Using Applets in JavaScript

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mexicanopelon - 04 Mar 2005 14:33 GMT

Greetings,

Although I am familiar with JavaScript, I am new to the concept of
using Applets in JS. Here is what I am trying to do. I have an Applet

will call "FooApplet" with some "fooFunction" returning a String. The
applet accesses a class "ExternalClass" with some "externalFunc"
returning a String. "ExternalClass" is part of a .jar file will call
"externals.jar".

public class FooApplet extends Applet {

public String fooFunction(String input1, String input2) {
do some stuff....
ExternalClass ec = new ExternalClass();
return (ec.externalFunc(param1, param2);
}

}

In my JavaScript file I am calling the "fooFunction" as follows:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<TITLE></TITLE>

<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</HEAD>

<BODY BGCOLOR="WHITE">
<H1>Queue Depth</H1>

<APPLET CODE="FooApplet" ARCHIVE="externals.jar" WIDTH=10 HEIGHT=10
NAME="fooApp">
</APPLET>

Click the link to see something:
<A onClick="doSomething()"> Do Something </A>

</BODY>
</HTML>

The Java code compiles fine. When I open the HTML page it shows up
fine and the status bar indicates that the Applet has started. When I
click on the link I get a "java.lang.NoClassDefFoundError". I have
determined that problem is linked to the Applet trying to access the
function in the "ExternalClass", because it works when I replace
'return (ec.externalFunc(param1, param2)' with a simple 'return
("Hello");'. As you can see I even tried adding the external .jar file

to the ARCHIVE attribute, but it still doesn't work.

If you have any suggestions, please let me know?

Thanks.

Reply to this Message

William Brogden - 04 Mar 2005 15:24 GMT

> Greetings,
>
[quoted text clipped - 5 lines]
> returning a String. "ExternalClass" is part of a .jar file will call
> "externals.jar".

IF your applet and external class are not presently in a package,
the first thing I would try is putting both in a package. Finding
classes not in a package is chancy.

> public class FooApplet extends Applet {
>
[quoted text clipped - 50 lines]
>
> Thanks.

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Reply to this Message

mexicanopelon - 04 Mar 2005 15:59 GMT

Hi William,

Thanks for the reply. My external package is definitely in a package,
my applet is not. Do you think it will help if I add it to a package?
Will it matter if they are not part of the same package?

Thanks,

Carlos

Reply to this Message

William Brogden - 05 Mar 2005 13:41 GMT

> Hi William,
>
> Thanks for the reply. My external package is definitely in a package,
> my applet is not. Do you think it will help if I add it to a package?

Like I said - that is what I would try - I always try the simplest
fixes first : )

> Will it matter if they are not part of the same package?

That should not matter.

Reply to this Message

Using Applets in JavaScript

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