Вытянуть дерево из таблицы

@Entity
@Table(name = "Department", schema = "dbo", catalog = "mydb")
public class Department implements java.io.Serializable {
 
    private short dptId;
    private Department department;
    private String dptName;
    private String dptAdr;
    private Set<Department> departments = new HashSet<Department>(0);
    private Set<Employee> employees = new HashSet<Employee>(0);
 
    public Department() {
    }
 
    public Department(short dptId, String dptName, String dptAdr) {
        this.dptId = dptId;
        this.dptName = dptName;
        this.dptAdr = dptAdr;
    }
 
    public Department(short dptId, Department department, String dptName,
                      String dptAdr, Set<Department> departments, Set<Employee> employees) {
        this.dptId = dptId;
        this.department = department;
        this.dptName = dptName;
        this.dptAdr = dptAdr;
        this.departments = departments;
        this.employees = employees;
    }
 
    @Id
    @GeneratedValue(generator="increment")
    @GenericGenerator(name="increment", strategy = "increment")
    @Column(name = "DPT_ID", unique = true, nullable = false)
    public short getDptId() {
        return this.dptId;
    }
 
    public void setDptId(short dptId) {
        this.dptId = dptId;
    }
 
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "Dep_DPT_ID")
    public Department getDepartment() {
        return this.department;
    }
 
    public void setDepartment(Department department) {
        this.department = department;
    }
 
    @Column(name = "DPT_NAME", nullable = false, length = 35)
    public String getDptName() {
        return this.dptName;
    }
 
    public void setDptName(String dptName) {
        this.dptName = dptName;
    }
 
    @Column(name = "DPT_ADR", nullable = false, length = 150)
    public String getDptAdr() {
        return this.dptAdr;
    }
 
    public void setDptAdr(String dptAdr) {
        this.dptAdr = dptAdr;
    }
 
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "department")
    public Set<Department> getDepartments() {
        return this.departments;
    }
 
    public void setDepartments(Set<Department> departments) {
        this.departments = departments;
    }
 
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "department")
    public Set<Employee> getEmployees() {
        return this.employees;
    }
 
    public void setEmployees(Set<Employee> employees) {
        this.employees = employees;
    }
 
}

 @PostConstruct
    public void init() {
 
        List<TestTable> idOrgan = dm.find(new KlTestTableBuilder(dm.getEntityManager()).pid.isNull().build());
        idOrgan.size();
 
        root = new DefaultTreeNode("ОРГАН", null);
        for (int i = 0; i < idOrgan.size(); i++) {
            List<WwwOrgans> Organ = dm.find(new KlOrgansBuilder(dm.getEntityManager()).organId.equal(idOrgan.get(i).getId()).build());
            Organ.size();
            TreeNode node1 = new DefaultTreeNode(Organ.get(0).getOrganName(), root);
            Node(node1, idOrgan.get(i).getId());
 
        }
 
    }
 
    private void Node(TreeNode node2, BigDecimal id) {
        List<TestTable> idOrgan = dm.find(new KlTestTableBuilder(dm.getEntityManager()).pid.equal(id).build());
        idOrgan.size();
        if (idOrgan != null) {
            for (int i = 0; i < idOrgan.size(); i++) {
                List<WwwOrgans> Organ = dm.find(new KlOrgansBuilder(dm.getEntityManager()).organId.equal(idOrgan.get(i).getId()).build());
                Organ.size();
                TreeNode node3 = new DefaultTreeNode(Organ.get(0).getOrganName(), node2);
                Node(node3, idOrgan.get(i).getId());
            }
        }
    }