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JPA Annotation MapKeyEnumerated Target: METHOD, FIELD Implemented Interfaces: Annotation Specifies the enum type for a map key whose basic type is an enumerated type. The MapKeyEnumerated annotation ... specified or the MapKeyEnumerated annotation is not used, the enumerated type is assumed to be ORDINAL

JPA Annotation Attribute in jakarta.persistence. MapKeyEnumerated EnumType value default EnumType.ORDINAL (Optional) The type used in mapping a map key enum type. Since: JPA 2.0

) @ MapKeyEnumerated (EnumType.STRING)     private Map states = new HashMap (); } @Entity ... = FetchType.EAGER, cascade=CascadeType.ALL, orphanRemoval=true) @MapKey(name="state") @ MapKeyEnumerated ... that class in mappedBy and the key field, e.g. using MapKeyEnumerated . Otherwise ObjectDB will not