If you go to this web page
and it complains that you don't have Java installed, it should make you feel better. At least, from a security perspective.
If an application you have buried some JRE in the depths of your system, but it isn't accessible in the normal directories, and it isn't in your path (">java -version" doesn't work) then the primary downsides of having Java on your computer are mitigated.
If malware cannot find your Java installation, then it can't exploit it.