@Entity annotations

I've just been scratching my head, attempting to figure out why some of my Java classes, marked with the @Entity annotation, weren't being generated (by Hibernate) as tables in my database.

They were correctly included in my hibernate.cfg.xml file with mappings:

<mapping class="mypackage.entity.myclass" />

However, while most of my classes were being correctly generated, some were not.

It turns out that in the classes which were failing, I'd accidently imported org.hibernate.annotations.Entity rather than the correct class (javax.persistence.Entity)

I guess this is a pretty easy trap to fall into - especially if you're using nice editor features (like the myEclipse "organize imports" plugin) and not paying sufficient attention (I did it once in a template and then copied this to a bunch of other locations!). Once done it can be kinda hard to see what isn't right .. Of course, the documentation is clear when it states:

"Note: @javax.persistence.Entity is still mandatory, @org.hibernate.annotations.Entity is not a replacement. "

Oooops...