IDEA JetBrains IntelliJ - Compile error on 'make' but fine when compiled using Maven and no errors reported by IntelliJ in the class file

I found out that this might help:

File -> Invalidate Caches

Maven Projects -> Reimport should help.

I spent a few hours on this same issue. All of the cleans in the world didn't help.

I deleted my out and target directory in my project and recompiled - that cleared it.

Edit: There is also a magic feature under the file menu: "Invalidate Caches / Restart" This fixes a bunch of "intellij is confused" problems.