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JPA Mapping Of A HashMap Having A Enum Key

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  @ElementCollection
  @CollectionTable(name="table_name", joinColumns=@JoinColumn(name="owner_fk"))
  @MapKeyColumn(name = "name", length = 50, nullable = false)
  @MapKeyEnumerated(EnumType.STRING)
  @Column(name = "value", length = 100)
  private final Map metadata = new HashMap();
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