Trouble With getting Applet to work with browser

Newbie & Debugging Questions
#1

Hello. I made a Pong game in Java and it works fine in appletviewer, but when ever I try to run it as a Applet in IE it just says it failed. I checked the console and I got this. Do you think it could be because I am using Image Icons.

java.security.AccessControlException: access denied (java.io.FilePermission sword.png read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at sun.awt.SunToolkit.getImageFromHash(Unknown Source)
at sun.awt.SunToolkit.getImage(Unknown Source)
at javax.swing.ImageIcon.(Unknown Source)
at javax.swing.ImageIcon.(Unknown Source)
at sprite.(sprite.java:16)
at pong.(pong.java:27)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

#2

show us the code you’re using to load ‘sword.png’ and we’ll tell you how to change it to make it work.

#3

Here is the pong code

import java.applet.Applet;
import java.awt.;
import java.awt.event.;
import java.util.Random;

public class pong extends Applet implements Runnable, KeyListener{

Thread thr = new Thread(this);

Image buffer;
int ya=89;
int yb=89;
int yc=105;
int xa=165;

int rightScore=0;
int leftScore=0;

int ycAdd=0;
char ballDir=‘c’;

boolean fps = true;
char dir = ‘r’;

Random num = new Random();

sprite sa = new sprite(“sword.png”,1);
sprite sb = new sprite(“sword.png”,1);
sprite ba= new sprite(“ball.png”,1);

public void init(){
addKeyListener(this);
setBackground(Color.black);
thr.start();
}

public void paint(Graphics g){

sa.pasteSprite(this,g,0,ya);
sb.pasteSprite(this,g,325,yb);
ba.pasteSprite(this,g,xa,yc);

g.setColor(Color.green);
g.drawString(“SCORE”,120,10);
g.drawString(""+leftScore+" // "+rightScore,125,30);

}

public void update(Graphics g){

if (buffer == null)
buffer=createImage(350,250);
Graphics ga= buffer.getGraphics();
ga.clearRect(0,0,350,250);
paint(ga);
g.drawImage(buffer,0,0,this);
ga.dispose();

}//END UPDATE METHOD

public void run(){
while(fps){

//AI CODE START HERE
if (yb>yc+20 && num.nextInt(2)==1)
yb=yb-8;
if (yb+72<yc && num.nextInt(2)==1)
yb=yb+8;
//AI CODE ENDS HERE

if (hit.spriteHitTest(sa,ba)){
dir=‘r’;
if (ballDir==‘u’)
ycAdd=num.nextInt(3)+2*-1;
if (ballDir==‘d’)
ycAdd=num.nextInt(3)+2;
}//ENF IF
else if (hit.spriteHitTest(sb,ba)){
dir=‘l’;
}//End ELSE IF

if (yc >=230)
ycAdd=-4;
else if (yc <= 0 )
ycAdd=4;

if (xa >=360){
ballDir=‘c’;
ycAdd=0;
yc=105;
xa=165;
leftScore=leftScore+1;
}else if (xa <= -30 ){
ballDir=‘c’;
ycAdd=0;
yc=105;
xa=165;
rightScore=rightScore+1;
}//END ELSE IF

if (dir == ‘r’)
xa=xa+4;
else if (dir == ‘l’)
xa=xa-4;

yc=yc+ycAdd;

try{thr.sleep(10);}catch(Exception e){}//SLEEP METHOD

repaint();
}//END WHILE LOOP

}//END RUN METHOD

public void keyPressed(KeyEvent e){
int codeNum= e.getKeyCode();

if (codeNum==e.VK_UP){

if (ya>0)
ya=ya-8;
ballDir=‘u’;

repaint();
}else if (codeNum==e.VK_DOWN){

if (ya<178)
ya=ya+8;
ballDir=‘d’;

repaint();
}//End IF

}//END METHOD

public void keyTyped(KeyEvent e){
int codeNum= e.getKeyCode();

}//END METHOD

public void keyReleased(KeyEvent e){
int codeNum=e.getKeyCode();

}//END METHOD

}//end class

--------Here is the sprite code-------

import javax.swing.;
import java.awt.;

public class sprite{

private ImageIcon[] frameSprite;
private int gx;
private int gy;
int currentFrame=0;
boolean _switch=true;

public sprite(String frame, int max){
frameSprite=new ImageIcon[max];
frameSprite[0]=new ImageIcon(frame);
gx=0;
gy=0;
}

public sprite(String[] frames){
frameSprite=new ImageIcon[frames.length];

for (int a=0; a<frames.length; a++)
frameSprite[a]=new ImageIcon(frames[a]);

gx=0;
gy=0;
}

public final void addFrame(String frame,int seg){
frameSprite[seg]=new ImageIcon(frame);
}

public final int returnSpriteX(){
return gx;
}

public final int returnSpriteY(){
return gy;
}

public final int returnSpriteWidth(int frame){
return frameSprite[frame].getIconWidth();
}

public final int returnSpriteHeight(int frame){
return frameSprite[frame].getIconHeight();
}

public final void pasteSprite(Component c,Graphics g,int x, int y,int frame){
frameSprite[frame].paintIcon(c,g,x,y);
gx=x;
gy=y;
currentFrame=frame;
}

public final void pasteSprite(Component c,Graphics g,int x, int y){
frameSprite[currentFrame].paintIcon(c,g,x,y);
gx=x;
gy=y;
}

}

#4

you should try holding a BufferedImage instead of an ImageIcon. Check out these options:


URL resource = sprite.class.getClassLoader().getResource(string);
BufferedImage image = ImageIO.read(resource);

However I’ve had some problems with ImageIO in Applets. You could also try:


Image src = Toolkit.getDefaultToolkit().createImage(resource);
MediaTracker mt = new MediaTracker(new Applet()); //or if you already have a Component somewhere, pass that in instead of a new Applet()
mt.addImage(src, 0);
try {mt.waitForAll();}
catch (InterruptedException e){
      e.printStackTrace();
}

The first method doesn’t return until the image is loaded. The Toolkit method starts the loading process but doesn’t necessarily finish for a little while later. To ensure it’s loaded immediately, you use the MediaTracker code afterwards to wait until it’s done.