Missing basic JavaDoc in Eclipse

Question

Up to a few days ago, Eclipse was working fine in locating the javadoc for base classes such as Java.io.File. Recently, though, hovering over these classes only yields a message

Answer 1

Press ctrl+click (or command+click if you're on a Mac) on any method which doesn't have javadocs. For example, in this line:

System.out.println();

... assuming that no javadocs are available for println, control-clicking on println will open a new tab with a button labeled "Attach Source...". And that's it!