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
this works for me https://stackoverflow.com/questions/63521181/java-file-outside-of-source-root-intellij — yu yang Jian, Sep 09 '22 at 17:51

score 180 · Answer 1 · answered Feb 02 '17 at 12:45

180

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

3,011
2
15
25

15

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
3

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
2

I had it blue though but i marked it as Sources Root and it worked. Thanks! – user1769790 Nov 01 '18 at 19:27
4

This also helped me fix my tests! – ermish Dec 08 '18 at 16:54
2

you are a savior! – AnkitG Apr 07 '19 at 02:53
pycharm autocompletion instructions for numpy library -> https://www.youtube.com/watch?time_continue=420&v=qDEfvN7Du54&embeds_euri=https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dpycharm%2Bnew%2Blibrary%2Bto%2Bintellij%2Bpygame%26sxsrf%3DAPwXEdcidCzoMQJKMiEeLvRZd0c2pzLuEA%3A1680443695098%26so&feature=emb_logo – William Humphries Apr 02 '23 at 13:58
This appears to work for the source code that is in that directory, but any imported libraries (via gradle in my case) are still not getting recognized – James Wierzba Jul 28 '23 at 15:23

score 74 · Accepted Answer · edited Mar 25 '14 at 20:00

74

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

39,603
20
94
123

answered Mar 25 '14 at 14:57

CrystalVisions

864
7
4

2

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

score 9 · Answer 3 · answered Mar 07 '21 at 22:53

9

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

30,085
15
87
123

Thank you men works perfect (mac 12.6) – Bilal Oct 12 '22 at 14:21

score 7 · Answer 4 · 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

2,066
3
19
33

answered Dec 25 '14 at 10:34

Sergii Lisnychyi

477
4
10
16

score 6 · Answer 5 · 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 5 · Answer 6 · 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 7 · answered Feb 14 '18 at 07:32

4

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_

49
9

1

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
Thanks, in my case it was: https://plugins.jetbrains.com/plugin/15071-flutter-snippets – Jason Landbridge Feb 17 '23 at 08:31

score 4 · Answer 8 · 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 2 · Answer 9 · answered Jun 28 '18 at 11:06

2

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

answered Jun 28 '18 at 11:06

codemonkey

809
1
9
21

score 2 · Answer 10 · answered Aug 30 '18 at 03:28

2

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

1,774
17
15

1

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 1 · Answer 11 · edited Feb 01 '18 at 02:55

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.

edited Feb 01 '18 at 02:55

Stephen Rauch

47,830
31
106
135

answered Feb 01 '18 at 02:23

bob zhang

43
1
6

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

0

In IntelliJ 2017-2 to configure Autocompletion:

Settings -> Editor -> General -> Code Completion

answered Nov 19 '17 at 11:01

chrips

4,996
5
24
48

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

0

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

1,770
3
17
34

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

0

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

11,289
20
44
72

answered May 09 '20 at 16:59

Sami Haroon

869
10
14

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!

score 0 · Answer 18 · answered Sep 10 '22 at 02:10

0

I'm using Maven project, it works by:

File > Project Structure > Modules > Sources and then marked java files dir as Sources.

reference link.

answered Sep 10 '22 at 02:10

yu yang Jian

6,680
7
55
80

score 0 · Answer 19 · answered Dec 09 '22 at 18:52

0

Spent hours to fix this problem too. For me, the answer was to disable a plugin.

Which one to disable? Just find out using trial and error since all kinds of plugins can cause errors...

answered Dec 09 '22 at 18:52

Mart-Jan

47
10

1

This does not provide an answer to the question. Once you have sufficient [reputation](https://stackoverflow.com/help/whats-reputation) you will be able to [comment on any post](https://stackoverflow.com/help/privileges/comment); instead, [provide answers that don't require clarification from the asker](https://meta.stackexchange.com/questions/214173/why-do-i-need-50-reputation-to-comment-what-can-i-do-instead). - [From Review](/review/late-answers/33380473) – Soner Gönül Dec 15 '22 at 19:46

score 0 · Answer 20 · answered Feb 03 '23 at 08:57

0

It depends which product, for Intellij I might have to right click and import the .iml file from the root, or in Rider right click the solution file and open that. I'm only making this mistake 4 or 10 more times, and then it is never happening again.

answered Feb 03 '23 at 08:57

DeadlyChambers

5,217
4
44
61

score 0 · Answer 21 · answered May 25 '23 at 11:21

0

In my case plagin Lombok broke autocompletion.

Android Studio Flamingo 2022.2.1 Patch 2
Lombok 0.34.1-2019.1

answered May 25 '23 at 11:21

Maxim

213
3
9

score 0 · Answer 22 · answered Aug 30 '23 at 02:10

0

For me Right click on pom.xml and Add as Maven project

Maven pom.xml

answered Aug 30 '23 at 02:10

Vguttikonda

1

Intellisense in IntelliJ no longer working

22 Answers22

Linked

Related