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kotlinlang

Mmmm, try to add `@org.springframework.transaction.annotation.Transactional` on the `update` fun.

Explanation: You probably have something lazily initialized in your entity, you're getting it from the repository and then saving it back.
Without `@Transactional` Spring Data finishes the transaction at repository method, so the `UserDao` entity is a POJO instead of managed bean.
The lazily initialized stuff is therefore just empty and when you save `UserDao` you're effectively deleting all that stuff.
If, on the other hand, the function is annotated with `@Transactional`, then both query and save operations happen in the same transaction and `UserDao` is a managed entity in-between.

I see @Transactional is already added in the service class, for update()

It was missing in the screenshot. If it's there in the code, then no idea.
Can you post full stacktrace?
And I'd be greatful if you didn't use mentions unless absolutely necessary :slightly_smiling_face: