Intellisense in IntelliJ no longer working

Question

I\'m currently running IntelliJ IDEA 13.1. While running IntelliJ 13 intellisense/autocomplete stopped working. I tried upgrading and it still doesn\'t work.

I can e

Answer 1

For me, it was I hadn't yet set up the JDK.

Type something out, Ctrl+Space to try to autocomplete. If it fails, do Alt+Space and if the option comes up to setup JDK, do that.