To create DTO's (lighter object, that don't map the whole table/jointable of an object) it should be possible to map multiple entities to the same table.
This would be a very convenient way to create DTO's!

Right now it's not possible to create a schema like this due to the following exception:

Caused by: org.hibernate.DuplicateMappingException: Duplicate table mapping SubClass1

Could this become a warning instead of an exeception?
Or a @IgnoreDuplicateTableMapping annotation of some sort?

See also the following stackoverflow issue that goes into more detail:
http://stackoverflow.com/questions/30071394/data-transfer-object-dto-hibernate-duplicate-table-mapping