[prasadw 96/07/25]
We have found that a harmless single line change in an applet causes
the appletviewer to throw a NoClassDefFoundError. The interesting thing
is that if the package name of the applet is changed to "admin" things
work fine even with the change. It is so bizarre that I will just
include the log and let you draw the conclusions. This error first appeared
in the Jeeves admin GUI and we have narrowed it down to the following
test applets.

The two files are no.html and yes.html with the contents given below.
yes.html works; no gives the NoClassDefFoundError.

no.html
::::::::::::::
<applet code="sun.No.class" width=572 height=650>
</applet>

yes.html
::::::::::::::
<applet code="sun.Yes.class" width=572 height=650>
</applet>

$ pwd
/home/prasadw/src/java_expt/noclassdeffound/package_sun
$ unset CLASSPATH; echo $CLASSPATH

$ av yes.html
Yes.init
Yes.paint
^C$ av no.html
No.init
java.lang.NoClassDefFoundError: sun/Banner
at sun.No.init(No.java:10)
at sun.applet.AppletPanel.run(AppletPanel.java:259)
at java.lang.Thread.run(Thread.java)
^C$ ls
no.html sun/ yes.html
$ ls sun
Banner.class No.class Yes.class
Banner.java No.java Yes.java
$ more sun/*.java
::::::::::::::
sun/Banner.java
::::::::::::::
package sun;

import java.awt.*;

/**
 * This is a simple component which displays an image.
 */

public class Banner extends Canvas {
    Image image;

    public Banner(Image image) {
        this.image = image;
    }

    public void paint(Graphics g) {
        g.drawImage(image, 0, 0, this);
    }
}
::::::::::::::
sun/No.java
::::::::::::::
package sun;

import java.applet.*;
import java.awt.*;

public class No extends Applet {
    Banner banner;

    public void init() {
        System.out.println("No.init");
        banner = new Banner(getImage(getDocumentBase(), "banner.gif"));
    }

    public void paint(Graphics g) {
        System.out.println("No.paint");
    }
}
::::::::::::::
sun/Yes.java
::::::::::::::
package sun;

import java.applet.*;
import java.awt.*;

public class Yes extends Applet {
    Banner banner;

    public void init() {
        System.out.println("Yes.init");
        banner = new Banner(getImage(getDocumentBase(), "banner.gif"));
    }

    public void paint(Graphics g) {
        System.out.println("Yes.paint");
        int i = banner.size().height;
    }
}