I got createWriter(); and createReader();  in a .pde. the wirter works but it dont Reade the date from the txt.

What im doing wrong?

Here my code:

float distanz;
PrintWriter output;
BufferedReader reader;
String line;



void setup (){
  size(500,500);
  smooth();
  output = createWriter("positions.txt"); 
  reader = createReader("positions.txt");
 }

void draw (){ 
 
   if (mousePressed && (mouseButton == LEFT)) {
   ellipse(mouseX,mouseY,50,50);
   point(mouseX, mouseY);  
   output.print(mouseX + "  " + mouseY+"  ");
   output.flush();
   }  


try {
    String line;
    while ((line = reader.readLine()) != null) {
    String[] pieces = split(line, TAB);
    int x = int(pieces[0]);
    int y = int(pieces[1]);
    ellipse(x, y, 50, 50);
    }
}
catch (Exception e) {
e.printStackTrace(); 
}
}