Define a OneToMany association in a MappedSuperclass when using Hibernate

Issue

• A MappedSuperclass (e.g. Employee) is defined as the parent of multiple subclasses.
• The inheritance hierarchy rooted at the MappedSuperclass has a OneToMany association with a list/set of related entities (e.g. Task).

• If mappedBy is used in the OneToMany declaration and the ManyToOne references the MappedSuperclass an exception is raised during deployment (where Employee is the MappedSuperclass referenced by a ManyToOne in Task):

  org.hibernate.AnnotationException: @OneToOne or @ManyToOne on support.hibernate.entity.Task.employee references an unknown entity: support.hibernate.entity.Employee
      at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:97)
      ...
      at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1246)
      ...