Java: Eclipse does not recognize the source folder

Question

I don't know what happened, but suddenly Eclipse does not recognize the source folders of all my projects as source any more.

Eclipse treats it like a normal folder, like config e.g.

Can you help me with my problem?

Thanks for your help!!

Answer 1

You have changed the View (probably you're on the Navigator one).

Navigate to Window → Show View → Package Explorer and then the Package Explorer view, which marks every source folder with a special icon, will be opened.