ManyToMany 关系导致 *** 错误

Posted 2023-02-26

【中文标题】ManyToMany 关系导致 *** 错误

【英文标题】：ManyToMany relationship leads to *** error

【发布时间】：2019-09-14 05:31:30

【问题描述】：

我有一个名为 User 的实体，它有一组角色。我还有一个 Role 实体，它有一组用户。（这只是一个用于学习目的的练习应用程序。）

public class User 

    private String firstName;
    private String lastName;

    @ManyToMany
    @JoinTable(name="user_role", 
            joinColumns=@JoinColumn(name="user_id"), 
            inverseJoinColumns=@JoinColumn(name="role_id"))
    private Set<Role> roles;

    //getters setters

public class Role 

    private String name;

    @ManyToMany(mappedBy="roles")
    private Set<Users> users;

    //getters setters

Table: User      (id, firstname, lastname....)
Table: Role      (id, name)
Table: User_Role (id, user_id, role_id)

问题是 - 我有一个 UserController (REST API) 来发送用户列表 - 它导致 *** 错误。用户尝试加载角色，而角色又尝试加载用户等。

我的问题是 - 如何避免这种情况？我也看到很多类似的设计。例如：https://viralpatel.net/blogs/hibernate-many-to-many-annotation-mapping-tutorial/

他们怎么没有遇到过这样的问题？

---

java.lang.***Error: null
    at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_191]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_191]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_191]
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) ~[na:1.8.0_191]
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74) ~[na:1.8.0_191]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369) ~[na:1.8.0_191]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363) ~[na:1.8.0_191]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_191]
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362) ~[na:1.8.0_191]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_191]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_191]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_191]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:737) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.8.jar:2.9.8]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.8.jar:2.9.8]

【问题讨论】：

如果将用户返回为json，则需要添加json注释以忽略角色的用户字段...否则json库（gson？）会进入这个无限循环

你能告诉我们你的堆栈跟踪吗？可能是序列化时出错。

@antoine.lange 是的。它发生在我们序列化时

您可以查看***.com/questions/3325387/…了解更多详情

Infinite Recursion with Jackson JSON and Hibernate JPA issue的可能重复

【参考方案1】：

我想在 json 序列化过程中有一个循环引用。 因此，您需要使用@JsonIgnore 注解从序列化过程中排除这两个字段之一。

在此处查看之前的回复：https://***.com/a/39985263/2311723

【参考方案2】：

或者您可以将您的实体转换为 DTO（数据传输对象）并返回 DTO。我建议不要直接返回实体