I have my Browser enabled java in options. I still get this page requires a java enabled web browser if your browser does support java, then you may not have it enabled
I suspect you are trying to view a page the blackberry browser is not capable of resolving. You might try another browser. And if you share the url maybe someone can give you precise information.
Be sure that you understand the difference between Javascript (which the BlackBerry browser can understand) and Java applications (which the BlackBerry browser typically cannot understand).