Safari 8 error: "...you need to install the Java Runtime Environment"

Question

Ever since upgrading to Yosemite and Safari 8, I continually get the error "To view this web content, you need to install the Java Runtime Environment" and, although I did do so the first time I got the error, and Java tells me I do have the latest version installed and running, I continue to get this error constantly.
Is there a way to stop this, or at least find out what content is causing it? I can't put my finger on any particular content that causes the error.

Answer 1

This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
java -version
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
If the Apple Java runtime is installed and up to date, you should get three lines of output below what you entered, the first of which is this:
java version "1.6.0_65"
Is that what you get? You can then quit Terminal.