相关疑难解决方法(0)

在尝试将具有双向关联的JPA对象转换为JSON时,我不断获取

org.codehaus.jackson.map.JsonMappingException: Infinite recursion (StackOverflowError)

我找到的只是这个线程,基本上建议避免双向关联.有没有人对这个春天的bug有一个解决方法？

------编辑2010-07-24 16:26:22 -------

Codesnippets:

业务对象1:

@Entity
@Table(name = "ta_trainee", uniqueConstraints = {@UniqueConstraint(columnNames = {"id"})})
public class Trainee extends BusinessObject {

    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    @Column(name = "id", nullable = false)
    private Integer id;

    @Column(name = "name", nullable = true)
    private String name;

    @Column(name = "surname", nullable = true)
    private String surname;

    @OneToMany(mappedBy = "trainee", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @Column(nullable = true)
    private Set<BodyStat> bodyStats;

    @OneToMany(mappedBy = "trainee", fetch = FetchType.EAGER, …

我正在使用RestEasy,Jboss 7和EJB 3.1.我正在创建一个以JSON格式返回数据的RESTful Web服务.

问题是我@ManyToOne在我的一个实体上有一个关系,它会在序列化过程中导致无限递归.我尝试使用杰克逊@JsonIgnore和@JsonBackReference注释来解决这个问题,但似乎它们被完全忽略了,无限递归仍在发生.

这是我的用户类:

class User {
    private String userId;
    private Role role;

    @Id
    @Column(name = "\"UserId\"", unique = true, nullable = false, length = 30)
    public String getUserId() {
        return this.UserId;
    }

    public void setUserId(String UserId) {
        this.UserId = UserId;
    }

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "\"RoleId\"", nullable = false)
    //I have tried @JsonIgnore without @JsonBackReference 
    @JsonIgnore
    //I have tried @JsonBackReference without @JsonIgnore 
    //Also I have tried @JsonBackReference and @JsonIgnore together …