Problem with running an applet

Started by Dramentiaras, December 11, 2013, 16:50:25

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Dramentiaras

December 11, 2013, 16:50:25
Hi! I'm making a test game with lwjgl 2.9.1. The game should be able to run as an applet and it does, at least in Eclipse's Applet Viewer.
When I run an applet with the <applet> html tag, the applet fails to initialize. This is the stacktrace I get:

java.lang.ExceptionInInitializerError
	at org.lwjgl.Sys.createImplementation(Sys.java:124)
	at org.lwjgl.Sys.<clinit>(Sys.java:111)
	at org.lwjgl.opengl.Display.<clinit>(Display.java:135)
	at al.test.TestApplet.init(TestApplet.java:30)
	at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.init(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied ("java.util.PropertyPermission" "org.lwjgl.util.Debug" "read")
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at sun.plugin2.applet.AWTAppletSecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
	at java.lang.System.getProperty(Unknown Source)
	at java.lang.Boolean.getBoolean(Unknown Source)
	at org.lwjgl.LWJGLUtil$4.run(LWJGLUtil.java:454)
	at org.lwjgl.LWJGLUtil$4.run(LWJGLUtil.java:452)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.lwjgl.LWJGLUtil.getPrivilegedBoolean(LWJGLUtil.java:452)
	at org.lwjgl.LWJGLUtil.<clinit>(LWJGLUtil.java:265)
	... 7 more


As you can see, I get an ExceptionInInitializerError. From what I've read, that means that it failed to initialize a variable in the static scope.
The stacktrace points to this line:

Code: java
Display.setParent(parent);


In the following code:

Code: java
package al.test;

import java.applet.Applet;
import java.awt.Canvas;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;

public class TestApplet extends Applet {

	private Canvas parent;
	
	@Override
	public void init() {
		
		setSize(800, 600);
		
		parent = new Canvas();
		parent.setSize(getWidth(), getHeight());
		add(parent);
		parent.setFocusable(true);
		parent.requestFocus();
		parent.setIgnoreRepaint(true);
		setVisible(true);
		
		try {
			
			Display.setParent(parent);
			
			Display.create();
			Keyboard.create();
			Mouse.create();
			
		} catch (LWJGLException e) {
			e.printStackTrace();
		}
		
		Game game = new Game();
	}
	
	@Override
	public void destroy() {
		
		super.destroy();
	}
}


As I've understood it, the error exists in the Display class itself and I do not know how to fix this.

This my html file to run the applet:

Code: html
<!doctype html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
	<head>
	</head>
	<body>
		<applet code="al.test.TestApplet" archive="finished.jar" width="800" height="600"/>
	</body>
</html>


Thanks in advance!

kappa

#1
December 11, 2013, 17:38:21
Got of copy of what your html looks like?

Also looks like you might be using the unsigned LWJGL jars, download the LWJGL applet bundle which contains pre-signed LWJGL jars. (or alternatively sign them yourself with your own certificate),

Dramentiaras

#2
December 11, 2013, 20:07:13
I've updated the original thread with the html code.

I'm using JarSplice to create a single jar out of all the required jars, and therefor, the library jars shouldn't matter, right?
Does this mean I have to sign my own jar? If yes, how do I do it? I've never quite understood how to do it.

kappa

#3
December 11, 2013, 20:33:02
JarSplice can't be used for applets, its only for applications.

You'll have to use LWJGL's AppletLoader (recommended), see LWJGL wiki for a full in depth tutorial and LWJGL's Applet download bundle (for a working example) or look into using Java's JNLP Applets with natives.
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