confused... applet won't run.

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10-11-2009, 12:30 AM
KM88

confused... applet won't run.

My applet runs fine in Eclipse, and previous applets I made work fine as well, but for some reason this one won't. Here is my code:

package q5;

import javax.swing.JApplet;
import java.awt.*;

/**
* @author your name here
*
*/
public class BusinessCard extends JApplet {

Font textFont, textFont2, textFont3;

public void init() {
setSize(600, 400);
textFont = new Font("TimesNewRoman", Font.ITALIC + Font.BOLD, 40);
textFont2 = new Font("TimesNewRoman", Font.PLAIN + Font.BOLD, 20);
textFont3 = new Font("TimesNewRoman", Font.PLAIN, 14);

}

public void paint(Graphics g) {

int x, y; // x and y coordinates of upper left-corner of each shape
int width, height; // width and height of each shape

setBackground(Color.white);

g.drawRect(50, 50, 500, 300);

g.setColor(Color.cyan);
g.fillRect(51, 51, 499, 79);

g.setColor(Color.red);
g.fillOval(400, 65, 60, 50);

g.setColor(Color.green);
g.fillOval(430, 65, 60, 50);

g.setColor(Color.blue);
g.fillOval(460, 65, 60, 50);

g.setColor(Color.black);
g.setFont(textFont);
g.drawString("Sage Styling", 100, 102);
etc...

}
}

and then the HTML file is:

<html>
<applet code="BusinessCard.class" width=800 height=500>
</applet>
</html>

this is the error I get when I try to load the applet:

java.lang.NoClassDefFoundError: BusinessCard (wrong name: q5/BusinessCard)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Un known Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unk nown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unk nown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionR unnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NoClassDefFoundError: BusinessCard (wrong name: q5/BusinessCard)

any help would be greatly appreciated :) All files are in the same folder, and when I double click the HTML file I get this error. Nothing is misspelt, I'm unsure what to do :/
10-11-2009, 12:38 AM
r035198x

You didn't package your applet properly. The class is in a package called q5 so it's FQN is q5.BusinessCard.
Read Sun's tutorial to find out more.
10-11-2009, 12:55 AM
KM88

I changed my HTML file to

<html>
<applet code = 'q5.BusinessCard',
width = 800,
height = 500 />
</html>

like Sun's tutorial says to but it still can't find the BusinessCard.class. :/

my teacher added the "package q5;" line to our program. I'm not sure what it does, but when I try to delete it my whole program doesn't work.
10-11-2009, 01:00 AM
r035198x

Did you package the classes in a jar file and specify the location of the jar file?
10-11-2009, 04:09 AM
KM88

yeah I used Ant to package BusinessCard.class into bcard.jar

I then changed my HTML to:

<html>

<applet code = "BusinessCard"
archive = "bcard.jar"
width = 800 height = 500 />

</html>

for the code part I've tried all sorts of combinations such as q5.BusinessCard, q5\BusinessCard, BusinessCard, with it ending in .class, etc

still nothing has worked... :/ I've been trying to look up the info myself reading tutorials, but tbh I'm not sure what I'm doing wrong so it's kind of hard to find the info.
10-11-2009, 08:19 AM
r035198x

Don't try many different things. Just do what Sun's tutorial says. Did you put the class in a folder called q5 before creating the jar file?
10-11-2009, 06:21 PM
KM88

thank you r035198x, it works now.

no I hadn't created a q5 folder before creating the .jar file :/

on the Sun tutorial page you linked me they had:

<applet code = 'appletComponentArch.DynamicTreeApplet'
archive = 'DynamicTreeDemo.jar',
width = 300,
height = 300 />

I wasn't sure what that "appletComponentArch" part of the code was. Now I see it was just the folder DynamicTreeApplet was in.

thanks again! :)