"Reopen the Java Control Panel" doesn't do anything From System Preferences, I open the Java icon and it shows:


And that's all. The "Reopen the Java Control Panel" button doesn't do anything. There isn't any separate window anywhere.

macOS High Sierra 10.13.6 (17G65).
I'm getting the same thing. And when I try to reinstall it, the Java installer just bounces a few times and never opens a window. Never starts, unable to reinstall it.

I created another profile/account and used it after switching - and the apps that had been failing to start - never use any CPU - would work like they were supposed to.

By now it's pretty obvious something is not right in my home directory, but it's not being intuitive.