Hibernate和Jackson（java.lang.IllegalStateException：在提交响应后无法调用sendError（）） [英] Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed)

问题描述

您好Hibernate和Jackson有些问题。有两个POJO

Hello have some problem with Hibernate and Jackson. Have two POJOs

@Entity
@Table(name = "USERS")
public class User implements Serializable {
static final long serialVersionUID = 4235637833262722256L;

@Id
@GeneratedValue
private int id;

@Column(name = "CREATION_DATE")
private Date creationDate;

@Column(name = "FIRST_NAME")
private String firstName;

@Column(name = "LAST_NAME")
private String lastName;

@Version
@Column(name = "VERSION")
private int version;

@Column(name = "E_MAIL")
private String email;

@Column(name = "ENABLED")
private boolean enabled;

@Column(name = "LOGIN")
private String login;

@Column(name = "PASSWORD")
private String password;

@JsonManagedReference("role")
@OneToMany(mappedBy = "user", cascade = CascadeType.ALL,fetch = FetchType.EAGER)
private Set<UserRole> userRole;

用户及其为春季安全集成所扮演的角色。

User's and his Role that's made for spring security integration.

@Entity
@Table(name = "USER_ROLES")
public class UserRole {

@Version
@Column(name = "VERSION")
int version;
@Id
@GeneratedValue
private int id;

@JsonBackReference("role")
@ManyToOne()
@JoinColumn(name = "USER_ID", referencedColumnName = "ID")
private User user;

@Column(name = "ROLE")
private String role;

并且有一个控制器，通过杰克逊从用户Json制作。使用方法

And have a controller which make from User Json via Jackson. With method

  @RequestMapping(value = "/login", method = RequestMethod.GET, produces = "application/json")
private @ResponseBody User checkLoginAvailability(@RequestParam String login) {
    User user = appContext.getUserService().readUserByLogin(login);
    if (user != null) {
        return user;
    }
    return new User();
}

当此方法返回没有空字段的用户时，它会抛出：

When this method return user without null fields it throws that:

26-Oct-2014 14:31:17.652 WARNING [http-nio-8080-exec-4] 
org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.doResolveException 
Handling of [org.springframework.http.converter.HttpMessageNotWritableException]
resulted Exception java.lang.IllegalStateException: Cannot call sendError() after the response has been committed

当我添加@OneToMany（mappedBy =user，cascade = CascadeType.ALL）时出现问题，fetch = FetchType.EAGER），之前它只是fetch = FetchType.EAGER，但是我无法用他的角色保存用户，因为表USER_ROLE是空的。我在杰克逊的某处无限循环中解决了一些问题的解决方案，添加了一些anotation @JsonBackReference（role）和@JsonManagedReference（role）但没有任何改变。我怎么解决这个问题？谢谢！

That's problem came when i added @OneToMany(mappedBy = "user", cascade = CascadeType.ALL,fetch = FetchType.EAGER), previously it was just fetch = FetchType.EAGER, but i wasn't able to save User with his role in this case the table USER_ROLE was empty. I've red some solution that problem in infinite loop somewhere in Jackson, added some anotation @JsonBackReference("role") and @JsonManagedReference("role") but nothing changed. How can i solve this problem? Thank you!

推荐答案

我建议在属性上添加 @jsonignore 导致循环引用。这将告诉杰克逊不要序列化该属性。

i recommend adding @jsonignore on the property that is causing the circular reference. this will tell jackson not to serialize that property.

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