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Are you sure you're looking at the Java Console? It's not visible by default.

If so, I'd recommend throwing in some print statements and looking at them in the Java Console to get to the bottom of...

I meant, do you see any errors in the Java Console when you run it in a webpage? When you see the gray box, does your Java Console have any errors?

Does it work if you view it through an IDE? Does your Java Console show any errors?