I'd dropped the Java-based control for the StormVueNGX system a while back. It uses Flash instead, but.. Adobe issued 3 critical patches in the last 2 weeks for zero-day exploits in the wild, so even Flash's days may be numbered. Something with JavaScript+SVG+HTML5 would be a good replacement from Astrogenics. Unfortunately, JavaScript/SVG/HTML5 can't be 'privatized' and if they want to continue selling StormVueNGX, they may have to adopt a different business model (Open Source?).
Nevertheless, Blitzortung is going to give them (Boltek/Astrogenics) some good competition, especially with the pre-assembled BLUE system.
So, no work-around for older sites using Java as yet except to have them upgrade to StormVueNGX.