Auto detect missing java plugin with Netscape

How do I get Netscape to automatically detect that it is missing the Java Plugin, and go to Sun's download page? I have IE 5.5 and Netscape 7 installed.
My html looks like this:
<OBJECT
classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
codebase = "http://java.sun.com/products/plugin/1.4/jinstall-1_4-windows-i586.cab#Version=1,4,1,0"
WIDTH = "100%" HEIGHT = "500" >
<PARAM NAME = CODE VALUE = "nz.astarte.planwise.gantt.GanttApplet" >
<PARAM NAME = CODEBASE VALUE = "." >
<PARAM NAME = ARCHIVE VALUE = "pwgantt.jar" >
<PARAM NAME = "type" VALUE = "application/x-java-applet;version=1.4">
<PARAM NAME = "scriptable" VALUE = "false">
<PARAM NAME = "projectId" VALUE="<%=theForm.getProjectId().toString()%>" >
<PARAM NAME = "userId" VALUE="<%=userId%>" >
<PARAM NAME = "logLevel" VALUE="INFO" >
<COMMENT>
<EMBED
type = "application/x-java-applet;version=1.4"
CODE = "nz.astarte.planwise.gantt.GanttApplet"
JAVA_CODEBASE = "."
ARCHIVE = "pwgantt.jar"
WIDTH = "100%"
HEIGHT = "500"
projectId ="<%=theForm.getProjectId().toString()%>"
userId ="<%=userId%>"
logLevel ="INFO"
scriptable = false
pluginspage = "http://java.sun.com/getjava ">
<NOEMBED>
Could not find a plugin supported by your browser. Please download Sun's Java Plugin 1.4.1
</NOEMBED>
</EMBED>
</COMMENT>
</OBJECT>
IE will autodetect and begin the download process. I know Netscape doesn't auto download, but it should at least detect it needs the plugin and go to the http://java.sun.com/getjava page so the user can do a manual download. However all I get is a big black blob where my applet should be.
Thanks in advance,
Andrew

I have modified your EMBED tag a little bit. I think it should work:
<EMBED
type="application/x-java-applet;jpi-version=1.4.1"
CODE="nz.astarte.planwise.gantt.GanttApplet"
CODEBASE="."
ARCHIVE="pwgantt.jar"
WIDTH="100%"
HEIGHT="500"
projectId="<%=theForm.getProjectId().toString()%>"
userId="<%=userId%>"
logLevel="INFO"
scriptable=false
pluginspage="http://java.sun.com/j2se/1.4.1/download.html">
<NOEMBED>
Could not find a plugin supported by your browser. Please download Sun's Java Plugin 1.4.1
</noembed>
</embed>
Hope it helps!
A.A.
How do I get Netscape to automatically detect that it
is missing the Java Plugin, and go to Sun's download
page? I have IE 5.5 and Netscape 7 installed.
My html looks like this:
<OBJECT
classid =
d = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
codebase =
e =
"http://java.sun.com/products/plugin/1.4/jinstall-1_4-w
ndows-i586.cab#Version=1,4,1,0"
WIDTH = "100%" HEIGHT = "500" >
<PARAM NAME = CODE VALUE =
E = "nz.astarte.planwise.gantt.GanttApplet" >
<PARAM NAME = CODEBASE VALUE = "." >
<PARAM NAME = ARCHIVE VALUE = "pwgantt.jar" >
<PARAM NAME = "type" VALUE =
E = "application/x-java-applet;version=1.4">
<PARAM NAME = "scriptable" VALUE = "false">
<PARAM NAME = "projectId"
Id" VALUE="<%=theForm.getProjectId().toString()%>" >
<PARAM NAME = "userId" VALUE="<%=userId%>" >
<PARAM NAME = "logLevel" VALUE="INFO" >
<COMMENT>
<EMBED
type =
type = "application/x-java-applet;version=1.4"
CODE =
CODE = "nz.astarte.planwise.gantt.GanttApplet"
JAVA_CODEBASE = "."
ARCHIVE = "pwgantt.jar"
WIDTH = "100%"
HEIGHT = "500"
projectId
projectId ="<%=theForm.getProjectId().toString()%>"
userId ="<%=userId%>"
logLevel ="INFO"
scriptable = false
pluginspage = "http://java.sun.com/getjava ">
<NOEMBED>
Could not find a plugin supported by your
ted by your browser. Please download Sun's Java Plugin
1.4.1
</noembed>
</embed>
</COMMENT>
</object>
IE will autodetect and begin the download process. I
know Netscape doesn't auto download, but it should at
least detect it needs the plugin and go to the
http://java.sun.com/getjava page so the user can do a
manual download. However all I get is a big black blob
where my applet should be.
Thanks in advance,
Andrew

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email: [email protected]

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cd your_netscape_dir/plugins
ln -s /usr/java/jdk1.3.1/jre/bin/plugin/ns4/javaplugin.so try to fid netscape dir in /usr/lib/netscape/ or /usr/local/netscape ..
Iulian

I am running 10.5.8, and just updated my java to java 5 update10. Now my firefox is missing the Java plugin, and I can't load any Java applet at all. When I try it with Safari, it hangs when certain Java applet loads. HELP!!!

Suddenly my Java plugin is missing and i can't load any Java with Firefox at all, even though i have it enabled in the browser! i've tried loading in java embedding plugin, but it doesn't work. what should i do???

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If it's enabled, how can it be missing?
If this doesn't work, ask here. No need to register. Make sure you put (Mac) in the title.
http://forums.mozillazine.org/viewforum.php?f=38
Message was edited by: WZZZ
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If you have a different version of plugin,
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6. examine code
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**********************HTML FILE BEGIN***********
<HTML>
<HEAD>

<TITLE>Detect Java Runtime</TITLE>
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
var browsername;
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for (i=0; i < navigator.plugins.length; i++)
for (j = 0; j < navigator.plugins.length; j++)
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if(applet == null)
alert("You are running Microsoft Browser.\nPlease, install Java Runtime Environment 1.3.0");
return;
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if(version == "1.3.0")
alert("You are running IE, Java Plugin 1.3.0 installed - OK");
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alert("You are running IE, other plugin installed - mybe OK if later that 1.3.0\nYour version: " + version);
function getJava()
var applet = document.myApplet;
if(applet == null)
alert("Please, install Java Runtime Environment");
return;
     alert("JRE Version: " + document.myApplet.getJavaVersion());
function checkJavaPlugin()
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     if(browsername.indexOf("Netscape")!= -1)
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          doNetscape();
     else
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               browsername="MSIE";
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          else
               browsername="N/A";
               alert("Unknown browser: " + browsername);
</SCRIPT>
<body>
<Strong>Check Java Plugin</strong>
<OBJECT id="myApplet" classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
     WIDTH = 1
     HEIGHT = 1 >
     <PARAM NAME = CODE VALUE = "DetectPluginApplet.class" >
     <PARAM NAME="scriptable" VALUE="true" >
     <embed type="application/x-java-applet;version=1.3"
          code = DetectPluginApplet width = 2 height = 2 MAYSCRIPT = "true" >
     </embed>
     </EMBED>
</object>
<FORM>
     <INPUT TYPE="button" value="Get Plugin Version in IE" onClick="getJava()">
     <INPUT TYPE="button" value="Check Java Plugin in NS and IE" onClick="javascript:checkJavaPlugin()">
</FORM>
</BODY>
</HTML>
**********************HTML FILE END***********
***************APPLET FILE BEGIN***********
import java.awt.*;
public class DetectPluginApplet extends java.applet.Applet
     public void init()
          add(new Label("DetectPluginApplet"));
public String getJavaVersion()
return System.getProperty("java.version");
**************APPLLET FILE END************

Try following java script, it works on new browsers (NS 4+, IE5+). For IE you have to enable 'ActiveX objects creation' in security options.
var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_nav = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
&& (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
&& (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
var is_nav4up = (is_nav && (is_major >= 4));
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
var is_ie5_5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
var is_ie6 = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.0") !=-1));
var is_ie5up = (is_ie && (is_major == 4)
&& ( (agt.indexOf("msie 5.0")!=-1)
|| (agt.indexOf("msie 5.5")!=-1)
|| (agt.indexOf("msie 6.0")!=-1) ) );
var pluginDetected = false;
var activeXDisabled = false;
// we can check for plugin existence only when browser is 'is_ie5up' or 'is_nav4up'
if(is_nav4up) {
// Refresh 'navigator.plugins' to get newly installed plugins.
// Use 'navigator.plugins.refresh(false)' to refresh plugins
// without refreshing open documents (browser windows)
if(navigator.plugins) {
navigator.plugins.refresh(false);
// check for Java plugin in installed plugins
if(navigator.mimeTypes) {
for (i=0; i < navigator.mimeTypes.length; i++) {
if( (navigator.mimeTypes[ i].type != null)
&& (navigator.mimeTypes[ i].type.indexOf(
"application/x-java-applet;jpi-version=1.3") != -1) ) {
pluginDetected = true;
break;
} else if (is_ie5up) {
var javaVersion;
var shell;
try {
// Create WSH(WindowsScriptHost) shell, available on Windows only
shell = new ActiveXObject("WScript.Shell");
if (shell != null) {
// Read JRE version from Window Registry
try {
javaVersion = shell.regRead("HKEY_LOCAL_MACHINE\\Software\\JavaSoft\\Java Runtime Environment\\CurrentVersion");
} catch(e) {
// handle exceptions raised by 'shell.regRead(...)' here
// so that the outer try-catch block would receive only
// exceptions raised by 'shell = new ActiveXObject(...)'
} catch(e) {
// Creating ActiveX controls thru script is disabled
// in InternetExplorer security options
// To enable it:
// a. Go to the 'Tools --> Internet Options' menu
// b. Select the 'Security' tab
// c. Select zone (Internet/Intranet)
// d. Click the 'Custom Level..' button which will display the
// 'Security Settings' window.
// e. Enable the option 'Initialize and script ActiveX controls
// not marked as safe'
activeXDisabled = true;
// Check whether we got required (1.3+) Java Plugin
if ( (javaVersion != null) && (javaVersion.indexOf("1.3") != -1) ) {
pluginDetected = true;
if (pluginDetected) {
// show applet page
} else if (confirm("Java Plugin 1.3+ not found, Do you want to download it?")) {
// show install page
} else {
// show error page
}

Auto detect missing java plugin with Netscape

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