Simple Maze Game Problem

Processing Coding Questions
5 
class Ball {
  float x;
  float y; 
  float n;
  float m;
  float b= width-800;  
  float c = height-800;
  PImage img1;
  color colorFromMousePosition = get(mouseX, mouseY); 
  //float a;


  Ball () {
    float n = constrain (b, width, width-800);                  
    float m = constrain (c, height, height-800);            
    x = random(n);
    y = random (m);
  }

  void display() {

    if (mousePressed==false) {
      noStroke();
      fill (230, 0, 0);
      ellipse (x, y, 12, 12);
    } else {
      noStroke();
      fill (230, 0, 0);
      ellipse (mouseX, mouseY, 12, 12);
    }
  }
  void boundary () {
    if (brightness(colorFromMousePosition) == 255) {
      ellipse (mouseX, mouseY, 12, 12);
    } else {
      ellipse (x-1,y-1,12,12);
    }
  }
}

This time I post only the Class ball. I hvae a problem, in the variables of the class I put " color colorFromMousePosition = get(mouseX, mouseY); " and then in the function I creat a void boundary but if I run the code is shown the “NullPointerException”……… Also in the last else I don’t think so the x and y of the elllipse are good to stop the movement… Have you got any other input?? I’m stuck

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