“Faceted Project Problem (Java Version Mismatch)” error message

Question

Eclipse\'s \"problems\" tab is displaying this error:

Description: Java compiler level does not match the version of the installed Java project facet.

Answer 1

The project facets should be derived automagically by the M2Eclipse plugin from the POM configuration. If you make some changes to the POM and need Eclipse to take them into account, right-click on your project, then go to Maven > Update Project Configuration. You should not set project facets manually.