No code completion for Maven dependency

IntelliJ does not give any suggestions from the Java dependency in my project's pom.xml.

Things I've tried:

- Updating http://repo.maven.apache.org/maven2

- Invalidate Cache and Restart: this is interesting because right after restart when the IntelliJ is still indexing, the code completion now gives suggestions from the Maven dependency, but after IntelliJ finishes indexing they disappear again.