How to attach source or JavaDoc in eclipse for any jar file e.g. JavaFX?

Question

Presently I\'m working with JavaFX. Whenever I hover over a method of JavaFX its gives me the following error:

\'Note: This element neither has attached sourc

Answer 1

It already in a different thread, just a simple eclipse setting will automatically download JavaDoc (but, you need to click the method for first time).

Where can I download the JavaDoc for JPA 2.0?