I’m not sure what you mean by “reversed on appeal” as the stop() methods did make it into the platform. But there’s also Thread.destroy() whose API was defined

I’m not sure what you mean by “reversed on appeal” as the stop() methods did make it into the platform. But there’s also Thread.destroy() whose API was defined but which I think was never actually implemented. (Fortunately.) Edit: FWIW, I looked through the history, and it looks like Thread.destroy() was added by Bill Joy in Aug 1995. The initial implementation was "throw new NoSuchMethodError();".