JsonIgnore 和 JsonBackReference 被忽略

Question

我正在使用 spring 4.0.1、hibernate 4.3.5、jackson 1.9.2 和 STS IDE我正在创建一个以 JSON 格式返回数据的 RESTful 网络服务当我使用 Hibernate 代码生成器时，它会为源生成由 @OneToMany(fetch = FetchType.LAZY, mappedBy = "user") 注释的关联实体的 getter 和 setter和 @ManyToOne(fetch = FetchType.LAZY) 供引用这会在序列化期间导致无限递归。我尝试使用 Jackson 的 @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。

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError)

这是我的实体类用户类

    //i get that suggestion from some sites
    @JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
    @Entity
    @Table(name = "user", catalog = "someSchema")    
    public class User implements java.io.Serializable {

        private String name;
        private String password;
        private String username;
        private Set<Telephone> telephones = new HashSet<Telephone>(0);
        @JsonManagedReference
        @OneToMany(fetch = FetchType.LAZY, mappedBy = "user")
        public Set<Telephone> getTelephones() {
            return this.telephones;
        }

        public void setTelephones(Set<Telephone> telephones) {
            this.telephones = telephones;
        }
    }

Telephone.class

@Entity
@Table(name = "telephone", catalog = "someSchema")
public class Telephone implements java.io.Serializable {


    private User user;
    private String telephone;

    @ManyToOne(fetch = FetchType.LAZY)
//tried @JsonIgnore only and both
    @JsonIgnore
//tried @JsonBackReference only and both
    @JsonBackReference
    @JoinColumn(name = "user_id", nullable = false)
    public User getUser() {
        return this.user;
    }


    @JsonIgnore
    @JsonBackReference
    public void setUser(User user) {
        this.user = user;
    }

}

关于将 jackson 注册到我的应用程序，我使用了 xml 配置

   <mvc:annotation-driven>
        <mvc:message-converters>
            <bean
                class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean
                        class="web.jsonConverters.HibernateAwareObjectMapper" />
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

和映射器类

public class HibernateAwareObjectMapper extends ObjectMapper {

    public HibernateAwareObjectMapper() {
        Hibernate4Module hm = new Hibernate4Module();
        registerModule(hm);
    }
}

您知道为什么 Jackson 注释被忽略了吗？

任何帮助将不胜感激...

Answer 1

使用

import com.fasterxml.jackson.annotation.JsonBackReference;

代替

import org.codehaus.jackson.annotate.JsonBackReference;