Eclipse: The resource is not on the build path of a Java project

I am trying to set up a dynamic web project using Eclipse and its Maven plugin. I am selecting maven-archetype-webapp and am facing the same problem (which I run into when trying to automatically produce getters and setters for some attributes).

My way around this was to right-click on the project, select Build Path --> Configure Build Path and then remove a weird exclusion filter "Excluded:**" which I found under the entry /src/main/resources.

You can add the src folder to build path by:

1. Select Java perspective.
2. Right click on src folder.
3. Select Build Path > Use a source folder.

And you are done. Hope this help.

EDIT: Refer to the Eclipse documentation