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 explicitly invoke code completion using ctrl+space. I looked in Settings->Editor->Code Completion and nothing looks out of place. Is there somewhere else that turns this feature on/off?

Solution 1

Check to see if you accidentally turned on Power Save (File/Power Save Mode) I myself just discovered that File/Power Save Mode does turn it off. I was having the same problem and must have accidentally set Power Save Mode to on.

Solution 2

For me it was because I did not have a folder marked as Source Root (it appears in blue).

To fix, right click your root source directory -> Mark As -> Source Root.

Solution 3

File -> Settings-> Editor-> General -> Code Completion-> Auto pop up code Completion

Solution 4

If other options mentioned is already true for you,try Setting up Sources/Test folder as Sources Root/Test Sources root as it did the trick for me. I had forgot it.

Right click on folder, choose "Mark Directory as" Test Sources or Sources Root, or whatever applicable. :)

Solution 5

I'm using Mac and when I upgraded to Big Sur my intellisense stopped working.

This is due Big Sur has a shortcut for Input Source. By disabling Mac shortcut, will make Intellisense work again.

You can see the option to disable in mac:

View more solutions

Comments

[earthling]

Thanks!! File/Power Save Mode was turned on somehow. I unchecked this and all the wonderful features of working in an IDE returned.

[quezak]

This helped in my case! For some reason IntelliJ didn't even offer completion for the standard library classes before I did that.

[Li3ro]

In my case, It was blue(!) and still showed lots or red lines in my perfect code. To fix, I had to unmark and then mark- fixed it ;)

[user1769790]

I had it blue though but i marked it as Sources Root and it worked. Thanks!

[ermish]

This also helped me fix my tests!

[s1n7ax]

I added _ideavimrc took from github. It's key binds has overridden in my case.

[AnkitG]

you are a savior!

[BigRedBettaFish]

I was using the JDK that came with intellij. Once I switched to another JDK, like openJdk, autocompletion started working again.

[ifnotak]

@s1n7ax it was exactly this in my case. I added another answer for that! Thanks!

[tugceaktepe]

You saved my date!