I don\'t know what happened but the intellisense just disappeared; how to get it back? I tried creating new projects, rebooting, doesn\'t help.
Did you reset the preferences of default options in 'Windows > Preferences > Java > Editor > Content Assist > Advanced', like mentioned in this answer?
Windows > Preferences > Java > Editor > Content Assist > Advanced
window -> preferences -> editor -> content assist
and check the completion inserts box