MapKeyJoinColumns (persistence-api 2.2.4 API)

```
@Target(FIELD)
@Retention(RUNTIME)
public @interface MapKeyJoinColumns
```
Supports composite map keys that reference entities.
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.

Since:

Java Persistence 2.0

See Also:

MapKeyJoinColumn

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  MapKeyJoinColumn[] value
  (Required) The map key join columns that are used to map to the entity that is the map key.
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  ForeignKey foreignKey
  (Optional) The foreign key constraint specification for the join columns.

- Element Detail
  - value
```
MapKeyJoinColumn[] value
```
    (Required) The map key join columns that are used to map to the entity that is the map key.
    
    Returns:
    
    The join cols
- - foreignKey
```
ForeignKey foreignKey
```
    (Optional) The foreign key constraint specification for the join columns. This is used only if table generation is in effect. Default is provider defined.
    
    Returns:
    
    The foreign key specification
    
    Default:
    
    @javax.persistence.ForeignKey