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 had this same problem and it was caused by me not having a folder marked as sources root.

Right click on your src directory and Mark Directory As > Sources Root.

Answer 2

It helped me to mark the src directory as the "Source Root".

Answer 3

Remove your package from the Settings>Editor>General>Auto Import>Java>Exclude from Import and Completion

I had run into this problem. None of the solutions from this post worked, but I was able to fix it because I accidentally put my project's package in the "Exclude from Import and Completion" settings.

Answer 4

There could be 2 reasons for your problem

1. Either the the source folder is not properly configured in the your build java build path. If the source folder is not properly configured the autocomplete wont get the required class definitions and autocomplete would fail for your project.
2. Restoring the default options in 'Windows > Preferences > Java > Editor > Content Assist > Advanced'

Answer 5

Make sure you mark all your Source directories as such in File -> Project Structure -> Modules.

Answer 6

It was happening for me in a module that was not added in the parent project pom (they did it on purpose), that was the reason, I right clicked the pom.xml of the module that has the issue and clicked the

now the autocomplete came and in addition to that I can see the module as a separate project in the maven tab on the top right.