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?

Possible duplicate of [IntelliJ does not show 'Class' when we right click and select 'New'](https://stackoverflow.com/questions/18852425/intellij-does-not-show-class-when-we-right-click-and-select-new) — kelin, Jun 26 '17 at 19:59

score 164 · Answer 1 · answered Feb 02 '17 at 12:45

164

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.

answered Feb 02 '17 at 12:45

Loaf

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This helped in my case! For some reason IntelliJ didn't even offer completion for the standard library classes before I did that. – quezak Feb 07 '17 at 22:14
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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 ;) – Li3ro Jul 24 '18 at 12:17
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I had it blue though but i marked it as Sources Root and it worked. Thanks! – user1769790 Nov 01 '18 at 19:27
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This also helped me fix my tests! – ermish Dec 08 '18 at 16:54
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you are a savior! – AnkitG Apr 07 '19 at 02:53

score 70 · Accepted Answer · edited Mar 25 '14 at 20:00

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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.

edited Mar 25 '14 at 20:00

Andrew Barber

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answered Mar 25 '14 at 14:57

CrystalVisions

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Thanks!! File/Power Save Mode was turned on somehow. I unchecked this and all the wonderful features of working in an IDE returned. – earthling Mar 25 '14 at 18:11
You saved my date! – tugceaktepe Dec 15 '21 at 08:15

score 7 · Answer 3 · edited Jun 21 '18 at 07:11

7

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

edited Jun 21 '18 at 07:11

Ashu

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answered Dec 25 '14 at 10:34

Sergii Lisnychyi

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score 5 · Answer 4 · answered Apr 19 '17 at 07:10

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. :)

score 4 · Answer 5 · answered Oct 02 '18 at 06:24

Had the same problem and none of these helped. What I realized was that on mac, control + space is used by the OS to change language inputs and it overrides intellij. So if you are on mac having multiple input languages on your keyboard, consider changing the shortcut for it :)

score 4 · Answer 6 · answered Mar 07 '21 at 22:53

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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:

answered Mar 07 '21 at 22:53

Federico Piazza

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score 2 · Answer 7 · edited Oct 18 '21 at 00:13

I tried all the above option and it did not solve the issue. In my case:

THE ISSUE: node_modules was not loaded in the file structure of the project.

THE SOLUTION: go to explorer(finder/nautilus) find the .idea folder in the project and delete it. Then re-import the project. Once I re imported the project it loaded the node_modules folder as library root

Note: It will take a few seconds for IntelliJ to index all the libraries. You will see a loader on the bottom right next to line number info.

score 2 · Answer 8 · answered Feb 14 '18 at 07:32

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Try disabling all plugins you have. I installed Codota and it turns out to be garbage. I uninstalled it and disabled the plugin in IntelliJ and it worked

answered Feb 14 '18 at 07:32

mdeligt_

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I added `_ideavimrc` took from github. It's key binds has overridden in my case. – s1n7ax Mar 03 '19 at 17:23
@s1n7ax it was exactly this in my case. I added another answer for that! Thanks! – ifnotak Jun 09 '20 at 11:23

score 1 · Answer 9 · edited Feb 01 '18 at 02:55

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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.

edited Feb 01 '18 at 02:55

Stephen Rauch

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answered Feb 01 '18 at 02:23

bob zhang

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score 1 · Answer 10 · answered Jun 28 '18 at 11:06

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In my case, I restarted the Intellij and everything came back to normal.

answered Jun 28 '18 at 11:06

codemonkey

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score 1 · Answer 11 · answered Aug 30 '18 at 03:28

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Had the same problem until:

Third party JDK installed
Configured in module settings: right click on project name, then "Open module settings" -> SDKs -> "+". Pick the jdk root folder and Idea will take care of the rest.
Re-indexed a bunch of things. It happens automatically, just be patient

answered Aug 30 '18 at 03:28

vizmi

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I was using the JDK that came with intellij. Once I switched to another JDK, like openJdk, autocompletion started working again. – BigRedBettaFish May 07 '20 at 21:35

score 0 · Answer 12 · answered Nov 19 '17 at 11:01

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In IntelliJ 2017-2 to configure Autocompletion:

Settings -> Editor -> General -> Code Completion

answered Nov 19 '17 at 11:01

chrips

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score 0 · Answer 13 · answered Oct 01 '18 at 14:27

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In case this helps anyone; for me it was a windowing glitch of some kind. The suggestions popup showed on the wrong monitor, which I didn't notice the first time it happened.. after a while I saw what was happening. Resizing the window seemed to fix it.

answered Oct 01 '18 at 14:27

Jochem Kuijpers

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score 0 · Answer 14 · answered Mar 11 '19 at 09:26

If you're too lazy to restart your machine to fix the issue, you can kill the process taskkill /F /PID pid_number_of_idea64.exe (task manager -- view>select columns>PID) and then open CMD, head over to C:\Program Files\JetBrains\IntelliJ IDEA xxxx.xx.xx\bin, start idea.bat. Let this CMD window open. Please note that even after executing taskkill, idea64.exe process doesn't disappear from task manager. Try executing the same command again and you'd know that process doesn't exist anymore.

score 0 · Answer 15 · answered Nov 07 '19 at 07:46

For me the code completion suddenly stopped working because I had nudged the IDEA window slightly off-screen, maybe just a pixel or two, which caused the code completion pop-up to (presumably) appear off-screen. Making sure the application window was fully visible fixed the problem.

score 0 · Answer 16 · edited Oct 18 '21 at 00:13

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IMPORTANT

If you had your email logged-in on IntelliJ Idea for a while and its token expire the Intellij will suddenly stop working or crash(My Version 2020.1.1).

Do two things.

1. file > sync settings with JetBrains account (log in here)
enter code here.
2. file > Invalidate cache / restart

edited Oct 18 '21 at 00:13

bad_coder

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answered May 09 '20 at 16:59

Sami Haroon

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score 0 · Answer 17 · answered Jun 09 '20 at 11:21

In case none of these work for you, if you are using IdeaVim, make sure your ~/.ideavimrc does not override Ctrl+Space, you can check this in vim:

:verbose map <c-space>

In my case, it was set by ~/.vim_runtime:

Last set from ~/.vim_runtime/vimrcs/basic.vim line 208

Thanks @s1n7ax for the tip!

Intellisense in IntelliJ no longer working

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