Consider:

@Entity
public class A
{
@Id
@GeneratedValue
protected int id;

@OneToMany(mappedBy = "a")
protected Collection<C> c;
}

@Entity
public abstract class B
{
@Id
@GeneratedValue
protected int id;

@ManyToOne
protected A a;
}

@Entity
public class C
extends B
{
}

Gives the following errors upon deployment:

Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.gd.iewtpt.isi.C.a in com.gd.iewtpt.isi.A.c
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:552)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:517)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:316)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1115)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1269)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:150)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:888)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:186)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:246)
... 7 more

I can get around this issue, but it seems there is a bug here...