Resource folders (src/main/resources, src/test/resources) are added to the project as source folders, even though they do not contain source. This has caused me problems as (a) not all resources are (by default) copied (you must update the compiler settings to tell it which resources should be copied) and (b) have to rely on a make/rebuild to copy files around. Adding the folders as moudle libraries, not source folders, makes sense as they contain no source files.