JPA Cannot resolve column/IntelliJ

You have to associate your data source (create a data source in database view first – aka your real JDBC database connection) with a persistence unit or session factory (hibernate.cfg.xml).

Follow below steps and the warnings will disappear:

1. Open the Persistence tool window (View | Tool Windows |
   Persistence).
2. Right-click the necessary module, persistence unit or
   session factory, and select Assign Data Sources in the context menu.
3. In the Assign Data Sources dialog that opens, click the Data Source
   field and select the necessary data source. (To remove the
   association with the data source, select none.)

See here: Associating data sources with session factories and persistence units