Java NullPointerException after reading from database

Asked May 11 '17 at 05:32

Active May 11 '17 at 05:35

Viewed 19 times

This code throws me a NullPointerException

int StrtYr = getYear(timeToDate(0));
int YrDiff = 0;
int Pyr = 0;
List <Tuple> FP_entry = selectFrom(dummy_prices).list();
for (Tuple row : FP_entry){
    Pyr = row.get(dummy_prices.year);
    YrDiff = Pyr - StrtYr;
    if (YrDiff >= 0) {
        create_FPrice_tm(YrDiff, row.get(dummy_prices.price));
        }
    }

"dummy_prices" is a database table that contains two fields (int year, double price)

"FPrice_tm" is an instance of a dynamic event. it's defined for the simulation model.

edited May 11 '17 at 05:35

asked May 11 '17 at 05:32

E. Aly

Debug the code and see what is null and put check accordingly. – 2787184 May 11 '17 at 05:33
My guess is that `FP_entry` is coming back `null` and then you're trying to iterate it. – Tim Biegeleisen May 11 '17 at 05:34
but why would FP_entry come back null? – E. Aly May 11 '17 at 05:38

Java NullPointerException after reading from database

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