I was trying to resolve a problem in my eclipse so I clicked on :
Propreties -> Project Facets -> Click on the link
Now I have a new
Here is how to turn off Eclipse facets which gave me a few problems with the Spring related to drivers, something like "cannot establish a connection".
Right click project -> Project Natures -> search for 'Eclipse faceted Project Properties' -> Remove -> Apply and close.
This is related: also when you click Update Maven project and it regains the warning or problems which you've fixed before, then I think it is because of incompatibilities between the versions of Dynamic Web, Java and so on, with versions from maven dependency.