I know of java.com/verity, but it only tells me the the version number of Java, e.g.
Your Java version: Version 8 Update 25
It does not tell me whether I have OpenJDK or Oracle installed. Is there another online service that does tell this?
Also Java tester
Also don't forget the terminal - Run in the terminal:
java -version
If you are using Firefox type about: Plugins. It will show your Java plugin being used:
java -version
in the terminal. The JVM run in the terminal is not necessarily the same as the one used by the browser, and in my case, they are different.
– Mads Skjern
Feb 8 '15 at 17:12