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@Entity
@Table(name = "ExampleMap")
@Data
@EqualsAndHashCode
public class JpaExampleMap implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @ElementCollection
    @Lob
    private Map<@NotNull String, @NotNull String> attributes;
}