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Problem with inter-applet communication

1 reply on 1 page. Most recent reply: Jan 26, 2006 12:41 AM by brajesh rathore

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Roki

Posts: 5
Nickname: rambo
Registered: Nov, 2002

Problem with inter-applet communication

Posted: Oct 9, 2005 4:24 AM

I have inter-applet communication between two applets at my JSP page.
It work's OK, but when I put them into separate JAR archives they get loaded and started correctly at my JSP page, but they does't see each other (no inter-applet communication).
e.g., I got the following error:


java.lang.NoClassDefFoundError: com/myadd/pak1/Applet1
  at com.myadd.pak2.Applet2.updateOtherApplets(Applet2.java:392)
  at com.myadd.pak2.Applet2.access$500(Applet2.java:27)
...

Both applets contains updateOtherApplets method and it is very simillar.
For example, here is code excerpt from Applet2, so you can see how it is implemented:


private void updateOtherApplets() {
        try {
            Enumeration e = getAppletContext().getApplets();
            while (e.hasMoreElements()) {
                Applet aplet = (Applet)e.nextElement();
                if (aplet instanceof Applet1) {
                    ql = calc(param1, ((Applet1)aplet).getT());
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

And there is code excerpt from my JSP page:


<jsp:plugin type="applet" code="com.myadd.pak1.Applet1.class" 
archive="applet_1.jar"  codebase="/appcxt" 
vspace="0" hspace="0" width="100" height="300" jreversion="1.4.1" >
   <jsp:params>
   ...
   </jsp:params>
</jsp:plugin>
...
<jsp:plugin type="applet" code="com.myadd.pak2.Applet2.class" 
archive="applet_2.jar"  codebase="/appcxt" 
vspace="0" hspace="0" width="100" height="300" jreversion="1.4.1" >
   <jsp:params>
   ...
   </jsp:params>
</jsp:plugin>

Why there is no inter-applet communication between applets when I put them into JAR archives?

brajesh rathore

Posts: 1
Nickname: brajesh
Registered: Jan, 2006

Re: Problem with inter-applet communication

Posted: Jan 26, 2006 12:41 AM

Hi,
Iam also getting the same problem for interapplet communication using the JSP plugin Tag.
The first Applet itself not loads and gives the error
"Applet notninitialized".

I have read lot of articles related to it and found that there is no solution for this type of problem.
My code is as below. I am using hidden applets in JSP plugin tags. If u found some solution, Please let me know.
Thanks
brajesh

--------------------------------------------------------- -
<%@ page language="java" %>

<HTML>

<HEAD>
<TITLE> WELCOME PAGE</TITLE>

</HEAD>

<script language="JavaScript">

</script>

<body onLoad="init()">

<p align="center">WELCOME PAGE</p>
<BR>
<p align="center">Please wait while applet loads</p>
<p align="center">Please allow the applet to read the System Information</p>

<div id="myapplet1" style="visibility:hidden">
<%{ %>
<jsp:plugin
type="applet"
archive="/lib/combinedregistry_systemInfo.jar"
code="registryInfoApplet.class" codebase="/applet"
name="registryInfoApplet "
>
</jsp:plugin>
<%} %>
</div>

<div id="myapplet2" style="visibility:hidden">
<%{ %>
<jsp:plugin
type="applet"
archive="/lib/combinedregistry_systemInfo.jar"
code="systemInfoApplet.class" codebase="/applet"
name="systemInfoApplet"
>
</jsp:plugin>
<%} %>
</div>

</body>
</HTML>
--------------------------------------------------

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