estructura de árbol JPA
@Entity
@Table(name = "node")
public class Node {
@Id
@Column(name = "id")
private String id;
@Column(name = "name")
private String name;
@Column(name = "parent_id")
private String parentId;
@OneToMany(fetch = FetchType.EAGER)
@JoinColumn(name = "parent_id", referencedColumnName = "id")
private Set<Node> childNodes;
}
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