Hibernate JPA @MapKeyType Example

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@MapKeyType

The @MapKeyType annotation is used to specify the map key type.

MapKeyType
Allows defining the type of the key of a persistent map.

@MapKeyType mapping example

@Entity
@Table(name = "person")
public static class Person {

 @Id
private Long id;

 @ElementCollection
@CollectionTable(
name = "call_register",
joinColumns = @JoinColumn(name = "person_id")
)
@MapKeyType(
@Type(
type = "org.hibernate.userguide.collections.type.TimestampEpochType"
)
)
@MapKeyColumn( name = "call_timestamp_epoch" )
@Column(name = "phone_number")
private Map<Date, Integer> callRegister = new HashMap<>();

 //Getters and setters are omitted for brevity

 }

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