The result of running ANY Java application or a website with a java applet on it. Your computer will run very slow and possible run out of virtual memory.
The only reason Java can survive is because it is multi platform. Aside from that it is a terrible language and should never be used in a professional industry.
"FFS I loaded JRE and JDK just to crack a Coldfusion hash and now my VM wont boot. Fucking Javaids"