I attempt to add the arraylist to public double
value(...., I get the message that the class *Portfolio is not abstract and
does not override abstract method value(double[]) in
org.apache.commons.math3.analysis.MultivariateFunction*.  Making the class
abstract does not work, as well as implementing abstract methods.

Your help on this is greatly appreciated.

    public static class Portfolio implements MultivariateFunction  {
              
        @Override
        public double value(double[] x) {
            

        double Rp = 0;
        double RFR = 0.0007;
        

            for (int i = 0; i < x.length; ++i) {
            Rp += x[i] * ThreeYrRet.get(i).get(0);


            }
            
            
        double f = (Rp - RFR);
        
        System.out.println("weights = " + x);
        System.out.println("f = " + f);
        return f;
        }
        }

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