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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?
Try Java Plugin detector
Also Java tester
Also don't forget the terminal -
Run in the terminal:
If you are using Firefox type about: Plugins.
It will show your Java plugin being used:
Required, but never shown