使用LiveConnect的Javascript到Java通信无法正常工作

<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>

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

theApplet.testFunc is not a function

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;
    }
}