notimplementedexception

I am using Apache POI API to getting values from an Excel file. Everything is working great except with cells containing formulas. In fact, the cell.getStringCellValue() is returning the formula used in the cell and not the value of the cell. I tried to use evaluateFormulaCell() method but it's not working because I am using GETPIVOTDATA Excel formula and this formula is not implemented in the API: Exception in thread "main" org.apache.poi.ss.formula.eval.NotImplementedException: Error evaluating cell Landscape!K11 at org.apache.poi.ss.formula.WorkbookEvaluator.addExceptionInfo

This really, really urks me, so I hope that someone can give me a reasonable justification for why things are as they are. NotImplementedException. You are pulling my leg, right? No, I'm not going to take the cheap stab at this by saying, "hang on, the method is implemented - it throws a NotImplementedException." Yes, that's right, you have to implement the method to throw a NotImplementedException (unlike a pure virtual function call in C++ - now that makes sense!). While that's pretty damn funny, there is a more serious problem in my mind. I just wonder, in the presence of the