Hibernate JPA @MapKeyJoinColumns Example

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@MapKeyJoinColumns

The @MapKeyJoinColumns annotation is used to group several @MapKeyJoinColumn mappings when the java.util.Map association key uses a composite identifier.

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.

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