If you have an older Spring Roo project created from Spring Roo 1.1.x and you’re trying to imported it to a more recent STS version and/or trying to upgrade to a later 1.2.x version of Spring Roo, you may be seeing these errors:
RooEntity cannot be resolved to a type
@RooEntity was replaced in Spring Roo 1.2.x with @RooJpaActiveRecord. Replace this in all your Entity classes and you should be good to go.
This is discussed in this thread.
@RooJpaActiveRecord is covered in the docs here.