IntelliJ can't find classes in same package when compiling

Question

As an extension to my previous question (IntelliJ can't find depencency when compiling, but can in editor.) which got solved, I now have a new issue which has sprung up.

Within the same packages, references to other classes are showing up with errors:

As you can see in the picture, there is happening at the line involving the BifCreatorController, even though that class is in the same package as the BifCreatorView.

Just like my previous question, I am failing to understand why IntellJ is spitting out those errors. This project works just fine in Eclipse, but I am looking to start moving away from eclipse.

Saunders

Answer 1

This is because BifCreatorController is excluded from compilation (see the small "X" top-left icon near to the file name). One reason would be the file got some errors while compiling, IDEA proposed to exclude it from compilation and you had accepted.

Go to "File > Settings > Build, Execution, Deployment > Compiler > Excludes" and remove it from there.

Outplay

Awesome! And wow, I had no idea IntelliJ would do that exclude. I feel pretty strongly it should have given me some kind of warning/info message about this. Oh well... Once I learn IntellJ more, perhaps I'll be able to predict issues like this. Thanks – Saunders

:) You just need some time getting accustomed to it, and btw if you're an Eclipse user, you may find this migration guide (from IntelliJ official site) valuable: jetbrains.com/idea/help/eclipse.html – Outplay

Answer 2

Got same problem today. Rebuilding or restarting both didn't work for me. In the end, I tried to rename the class, problem solved! Then I rename the class to the name I want, everthing was fine!

Chemosmosis

Since it happens very rarely, this is a nice solution that worked perfectly for me. – Laspisa

So I was like how is this going to work. I went to the class just typed something random and then deleted the random text and it indexed the class???? I have no idea how or why. I literally did invalidate cache and restart which normally works but it did not work today. This worked and I'm forever thankful to you. – Ruination

Legendary. Just resolved an hour of head-pounding and frustration after 2 restarts with no success – Kowalczyk

Renaming the class and renaming again back to original one did the trick. Thanks! – Abramson

Works with "missing" interfaces as well. – Vantage

Answer 3

I had the same problem, i cleared the cache and restarted but it did not solve the problem. Then i right clicked the not found class and selected Recompile and after recompilation the problem was solved.

Unconventionality

Answer 4

For those who can't beat the trouble i suggest switching to maven because it's predictive:

Maven > Runner > Delegate IDE build/run actions to Maven

Facing

The screenshot suggests that this is not a maven project. Delegating to maven thus cannot be a solution. – Minnick

in my case this is the ONLY silver bullet for intellij idea version i'm allowed to install. – Facing

only this method worked! Thanks – Oaks

Answer 5

Another reason is the cache problem.

Go to -> File -> Invalidate Caches / Restart ...

Hennessey

Answer 6

Thanks to @liuyong for the tip. In my case it happened with A LOT of classes, so renaming all of them would have been a bit cumbersome.

Then I decided to rename the base package (I just added a letter at the end), compiled the code and then renamed back to the original one.

It worked here too. The problem didn't happen again when switching branches.

Allieallied

Answer 7

Nothing else worked for me, but this fixed it

Build -> Rebuild Project

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