@ManyToMany值始终为 null

问：

我有这个POJO类： 包 com.weather.weather.entity;

import jakarta.persistence.*;import lombok.Data;

import lombok.NoArgsConstructor;import org.hibernate.annotations.Proxy;import org.springframework.transaction.annotation.Transactional;

import java.util.List;import java.util.Set;

@Entity@Table(name = "users")@Data@NoArgsConstructor

public class User {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)

private Long id;

@Column(name = "username")
private String username;

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



@ManyToMany(fetch = FetchType.EAGER)
@JoinTable(name = "collaborator",
        joinColumns = @JoinColumn(name = "user_id"),
        inverseJoinColumns = @JoinColumn(name = "role_id")
)
private Set<Role> roles;

}

Also Role class:

package com.weather.weather.entity;

import jakarta.persistence.*;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.Proxy;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Set;

@Entity
@Table(name = "roles")
@Data
@NoArgsConstructor
public class Role {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


    private String name;


//    @OneToMany(mappedBy = "role")
//    private List<User> users;

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


}
But always getRoles() are null.

我尝试将数据更改为 @OneToOne、@ManyToOne @OneToMany.但它总是空的。在某个时候，当我以@ManyToOne方式做事时，我遇到了这个例外：

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.weather.weather.entity.Role.users: could not initialize proxy - no Session

我找到了解决这个问题的方法。我试过放置 fetch 属性、@Proxy（lazy=false） 等等。没有任何帮助