Hello!
I have some code in Processing, when I press "Play" everything works like it should, but when I try to export an applet or application it shows white screen and nothing more. Do you know how to solve such a problem?
Here is the code:

void setup() {
  size(1200, 600, P2D);
  frameRate(30);
  background(255, 248, 236);
  castle = loadImage("castle.gif");
  //img = loadImage("cannon.png");
  //image(img, 5, height - img.height);
  rectMode(CORNER);
  ellipseMode(CENTER);
  PFont font;
  font = loadFont("a.vlw");
  textFont(font);
  fill(0);
  stroke(0);
  line(185 + 70 * 5, 0, 185 + 70 * 5, 40);
  image(castle, 560, height - 100);
  rect(560, height - 5, 80, 5);
  text(castleLife, 575, 500);
  ellipse(0, height, 16, 16);
}
//PImage img;
PImage castle;
float castleLife = 15;
int lowT = 650;
int highT = 740;
int g = 0;
int d =0;
int force = 0;
float angle = 90.0;
int hits = 0;
void draw() {




  fill(0);
  stroke(0);
  //image(img, 5, height - img.height);

  float x = mouseX;
  float y = height - mouseY;
  angle = (y / (x + y)) * 90;
  writeDegree(angle);
  if (mousePressed) {
    fill(0);
    stroke(0);
    rect(185, 0, force * 5, 40);
    force += 1;
    if (force >= 71) {
      force = 0;
      fill(255, 248, 236);
      stroke(255, 248, 236);
      rect(185, 0, 349, 40);
    }
  }
  else
  {
    force = 0 ;
    fill(255, 248, 236);
    stroke(255, 248, 236);
    rect(185, 0, 150, 40);
  }
}
void writeDegree(float deg) {
  fill(255, 248, 236);
  stroke(255, 248, 236);
  rect(0, 0, 185, 50);
  fill(0);
  String f = str(deg);
  text(f, 0, 40);
}
boolean finished = false;


float degfrad(float deg) {
  return deg / 180 * PI;
}
void mouseReleased() {

  hits += 1;
  float attackSpeed;
  fill(255, 248, 236);
  stroke(255, 248, 236);
  rect(0, 0, width, height);
  fill(0);
  stroke(0);
  line(185 + 70 * 5, 0, 185 + 70 * 5, 40);
  image(castle, 560, height - 100);
  rect(560, height - 5, 80, 5);
  int xa = 30;
  int ya = 100;
  float f = force;
  force = 0;
  float a = angle;
  int times = 0;
  rect(120, 0, 150, 20);
  float A = 1000.0;
  float speed = f / 40;
  float g = 0.981;
  float t = 0.0;
  float x = 0.0;
  float y = 0.0;
  float forceX = speed * cos(degfrad(a));
  float forceY = speed * sin(degfrad(a));
  colorMode(HSB);
  float h;
  int l;
  boolean bye = false;
  while (true) {
    t+= 0.00001;
    x += forceX;
    y += forceY;
    forceY -= (g * t);
    h = forceY;
    if (forceY < 0) {
      h = -forceY;
    }
    l = int(255-180-((forceX + h) * 25));
    if (l < 0) {
      fill(0, 0, 0);
      stroke(0, 0, 0);
    }
    else {
      fill(l, 240, 127);
      stroke(l, 240, 127);
    }

    ellipse(x, height - y, 4, 4);


    if (2*forceY <= g * t) {
      times = int(t * 100000);
      break;
    }
  }
  for (int d =0;d<=times;d += 1) {
    t+= 0.00001;
    x += forceX;
    y += forceY;
    forceY -= (g * t);
    h = forceY;
    if (forceY < 0) {
      h = -forceY;
    }
    l = int(255-180-((forceX + h) * 25));
    if (l < 0) {
      fill(0, 0, 0);
      stroke(0, 0, 0);
    }
    else {
      fill(l, 240, 127);
      stroke(l, 240, 127);
    }
    ellipse(x, height - y, 4, 4);
  }
  colorMode(RGB);
  attackSpeed = h + forceX;

  fill(0);
  stroke(0);


  forceX = 0;
  if (int(x)>=lowT&&int(x)<=highT) {
    text("COOL! - distance: " + x + ", force - "+ f/70*100 + " %, " + angle + " degrees, attack speed : " + attackSpeed, 20, 80);
    fill(255, 248, 236);
    stroke(255, 248, 236);
    castleLife -= attackSpeed;
    rect(560, 465, 80, 35);
    fill(0);
    stroke(0);
    if (castleLife <= 0) {
      PFont winFont = loadFont("b.vlw");
      textFont(winFont);
      text("Great! You passed the game by "+ hits + " hits!", 20, 200);
      winFont = loadFont("a.vlw");
      textFont(winFont);
      text("(Press Esc to exit)", 550, 300);
    }
  }
  else {
    text("Try Again! - distance: " + x + ", force - "+ f/70*100 + " %, " + angle + " degrees, attack speed : " + attackSpeed, 0, 80);
  }

  text(castleLife, 575, 500);
}

Thank you in advance!