Thread: Strings in switch are not supported in source 1.5...

I am creating a checkers game and im trying to paint the board but it says the switch is using a string, but its actually not. Here is the code

public void paintComponent(Graphics g) {


for (int row = 0; row < 8; row++) {
for (int col = 0; col < 8; col++) {
if ( row % 2 == col % 2 )
g.setColor(Color.LIGHT_GRAY);
else
g.setColor(Color.GRAY);
g.fillRect(2 + col*20, 2 + row*20, 20, 20);
switch (board.pieceAt(row,col)) {
case CheckersData.RED:
g.setColor(Color.RED);
g.fillOval(4 + col*20, 4 + row*20, 15, 15);
break;
}
}

And this is the method it calls

int pieceAt(int row, int col) {
return board[row][col];
}

Any help would be much appreciated.