Receiving a null pointer exception when trying to use toString

Question

I am trying to access a local database and pull the data out and store it in an array...but I keep receiving a null pointer exception, please help?

int rows = 0;
int colNum = res.getMetaData().getColumnCount();
res.beforeFirst();

while(res.next()){
    rows++;
    for(int i = 1; i < colNum; i++){
        teamTable[rows - 1][colNum - 1] = res.getString("Team");
        teamTable[rows - 1][colNum - 1] = res.getInt("Goal Difference");
        teamTable[rows - 1][colNum - 1] = res.getInt("Points");
        System.out.println(teamTable[rows - 1][colNum - 1]);
    }
}

Answer 1

My bet is that you haven't initialized the teamTable multidimensional array properly. Does it have enough rows? Have you called teamTable[rowIndex] = new Object[colNum];? If you forgot about the second one, or teamTable is just null, then you get a NullPointerException.

If this isn't clear, then read a tutorial about Java multidimensional arrays, e.g. the answers for this question: Syntax for creating a two-dimensional array