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Editorial Team
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Asked: 2026-06-17T15:17:15+00:00

I am having problems trying to run my applet file when I upload it

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I am having problems trying to run my applet file when I upload it on my website. It keeps giving me errors, but works perfectly fine on my computer. I am using NetBeans to create my Applets and I used the <Applet> tag, since I remember using it and it worked. But NetBeans did state a warning message stating that the <Applet> tag has been deprecated and advised to use <Object>.

Now this is where it gets a little harder for me, because I do not know how to use the <Object> tag for applets. I definitely searched for answers online. Each gives different ways of declaring it for an Applet, but none of them worked. NetBeans constantly returns a warning/error messages each time I attempted different methods stated online.

So my question would be this: how do I correctly use the <Object> tag for a Java Applet?

After much searching, I found an example that returns no value but does not even load the Applet on my computer. The example is below:
java code:

<object data="VirtualArmory.jar" type="application/x-java-applet"></object>

I have attempted both .jar and .class and the output is still the same. The Java plugin kept loading.

EDIT:

This is the error I got when I used the <Applet> tag. But did not get any when using the developJava.js.

java.lang.ClassNotFoundException: VirtualArmory
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

This is how I attempted the developJava.js command. Sorry since it is my first time seeing and using this command, I will tend to make a lot of mistakes.

<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var attributes = {
  codebase:'http://morganaprime.webs.com/',
    code:'VirtualArmory.class',
    archive:'VirtualArmory.jar',
    width:710, 
    height:540
};
var parameters = {gunSize:16};
var version = '1.6';
deployJava.runApplet(attributes, parameters, version);
</script>

I am randomly attempting what ever I can to make this work! This is the link to my testing website.
website here

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1 Answer

  1. Editorial Team

    So my question would be this: how do I correctly use the <Object> tag for a Java Applet?

    The correct answer is "don’t use it" (or the applet element). Instead delegate the responsibility for embedding the applet to deployJava.js. It might look something like this.

    <script src="http://www.java.com/js/deployJava.js"></script>
<script>
var attributes = {
    codebase:'http://morganaprime.webs.com/',
    code:'net.mp.eoncalculator.VirtualArmory',
    archive:'VirtualArmory.jar',
    width:710, 
    height:540
};
var parameters = {gunSize:16};
var version = '1.6';
deployJava.runApplet(attributes, parameters, version);
</script>

    But NetBeans did state a warning message stating that the <Applet> tag has been deprecated..

    Only since HTML 4.01 (which was a long time ago)!

    Update – working example

    Applet on-screen

    <html>
<body>
<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var attributes = {
    codebase:'http://morganaprime.webs.com/',
    code:'net.mp.eoncalculator.VirtualArmory',
    archive:'VirtualArmory.jar',
    width:1000,
    height:700
};
var parameters = {gunSize:16};
var version = '1.6';
deployJava.runApplet(attributes, parameters, version);
</script>
</body>
</html>
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