@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface MapKeyJoinColumns
 The MapKeyJoinColumns annotation groups
 MapKeyJoinColumn annotations.  When the
 MapKeyJoinColumns annotation is used, both the
 name and the referencedColumnName
 elements must be specified in each of the grouped
 MapKeyJoinColumn annotations.
MapKeyJoinColumn, 
ForeignKey| Modifier and Type | Required Element and Description | 
|---|---|
| MapKeyJoinColumn[] | value(Required) The map key join columns that are used to map to the entity
 that is the map key. | 
| Modifier and Type | Optional Element and Description | 
|---|---|
| ForeignKey | foreignKey(Optional) Used to specify or control the generation of a
  foreign key constraint when table generation is in effect. | 
public abstract MapKeyJoinColumn[] value
public abstract ForeignKey foreignKey
foreignKey
  element of any of the MapKeyJoinColumn
  elements are specified, the behavior is undefined.  If no
  foreign key annotation element is specified in either
  location, the persistence provider's default foreign key
  strategy will apply.Copyright © 2017. All Rights Reserved.