Entidades relacionadas não carrega quando chamada no spring boot

Programação
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#1

Eae galera, estou com um problema quando tento referenciar a entidade UserRole, quando dou um getUserRoles(), ela mostrar com o tipo persistentbag e retorna um erro de inicialização do hibernate, ja tentei usar o hibernate.initialize porem não deu certo.

User.java

@Entity
@Table(name = "SFT_USER")
public class User extends AbstractEntity {

    @Id
    @SequenceGenerator(name="id_seq_sft_user", sequenceName = "seq_sft_user", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_seq_sft_user")
    private Long id;

    @NotEmpty(message = "Name is required")
    @Column(name = "NAME")
    private String name;

    @NotEmpty(message = "Login is required")
    @Column(name = "USERNAME", unique = true)
    private String username;

    @NotEmpty(message = "E-mail is required")
    @Column(name = "EMAIL")
    private String email;

    @NotEmpty(message = "Password is required")
    @JsonIgnore
    @Column(name = "PASSWORD")
    private String password;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "user")
    private List<UserRole> userRoles;

    ... Getters and Setters ...
}

UserRole.java

@Entity
@Table(name = "SFT_USER_ROLE")
public class UserRole extends AbstractEntity {

    @Id
    @SequenceGenerator(name="id_seq_sft_user_role", sequenceName = "seq_sft_user_role", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_seq_sft_user_role")
    private Long id;
    
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ID_USER", referencedColumnName = "ID", nullable = false)
    private User user;
    
    @Enumerated(EnumType.STRING)
    private EnumUserRole userRole;
    
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="DT_REGISTER")
    private Date dtRegister;

... Getters and Setters ...
}

UserRepository.java

@Repository
@Transactional
public interface UserRepository extends JpaRepository<User, Long> {

    User findByUsername(String username);
}

public class Example {
    @Autowired
    private UserRepository userRepository;

    public void testExample(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username);
        
        List<UserRole> userRoles = user.getUserRoles();
    }

}