Deploying LWJGL applet problems

Newbie & Debugging Questions
#1

Hi, I’m trying to deploy my java game as an applet and the screen just says the following:

‘Permissions for Applet refused.
Please accept the permissions dialog to allow
the applet to continue the loading process.’

I’m receiving the following errors in the java console:

[quote]This occurred while ‘Determining packages to load’
access denied (“java.util.PropertyPermission” “deployment.user.cachedir” “read”)
java.security.AccessControlException: access denied (“java.util.PropertyPermission” “deployment.user.cachedir” “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.checkPropertyAccess(Unknown Source)
at java.lang.System.getProperty(Unknown Source)
at org.lwjgl.util.applet.AppletLoader.getLWJGLCacheDir(AppletLoader.java:1064)
at org.lwjgl.util.applet.AppletLoader$3.run(AppletLoader.java:1050)
at org.lwjgl.util.applet.AppletLoader$3.run(AppletLoader.java:1038)
at java.security.AccessController.doPrivileged(Native Method)
at org.lwjgl.util.applet.AppletLoader.getCacheDirectory(AppletLoader.java:1038)
at org.lwjgl.util.applet.AppletLoader.run(AppletLoader.java:843)
at java.lang.Thread.run(Unknown Source)
[/quote]
My html file looks like this:

[quote]

[/quote] Any help on what to do would be much appreciated as I'm new to lwjgl applets etc.
#2

You included the wrong jars. LWJGL provides signed jars for applets. It’s called “lwjgl_applet-.zip” and they are under the “basic” folder.

#3

Thankyou, this has gotten rid of those errors, but now it’s still not working, but I think it has something to do with my class and appletgamecontainer, can I still have AppGameContainer in my main class or do I need to change it, since some tutorials weren’t saying to change it?

Console:

[quote]Thu Oct 11 22:07:12 BST 2012 ERROR:javagame.Game
java.lang.InstantiationException: javagame.Game
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.newdawn.slick.AppletGameContainer.init(AppletGameContainer.java:124)
at org.lwjgl.util.applet.AppletLoader.switchApplet(AppletLoader.java:1326)
at org.lwjgl.util.applet.AppletLoader$2.run(AppletLoader.java:909)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
This occurred while ‘Initializing real applet’
Unable to create game container
java.lang.RuntimeException: Unable to create game container
at org.newdawn.slick.AppletGameContainer.init(AppletGameContainer.java:148)
at org.lwjgl.util.applet.AppletLoader.switchApplet(AppletLoader.java:1326)
at org.lwjgl.util.applet.AppletLoader$2.run(AppletLoader.java:909)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
[/quote]
Also my main class:

package javagame;

import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
/**
 * To-Do List:
 * 
 * Add life losses
 * Add disappearing target timing
 * Add more upgrades
 * Add more levels
 * Add different difficulties
 * Have better drawn graphics
 * Implement working sound
 */
public class Game extends StateBasedGame{
 
	public static final int menu = 0;
	public static final int level1 = 1;
	public static final int shop = 2;
	public static final int gameOver = 3;
	
	public static final String gamename = "Shooting";
	public static int ammo = 5;
	public static int maxlives = 3;
	public static boolean autoreload = false;
	public static String chosensight = "res/sights/sight1.png";
	public static int hiscore1=100;
	public static int hiscore2=75;
	public static int hiscore3=50;
	public static int hhiscore1=100;
	public static int hhiscore2=75;
	public static int hhiscore3=50;
	
	public static int level = 1;
	
	public static int sight2unlock = 0;
	public static int sight3unlock = 0;
	public static int sight4unlock = 0;
	public static int sight5unlock = 0;
	
 
	public Game (String gamename){
		super(gamename);
		this.addState(new Menu(menu));
		this.addState(new Level1(level1));
		this.addState(new Shop(shop));
		this.addState(new GameOver(gameOver));
		
	}
 
	public void initStatesList(GameContainer gc) throws SlickException {
		this.getState(menu).init(gc, this);
		this.getState(level1).init(gc, this);
		this.getState(shop).init(gc,  this);
		this.getState(gameOver).init(gc,  this);
		
		this.enterState(menu);
		
		
	}
 
	
	public static void main(String[] args) throws SlickException {
		try 
	    { 
	      AppGameContainer app = new AppGameContainer( new Game(gamename) );
	      app.setDisplayMode( 800, 600, false );
	      app.start(); 
	    } 
	    catch ( SlickException e ) 
	    { 
	      e.printStackTrace(); 
	    } 
		
		
		
	}
}
#4

Make sure your javagame.Game class doesn’t use any parameters in its constructor method (i.e. it should be in the format “public Game()” ), otherwise Slick’s AppletGameContainer can’t create a new instance of it.

So get rid of “String gamename”, you can just hard code it inside the Game contructor method if you want to set a gamename instead of passing one to it.

#5

Thanks! It’s now loading, except it can’t get access to my resources, hopefully I can figure this out myself…

Start of console:
Thu Oct 11 22:30:13 BST 2012 ERROR:access denied (“java.io.FilePermission” “.\res\title.png” “read”)
java.security.AccessControlException: access denied (“java.io.FilePermission” “.\res\title.png” “read”)

#6

You can’t use File to access resources from inside jar files (since they are not on the file system anymore but inside a zip file). So you need to use an InputStream to access them.

#7

I just put my resources folder inside the jar and it’s working fine now, I’ll probably use InputStream as it’ll save hassle/problems in the future, but for now I’m going to bed since I’ve got school tomorrow:( Thanks for all the help!