Java itself appears to be correctly installed
Code:
me@myPC:~$ java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) Server VM (build 25.111-b14, mixed mode)
WebHelps relying on jquery are running correctly in the browser

clicking on [Verify Java Version] at https://www.java.com/en/download/installed8.jsp does absolutely nothing, and I can't run the chat windows for my ISP that I vaguely remember as 'Java required'

What's to do?