What are derived files in Eclipse?

Question

I have problem with derived files. Some of my files in my project are \'derived\'. When I want to edit these files, I get the following message:

"This f

Answer 1

I just had this problem, I accidentally dragged and dropped a package into the gen folder. This set a flag on the package as derived. When I copied back it still existed, and affected all the sub files.

I just right click on package, properties and unticked Derived, and problem solved.