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Jakarta Persistence (JPA) Annotation Type jakarta.persistence. MapKey Implemented Interfaces ... when MapKey is specified and vice versa. Example 1: @Entity public class Department { ... @OneToMany(mappedBy = "department") @ MapKey // map key is primary key public Map getEmployees() {... } ... } @Entity

Jakarta Persistence (JPA) Method in jakarta.persistence. MapKey String name (Optional) The name of the persistent field or property of the associated entity that is used as the map key. Default: If the name element is not specified, the primary key of the associated entity is used as the map key

from the inverse query results by specifying a selected key field using the MapKey annotation: @Entity public class Department { @OneToMany ( mappedBy ="department") @ MapKey ( name ="name") Map

one of the collection-valued relationship annotations ( OneToMany or ManyToMany ). The MapKey annotation

= FetchType.EAGER, cascade=CascadeType.ALL, orphanRemoval=true) @ MapKey (name="state") @MapKeyEnumerated ... ? But I have to set "@ MapKey "? Or is this optional? itsme Martin Petzold You have 2 options: Not using ... ;further information is needed  by ObjectDB (so it should work also without specifying @ MapKey

.persistence.Id; import javax.persistence.ManyToOne; import javax.persistence. MapKey ; import javax ... ", orphanRemoval = true)   @ MapKey (name = "childName")   private Map children = new HashMap ();  

.persistence. MapKey ; import javax.persistence.OneToMany; import javax.persistence.Persistence; import javax ... , cascade = CascadeType.ALL, mappedBy = "parent", orphanRemoval = true)   @ MapKey (name = "childName

String code;     @OneToMany(mappedBy = "user") @ MapKey     private Map ... code;         @OneToMany(mappedBy = "project") @ MapKey   

as follows; @OneToMany(cascade=CascadeType.ALL, mappedBy="z_component") @ MapKey (name="z_schemeName ... (cascade=CascadeType.ALL, mappedBy="z_aqera") @ MapKey (name="z_registerId")     private