Hello,

This issue seems to be caused by a typo in my mapping files. I had an hierary as

Tiger extends Cat extends Animal

It Should have been: Everything as Joined-Subclass, Animal and Cat using abstract=”true” and Tiger with abstract=”false” .

It was: Animal and Tiger had abstract=”true” and Cat had abstract=”false”.

Somehow this did not cause any issues in 61.5 and 6.1.6… I guess this is an invalid mapping state which can only be archieved using legacy hibernate mapping files.

Best regards,

Thorsten