IntellijIDEA not recognizing classes specified in Maven dependencies

Question

I have a project in IntellijIDEA which was created with Maven. I then specified a set of dependencies and external repositories in the Pom.xml file.

The project builds

Answer 1

Restart, Invalid caches, outside building, none worked for me.

Only Reimport worked finally. For others sake, putting it as answer:

Right click the project > Maven > Reimport