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();
Data structure
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