How can I return some values from an applet invoked by jsp:plugin tag

My JSP is something like that:
<html>
     <head>
             <title> . . . </title>
     </head>
     <script>
          function getValueFromApplet()
               var src = document.pinApplet.checkPin();
               document.myForm.j_username.value = document.pinApplet.tokenizeName(src);
               alert(document.myForm.j_username.value);
               document.myForm.j_password.value = document.pinApplet.tokenizePassword(src);
               alert(document.myForm.j_password.value);
     </script>
        <body>
                <jsp:plugin type="applet"
                      code="PinApplet.class"
                   codebase="/idp"
                   name="pinApplet"
                            width="300"
                            height="300">
                     <jsp:fallback> Authentication Form is not supported by the browser </jsp:fallback>
          </jsp:plugin>
                <form action="https://xxx.xxx.xxx"
               name="myForm"
               method="post" onSubmit="return getValueFromApplet()">
          <table>
               <td><input type="submit" value="OK" >
               <td><input type="hidden" id="j_username" name="j_username" value=""></td>
               <td><input type="hidden" id="j_password" name="j_password" value=""></td>
          </table>
          </form>
     </body>checkPin() returns "alice--alice"
tokenizeName() returns the first token: alice
tokenizePassword() returns the second token: alice
When I test the applet in the IDE, it returns the values properly, but not in the JSP invokation.

evnafets wrote:
javascript will not be executing on the server. You can rule that one out.
Is your Applet being initialised correctly?
Where have you got the classes for it? I think the applet doesn't need any kind of initialization, because it doesn't have any variables and all the process is made in the method called by onsubmit()
The applet is composed only by one class and I'm totally sure that the class is placed in the correct place.
evnafets wrote:
I would say put in a couple more alerts - one before the call to the applet, one after.
put some logging statements in your applet to see if it gets there.In the javascript, there are two alerts between the three calls to the applet. Where do you advise me to put more alerts?
I don't understand what do you refer when you say "logging statements"
I am going to test again the call to the applet in order to find some kind of code that can be invalid or that can make the function to "crash"

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