Jackson部分工作，无法返回列表或集合

Question

我正在使用spring MVC&hibernate作为我的WebApp。现在的问题是，如果返回一个对象，我可以生成json，但不能生成列表。我错过什么了吗？

（1）如果我访问此：

@ResponseBody
@RequestMapping("/mobile/userDetail")
public UserDetail generateUserDetailJson(){
    return userDetailService.getUserDetail(1);
}

结果好的，我将得到这个json返回：

{"udId":1,"udTitle":"Mr","udUsername":"username","udFirstname":"firstname","udLastname":"lastname","udGender":"male","udPhoto":"c:/folder/gg.jpg","udPassword":"password","udEmail":"[e-mail]","udPhoneHome":"01234567890","udPhoneMobile":"","udType":"customer","udLanguage":"ms","udLoginLast":1466875438000,"udLoginCount":0,"udCreateDatetime":1466875438000,"udStatus":2,"bodyMeasures":[{"bmId":1,"bmHeight":171,"bmNeck":null,"bmShoulder":null,"bmArm":null,"bmChest":null,"bmWaist":null,"bmHip":null,"bmInseam":null,"bmThigh":null,"bmCalf":null,"bmFoot":null,"bmHead":null,"bmCreateDatetime":1466875438000,"bodyMeasureHistories":[]}],"addresses":[],"userDetailHistories":[]}

（2）但如果我访问这个：

@ResponseBody
@RequestMapping("/mobile/userDetails")
public Collection<UserDetail> generateUserDetailsJson(){
    Collection<UserDetail> collection = userDetailService.listUserDetails(); 
    return collection;
}

我会得到这个例外。

<mvc:annotation-driven />
<tx:annotation-driven />

jackson-annotations-2.7.0.jar

jackson-core-2.7.0.jar

jackson-databind-2.7.0.jar

javax.el-2.2.4.jar

javax.el-api-2.2.4.jar

实体表已配置Jackson：

@Entity
@Table(name = "body_measure", catalog = "faddistwardrobedb")
public class BodyMeasure implements java.io.Serializable {
    @ManyToOne(fetch = FetchType.LAZY)
    @JsonBackReference
    @JoinColumn(name = "ud_id")
    private UserDetail userDetail;
    //etc....
}

@Entity
@Table(name = "user_detail", catalog = "faddistwardrobedb")
public class UserDetail implements java.io.Serializable {

    @JsonManagedReference
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "userDetail")
    //etc.....
}

有什么我错过的吗？还是图书馆互相起了冲突？多谢了。

Answer 1

找到了解决办法，但不知道细节出了什么问题。我的解决方案:Glassfish 4.1->Glassfish 4.1.1重新编译并运行，问题解决了。希望能帮助面临同样错误的人。