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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

JPA Annotation MapKey Target: METHOD, FIELD Implemented Interfaces: Annotation Specifies the map ... associated with it. The MapKeyClass annotation is not used when MapKey is specified and vice versa. Example 1: @Entity public class Department { ... @OneToMany(mappedBy="department") @ MapKey // map key

JPA Annotation Attribute in javax.persistence. MapKey String name default "" (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

= 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   

annotations ( OneToMany or ManyToMany ). The MapKey annotation is not used when MapKeyClass is specified

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