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  1. 01-31-2012, 10:23 PM #1
    stainluss
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    Default Simple rectangle display applet doesn't work in browser

    I got the code from a beginner's book called Big Java..

    Here's the error I get from Firefox:
    Java Code: 
    Java Plug-in 1.6.0_22
Using JRE version 1.6.0_22-b04 Java HotSpot(TM) Client VM


java.lang.ClassFormatError: Incompatible magic value 1768779887 in class file RectangleApplet
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(Unknown Source)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassFormatError: Incompatible magic value 1768779887 in class file RectangleApplet
    Here's the code:

    Java Code: 
    import javax.swing.JApplet;
import java.awt.Rectangle;
import java.awt.Graphics;
import java.awt.Graphics2D;

/* an applet that draws 2 rectangles*/
public class RectangleApplet extends JApplet{
	public void paint(Graphics g){
		/* Prepare extended graphics */
		Graphics2D g2 = (Graphics2D) g;
		
		/*Construct a rectangle and draw it*/
		Rectangle box = new Rectangle(15,15,60,60);
		g2.draw(box);
		
		/*Move rectangle 15 across and 20 down */
		box.translate(15, 20);
		
		/*Draw moved rectangle */
		g2.draw(box);
		
		
		
	}

}
    And the HTML that I used:
    XML Code: 
    <html>
<head>Rectangles</head>
<body>
<applet code="RectangleApplet.class" width="300" height="400">
</applet></body>
</html>
    Im using Eclipse, any help would be appreciated
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  2. 01-31-2012, 10:33 PM #2
    Norm's Avatar
    Norm
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    Default Re: Simple rectangle display applet doesn't work in browser

    Incompatible magic value 1768779887 in class file RectangleApplet
    It looks like your .class file is corrupted.
    Create a new one and try again

    That number converts to the letters: impo
    Is your .class file a renamed .java file?
    Last edited by Norm; 01-31-2012 at 10:36 PM.
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  3. 01-31-2012, 10:58 PM #3
    stainluss
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    Default Re: Simple rectangle display applet doesn't work in browser

    Quote Originally Posted by Norm View Post
    It looks like your .class file is corrupted.
    Create a new one and try again

    That number converts to the letters: impo
    Is your .class file a renamed .java file?
    Thanks for the response.

    I think I may know why. In Eclipse, I started a 'new class' file to make this, but when I ran it it was auto-saved as a '.java' file it didnt work in the html as this (should it have?), so then I manually changed the end of it to '.class'.

    I'll save it myself as .class this time and give it a go.

    Quote Originally Posted by Norm View Post
    That number converts to the letters: impo
    Is your .class file a renamed .java file?
    Just saw your edit there, yes it is! I saw that number translated on a different site as that, I was thinking it was the 'import' part? But thats there in a class file too? Sorry if I seem a bit knucleheaded about this lol
    Last edited by stainluss; 01-31-2012 at 11:01 PM.
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  4. 01-31-2012, 11:56 PM #4
    stainluss
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    Default Re: Simple rectangle display applet doesn't work in browser

    Quote Originally Posted by Norm View Post
    It looks like your .class file is corrupted.
    Create a new one and try again

    That number converts to the letters: impo
    Is your .class file a renamed .java file?
    Tried it again. Every time I try to create a new class in eclipse, it saves it as a .java file and then I guess when I change it to .class it becomes corrupt..
    Anybody know how to overcome this?
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  5. 02-01-2012, 12:00 AM #5
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    Default Re: Simple rectangle display applet doesn't work in browser

    You need to ask someone about how to use the IDE. There is a part of this forum site for IDEs.

    Every time I try to create a new class in eclipse, it saves it as a .java file
    Have you tried compiling the .java source file? The output from a successful compile is a .class file.
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  6. 02-01-2012, 12:32 AM #6
    Fubarable's Avatar
    Fubarable
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    Default Re: Simple rectangle display applet doesn't work in browser

    The class files can be found in the bin directory, not the src directory.
    How to use Code Tags
    How to Ask Smart Questions
    The Short, Self Contained, Correct (Compilable), Example or SSCCE
    So, You Need to Write a Program but Don't Know How to Start
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  7. 02-01-2012, 12:34 AM #7
    stainluss
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    Default Re: Simple rectangle display applet doesn't work in browser

    Quote Originally Posted by Fubarable View Post
    The class files can be found in the bin directory, not the src directory.
    Yessssssssssss :D
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  8. 02-01-2012, 12:38 AM #8
    Fubarable's Avatar
    Fubarable
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    Default Re: Simple rectangle display applet doesn't work in browser

    But regardless, you should learn how to "Export" your project and create a jar file. The Eclipse help files can help with this.
    How to use Code Tags
    How to Ask Smart Questions
    The Short, Self Contained, Correct (Compilable), Example or SSCCE
    So, You Need to Write a Program but Don't Know How to Start
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