Slick2D applet blank screen + no errors.

Newbie & Debugging Questions
#1

I’ve been trying to figure out how to make an applet with Slick2D and I just can’t seem to get it to work. I made a Main class and a Game class which extends BasicGame. The “game” runs perfectly on Eclipse, but when I compile it and launch it on a browser, it loads the content and shows a blank page after.

I posted the applet on my site as well as the FULL src to the project. Any help would be appreciated!

Applet: http://ghostid.net/games/applet_test/
Source: http://ghostid.net/external/downloads/Applet_TEST.zip

Here’s all my code…

Main Class:


public class Main {
	public static void main(String[] args) {
		try {
			AppGameContainer game = new AppGameContainer(new Game("Test"));
			game.setDisplayMode(350, 250, false);
			game.start();
		} catch (SlickException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Game Class:


public class Game extends BasicGame {
	public Game(String title) {
		super(title);
		// TODO Auto-generated constructor stub
	}
	@Override
	public void render(GameContainer gc, Graphics g) throws SlickException {
		g.setColor(Color.red);
		g.fillRect(45, 45, 125, 100);
		g.setColor(Color.black);
		g.drawString("Hello. .__.", 60, 75);
	}
	@Override
	public void init(GameContainer gc) throws SlickException {	}
	@Override
	public void update(GameContainer gc, int ticks) throws SlickException { }
}

Here’s my code for my HTML file.


<applet code="org.lwjgl.util.applet.AppletLoader"
   archive="lwjgl_util_applet.jar, lzma.jar"
   codebase="." width="350" height="250">
   <param name="al_title" value="test">
   <param name="al_main" value="org.newdawn.slick.AppletGameContainer">
   <param name="game" value="net.ghostid.Main">
   <param name="al_jars" value="game.jar, slick.jar, lwjgl.jar.pack.lzma, jinput.jar.pack.lzma, lwjgl_util.jar.pack.lzma">
   <param name="al_windows" value="natives/windows_natives.jar.lzma">
   <param name="al_linux" value="natives/linux_natives.jar.lzma"> 
   <param name="al_mac" value="natives/macosx_natives.jar.lzma"> 
   <param name="al_solaris" value="natives/solaris_natives.jar.lzma">
   <param name="al_debug" value="true">
   <param name="separate_jvm" value="true">
   </applet>

Sorry for the sloppy code, tried making it as small as possible so this post wouldn’t be insanely long.
So what’s wrong? Why is my Applet just giving a white screen?

Thanks an advanced,
Once I get this working, I’ll make a CLEAR tutorial on how to make a slick2d applet… ._. I can’t seem to find a full one with source code.

#2

The “game” attribute should be the Game class, not the main class.
Use this instead:

#3

I changed the engine a little and the game class is also the main now but it still doesn’t work… Could you actually give me a working example?

#4

http://www.planc.ee/m1sterx/zombify/

From the page source:

<param name="al_main" value="org.newdawn.slick.AppletGameContainer"> 
<param name="game" value="com.sxp.zombify.ZombifyClient">


import org.newdawn.slick.BasicGame;
public class ZombifyClient extends BasicGame
{}

Note that this is the Game class, the main is a separate class.
Also, do You have java console running ? And You get no error there ?

#5

Java console? It compiled on Eclipse and ran perfectly fine. Java didn’t give a little red x on the top left of the screen so I suppose there is no errors. Anyway, I’ll check out that example you gave me. Maybe it’s just me being retarded. XD Thanks :slight_smile:

#6

Yes, Java Console. When You run an appplet or a webstart, then java starts the browser plugin which comes with the console. I believe, by default it’s disabled.
Control Panel -> Java -> Advanced Tab -> Java Console -> enable
Check it out. It might tell You something new or might not. Assume nothing

#7

Hum, ok I did get an error.

Unable to create game container
java.lang.RuntimeException: Unable to create game container
at org.newdawn.slick.AppletGameContainer.init(AppletGameContainer.java:147)
at org.lwjgl.util.applet.AppletLoader.switchApplet(AppletLoader.java:1330)
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)

And yes, I tried switching the game class to the game rather than the main and still got this error. Do I need to initialize the AppletGameContainer somewhere in my code? Set some settings (fps, window size etc…)?

#8

Nope, You don’t have to do anything with the applet container. However looking at the slick source, there should be more specific exception before the RuntimeException

#9

When using Slick Applets, the class that extends the BasicGame class can’t have parameter(s) in the constructor otherwise Slick is unable to make a new instance of it.

Change ‘public Game(String title)’ to ‘public Game()’ and the above error should no longer happen.

#10

Thank you! :slight_smile: Dude, this worked! I was expecting to have to do some ridiculous stuff xD
Thanks :slight_smile: