@Entity
@Table(name = "URL")
public class UrlEntity implements Url, Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(generator = "SEQ_URL")
	@SequenceGenerator(name="SEQ_URL", sequenceName="SEQ_URL", allocationSize = 1)
	private Long id;

	private String url;

	@OneToMany(targetEntity = RoleEntity.class, fetch = FetchType.EAGER)
	private Set<Role> roles;

@Entity
@Table(name = "ROLE")
public class RoleEntity implements Role, Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(generator = "SEQ_ROLE")
	@SequenceGenerator(name = "SEQ_ROLE", sequenceName="SEQ_ROLE", allocationSize = 1)
	private Long id;

	private String name;

	private String description;

	@AttributeOverride(name = "url_id", column = @Column(name = "urlentity_id")) 
	@OneToMany(targetEntity = RoleEntity.class, fetch = FetchType.EAGER)
	private Set<Role> roles;

alter table url_role rename column url_id to urlentity_id;

	@JoinColumn(name = "urlentity_id") 
	@OneToMany(targetEntity = RoleEntity.class, fetch = FetchType.EAGER)
	private Set<Role> roles;

@JoinTable(name = "STUDENT_PHONE", joinColumns = { @JoinColumn(name = "STUDENT_ID") }, inverseJoinColumns = { @JoinColumn(name = "PHONE_ID") })

@JoinTable(name = "URL_ROLE", joinColumns = { @JoinColumn(name = "URLENTITY_ID") }, inverseJoinColumns = { @JoinColumn(name = "ROLES_ID") })
@OneToMany(targetEntity = RoleEntity.class, fetch = FetchType.EAGER)
private Set<Role> roles;