Getting MAC address on a web page using a Java applet?

I don't think this will be possible. Web servers communicate with clients several layers above the link layer where MAC addresses live -- it's abstracted away by TCP/IP and there's no reason for the client to send it unless you specifically have client code to do that The reason your Java code isn't working is because the Java sandbox's security manager disallows such low-level calls -- which it should! If you ever do find a way to get that thing to work (which I doubt you will) you should promptly report it to Oracle because it shouldn't be happening at all I can't see much of a reason why you'd want it either, to be honest.

I don't think this will be possible. Web servers communicate with clients several layers above the link layer where MAC addresses live -- it's abstracted away by TCP/IP and there's no reason for the client to send it unless you specifically have client code to do that. The reason your Java code isn't working is because the Java sandbox's security manager disallows such low-level calls -- which it should!

If you ever do find a way to get that thing to work (which I doubt you will) you should promptly report it to Oracle because it shouldn't be happening at all. I can't see much of a reason why you'd want it either, to be honest.

The Java applet is prevented to access those methods on the client because it runs in a protected sandbox.

It might not be possible within a browser, since it is against the sandboxing paradigm. You might have some luck with browser-specific native code extensions. However, the important exception is if your web server is in the same local area network (same switch) as the client - then, the MAC address of the client is known to the server because it is still present in the IP packet.

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