java - Spring Data JPA(Hibernate): How do I retrieve a concrete entity using only a field in its abstract superclass? - Stack Overflow

java - Spring Data JPA(Hibernate): How do I retrieve a concrete entity using only a field in its abstract superclass? - Stack Overflow

It seems you didn't specify a discriminator explicitly for your widget hierarchy. I think you can try to define it explicitly because Spring Data will manipulate bytecode to generate the queries, and so I suspect SpringData need to have those values explicitely defined.

Additionally in subclasses you need to indicate the discriminator value for each subclass.

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