A fellow developer dislikes the Eclipse hovering Javadoc and would like to disable it (one option), or, better yet, only selectively enable it (other option). He\'s using Eclip
You could go to
Preferences / Java / Editor / Hover
and untick the "Combined Hover" option: no more popup.
Then you would have:
Shift+F2: open the external javadoc if javadoc archive or directory has been associated with your project (and if some javadoc has been generated)
Alt+Shift+Q, followed by J: open the javadoc view, with the same content than the popup previously seen on mouse hovering.