Javascript to Java communication using LiveConnect not working

I've been working on a project that requires communication both directions between Java and JavaScript. I have successfully managed to get it working under all browsers in OS X, but I'm now faced with the challenge of gett开发者_高级运维ing it to run on Windows under any browser. At the moment it simply doesn't work.

I'm just wondering if there is something special I need to do in order for JavaScript to communicate with Java?

My applet code looks like this:

<applet id='theApplet' 
    code="com/company/MyApplet.class" 
    archive="SMyApplet.jar" 
    height="50" width="900" 
    mayscript="true" scriptable="yes">
        Your browser is ignoring the applet tag.
</applet>

Once the applet has loaded, I then try to call functions on it like this:

 alert("Call some java:" + theApplet.testFunc());

And in the firebug console I get the following error:

theApplet.testFunc is not a function

I can confirm that this doesn't work in IE either.

When the page loads, I have the java console open and I can see that the applet is successfully loading and ready to accept calls.

Any help would be greatly appreciated!

Cheers

Update: Here is the stripped down java code exposing the public api that I'm trying to call.

package com.company;

import com.google.gson.Gson;

import java.applet.*;
import java.io.*;
import java.net.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.*;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.*;

import netscape.javascript.*;

public class MyApplet extends Applet implements Runnable
{
    public void init() 
    {
        JSON = new Gson();
        isReadyVar = 0;
        workThread = null;
    }

    public void start()
    {
    }

    public void run()
    {
        System.out.println("Done");             
    }


    public void stop()
    {
    }

    public void destroy()
    {
    }

    /* Public API */

    public int testFunc()
    {
        return 200;
    }
}

Update [SOLVED]:

I figured out what the problem was exactly. Turns out the Gson lib I was using wasn't signed; but my own jar was. Browsers on windows require that all libs are signed; so I packaged Gson in with my java files & signed the lot and it solved the problem! Thanks for everyones help!

I figured out what the problem was exactly. Turns out the Gson lib I was using wasn't signed; but my own jar was. Browsers on windows require that all libs are signed; so I packaged Gson in with my java files & signed the lot and it solved the problem! Thanks for everyones help!

alert("Call some java:" + document.getElementbyId("theApplet").testFunc());

Make sure the testFunc() method is declared as public access.

If that does not work, post the applet code as an SSCCE.

BTW

Incorrect

code="com/company/MyApplet.class" 

Correct

code="com.company.MyApplet" 

BTW 2

Incorrect

..scriptable="yes">

Correct

..scriptable="true">

Since the applet element is deprecated, I use following code, which works at least in Firefox:

<object id="MyApplet" classid="java:com.example.myapplet"
  codetype="application/java" codebase="bin/" height="10" width="10"
</object>