How to configure Java Plug-In in Mozilla 1.4 and Netscape 7 on Red Hat 9?

How to configure the java plug-in (Java 2 v1.4.2) to work on Mozilla 1.4 and Netscape 7 on Red Hat 9?
Thanks in advance.

I have redhat 9 and mozilla 1.2. Installed java sdk 1.4.2 which comes with JRE 1.4.2. Had no problems/errors while installing. The about plugin page doesnot indicate that the plugin is installed. and i get the pop-up saying application/x-java-vm is not available while browsing. Any help here please ??
Thanks

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Hi there,
Basicaly, the idea behind is to write objects in Java to replace or extend functionnalities of a web page (like XMLHttpRequest object). Those objects should support event handler writen in Javascript.
My first idea was to create JavaBeans and instantiate them through OBJECT tags in HTML (not as ActiveX objects). I don't find a way to instatiate a Javabean which was not also an applet.
Does someone knows how to ?
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(invocation of the method works but returns null)
But, if you access the same object form inside Java starting by
JSObject.getWindows(...) and so on, it works fine.
IE works in all cases.
Example, with the Java applet and HTML below :
. Java applet :
| package JavaJS;
|
| import netscape.javascript.*;
|
| public class FirefoxApplet
|        extends java.applet.Applet {
|   netscape.javascript.JSObject win = null;
|
|   public void init() {
|     win = netscape.javascript.JSObject.getWindow(this);
|   }
|
|   public Object getJSObjectMember( netscape.javascript.JSObject jso, String member ) {
|     return jso.getMember(member);
|   }
|
|   public netscape.javascript.JSObject getJSObjectFromPath( String jsoPath ) {
|     String [] jsoNames = jsoPath.split("\\.");
|     netscape.javascript.JSObject jso = win;
|
|     for( int i = 0; ( i < jsoNames.length ); i++ )
|       jso = (netscape.javascript.JSObject)jso.getMember(jsoNames);
|
| return jso;
| }
|
| public Object getJSObjectPathMember( String jsoPath, String member ) {
| return getJSObjectMember(getJSObjectFromPath(jsoPath),member);
| }
| }
[i]. HTML page :| <HTML>
| <HEAD>
| <TITLE>FirefoxApplet</TITLE>
| <META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
| <META http-equiv="Content-Script-Type" content="text/javascript">
| <SCRIPT>
| var ffxa = null;
| var txa = null;
|
| var o = {
| s : "object o, member s",
| o : {
| s : "object o.o, member s"
| }
| }
|
| function go() {
| print(ffxa.getJSObjectMember(o,"s"));
| print(ffxa.getJSObjectMember(o.o,"s"));
| print(ffxa.getJSObjectPathMember("o","s"));
| print(ffxa.getJSObjectPathMember("o.o","s"));
| print(ffxa.getJSObjectMember(ffxa.getJSObjectFromPath("o"),"s"));
| print(ffxa.getJSObjectMember(ffxa.getJSObjectFromPath("o.o"),"s"));
| }
|
| function print( text ) {
| txa.value = txa.value+text+"\n";
| }
|
| function loaded() {
| ffxa = document.getElementById("ffxa");
| txa = document.getElementById("txa");
|
| }
| </SCRIPT>
| </HEAD>
| <BODY onload="loaded()">
| <APPLET id="ffxa"
| code="JavaJS.FirefoxApplet.class"
| width="0"
| height="0"
| MAYSCRIPT>
| </APPLET><BR>
| <INPUT type="button" onclick="go()" value="Go"><BR>
| <TEXTAREA id="txa" rows="10" cols="40"></TEXTAREA>
| </BODY>
| </HTML>
When the HTML page has loaded, a click on the Go button gives :
. Firefox output :
| null
| null
| object o, member s
| object o.o, member s
| null
| null
. IE output :
| object o, member s
| object o.o, member s
| object o, member s
| object o.o, member s
| object o, member s
| object o.o, member s
2/ Internet Explorer / JSObject
As we have seen in the previous example, passing Javascript object to
an applet method works. Here, the problem comes when a Javascript object
is pass to a method that's not an applet's method.
If within the applet, you instantiate a new Java object and then
call from Javascript a method on this object with a Javascript object as
parameter then an Exception is raised when invoking that method.
Firefox works fine here.
Example, with the Java applet and HTML page below :
. Java applet :
| package JavaJS;
|
| public class IEApplet extends java.applet.Applet {
|
|   public void init() {
|   }
|
|   public Object echo( Object object ) {
|     return object;
|   }
|
|   public Object newEcho() {
|     return new Echo();
|   }
| }
. Java Echo class
| package JavaJS;
|
| public class Echo {
|
|   public Echo() {
|   }
|
|   public Object echo(Object object) {
|     return object;
|   }
| }
. HTML page :
| <HTML>
|   <HEAD>
|     <TITLE>IEApplet</TITLE>
|     <META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|     <META http-equiv="Content-Script-Type" content="text/javascript">
|     <SCRIPT>
|       var iea = null;
|       var txa = null;
|
|       var o = {
|         s : "object o, member s",
|         o : {
|           s : "object o.o, member s"
|         }
|       }
|
|       function go() {
|         print(iea.echo(o));
|         print(iea.newEcho().echo(o));
|       }
|
|       function print( text ) {
|         txa.value = txa.value+text+"\n";
|       }
|
|       function loaded() {
|         iea = document.getElementById("iea");
|         txa = document.getElementById("txa");
|
|       }
|     </SCRIPT>
|   </HEAD>
|   <BODY onload="loaded()">
|     <APPLET id="iea"
|             code="JavaJS.IEApplet.class"
|             width="0"
|             height="0"
|             MAYSCRIPT>
|     </APPLET><BR>
|     <INPUT type="button" onclick="go()" value="Go"><BR>
|     <TEXTAREA id="txa" rows="10" cols="40"></TEXTAREA>
|   </BODY>
| </HTML>When the HTML page has loaded, a click on the Go button gives :
. Firefox output :
| [object Object]
| [object Object]
. IE output :
| [object Object]
with this Exception on the second method invocation :
| java.lang.ClassCastException
|      at sun.plugin.com.DispatchImpl.convertParams(Unknown Source)
|      at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
|      at sun.plugin.com.DispatchImpl$1.run(Unknown Source)
|      at java.security.AccessController.doPrivileged(Native Method)
|      at sun.plugin.com.DispatchImpl.invoke(Unknown Source)
| java.lang.Exception: java.lang.ClassCastException
|      at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
|      at sun.plugin.com.DispatchImpl$1.run(Unknown Source)
|      at java.security.AccessController.doPrivileged(Native Method)
|      at sun.plugin.com.DispatchImpl.invoke(Unknown Source)There is a workaround for this, it's possible to wrap the Javascript object
in a Java object with an applet method and then use this Java object as
parameter.
Anyway, my questions are : regarding points 1/ and 2/ are these bugs with the Sun Java Plug-in ? or someone could explain these behaviors ?
Thanks for your reading.
Software infos :
. Firefox version 1.0.7
. Internet Explorer version 6.0.2800.1106 / JScript version 5.6
. Plug-in Java(TM): Version 1.4.2_08
. JSDK version 1.4.2_08
. Windows 2000 Server version 5.00.2195 sp4

Please test with the new Java Plug-In available in 6u10 at http://jdk6.dev.java.net/6u10ea.html. The Java/JavaScript bridge has been completely rewritten and is now more complete and portable than ever before. Longstanding issues should be fixed with this new version. Please try it and post if you continue to have problems.

How to configure Java Plug-In in Mozilla 1.4 and Netscape 7 on Red Hat 9?

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