IntelliJ Code Completion not working for new Java classes

Question

IntelliJ IDEA 13 has started exhibiting a very weird behavior in my local setup.

Namely, in any new Java class added to an existing project

Answer 1

I am using IntelliJ Ultimate 2017.1, and I encountered similar issue. Maven project, was trying to using selenium APIs, but the intellisense didn't pop up relative methods for me.

Here is the way I solved my issue:

Right click on your project src folder
Choose Mark Directory As Then select Sources Root

Answer 2

Ensure that you are not in Power Save Mode while running IntelliJ (File [menu] -> Power Save Mode checked or not). If Power Save Mode is enabled, IntelliJ will not run background tasks, including code completion.

Answer 3

Cut the folder .idea and the files *.iml in the root folder and paste somewhere else out of project. when you re-open the project , auto import will work again magically.

Answer 4

I had similar problem, nothing in this topic helped.

So finally I made it work, I clear cache of IntelliJ and restart.

File > Invalidate Caches / Restart.. > Invalidate Cache and Restart (button)