how to save enum value to DB with Hibernate?

Use this annotation at field level:

@Enumerated(EnumType.STRING)

You can add following enumeration, to indicate you want the String representation to be persisted :

@Enumerated(EnumType.STRING)
private ApartmentState apartmentState;

I also had to add

@Embeddable to the java enum

@Embeddable
 public enum ApartmentState {
        FREE, REQUESTED, BOOKED, LIVED, CLEANING, PROCESSING
    }

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