Failure to check Java version, while reading registry from JavaScript code

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
    <head>
        <title>Reading Registry Value</title>
        <script type="text/javascript">

            function readJREValue()
            {
            document.write("<b>Java Runtime Environment properties of your computer : </b>")
            document.write("<br>")
                var WshShell = new ActiveXObject("WScript.Shell");
                var value = WshShell.RegRead("HKLM\\Software\\JavaSoft\\Java Runtime Environment\\BrowserJavaVersion");
                document.write("Your JRE Browser Version Is: " + value);
                        document.write("<br>");
            };
        </script>
    </head>
    <body onload="javascript: readJREValue()">
    </body>
</html>

This code is working fine when i am running this from my desktop, But when i am trying to run from my localhost nothing happens...

Posted 11-Nov-13 1:16am

Rayan Khan

Updated 12-Nov-13 8:40am

Kornfeld Eliyahu Peter

v2

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2 solutions

Solution 1

Hello Ahmad,

For Security Reasons browsers won't allow JavaScript to access the local resources such as Disk, Files, Registry. Allowing such things via web browser would have pretty serious security consequences.

Regards,

Posted 11-Nov-13 1:37am

Prasad Khandekar

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Kornfeld Eliyahu Peter · Accepted Answer · 2013-11-11T01:41:00

It is a security issue.
In real word environment (not IDE debugging) your code runs inside the browser on the client machine AND TRY TO READS THE REGISTRY OF THE CLIENT!!!. However, browser security prevents from you to do so.

In any case I believe you missing here some point. Web applications by it's nature are parted to server-client... Means part of your code runs on the server and an other part on the client.
The part you presented here belongs to the client.

As I understand you want to check the installed Java version of the client. For that Oracle gives you JavaScript to do so...

Start here
http://docs.oracle.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html#deplToolkit[^]

A sample to display installed versions

HTML

<!DOCTYPE html>

<html>
<head>
    <meta charset="utf-8" />
    <script src="http://java.com/js/deployJava.js"></script>
    <title>JRE Versions</title>
</head>
<body>
    <div id="idJREs">

    </div>

    <script type="text/javascript">
        function getJREs() {
            document.getElementById('idJREs').innerText = deployJava.getJREs();
        }

        window.onload = getJREs;
    </script>
</body>

</html>