I DO know the answer.
Both IE and Netscape fall behind in supporting Java 2.
So they cannot find JApplet. In another word, they don't support
Here are two approaches
1) Dowbload Java Plug-in 1.3 from Sun, install it with
2) Fall back to java.awt. package, for instance,
JButton ---> Button.
Now why did it work with Jbuildr 3?
Jbuilder 3 uses appletviewer to parse your Applet.