Combination of

1. @Entity abstract class ABlockableEntity
2. @OneToOne(fetch=FetchType.LAZY)
   @JoinTable(
   name="QUEUE",
   joinColumns=
   @JoinColumn(name="child_id", referencedColumnName="id"),
   inverseJoinColumns=
   @JoinColumn(name="parent_id", referencedColumnName="id"))
   private ABlockableEntity parentId;

is failed on childs of ABlockableEntity.

Try sample project at https://github.com/qwazer/jpa_one2one_bug_report

test EventRepositoryTest failed
but tests with simple entities without inheritance are OK