本人小白，
在使用了一对多和多对一的时候出了点问题，具体关联方式如下：
- SysUser
@Entity
@Data
@GenericGenerator(name = "jpa-uuid", strategy = "uuid")
public class SysUser implements Serializable {
@Id
@GeneratedValue(generator = "jpa-uuid")
private String id;
private String email;
private String password;
private String avatar;
private String nickname;
private Long focus;
private Long fans;
private Long articleCount;
private Long fontCount;
private Long likes;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "articleAuthor")
private List<Article> userArticles;
}
- Article
@Entity
@Data
@GenericGenerator(name = "jpa-uuid", strategy = "uuid")
public class Article implements Serializable {
@Id
@GeneratedValue(generator = "jpa-uuid")
private String id;
private String title;
private String synopsis;
private String cover;
private String content;
private Long wordCounts;
private Long readCounts;
private Long comments;
private Long loves;
private String creationTime;
@ManyToOne(cascade={CascadeType.MERGE,CascadeType.REFRESH})
@JoinColumn(name = "author_id")
private SysUser articleAuthor;
}
当使用SysUser类去关联查询的时候，会这样一个错误
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.soft1611.jianshu.domain.entity.SysUser.userArticles, could not initialize proxy - no Session
这里的意思是一方这边是惰性加载，在查找之前session已经关闭，所以无法查找到关联的数据，因此而报错。
那我们将一方的加载方式改为fetch = FetchType.EAGER再运行项目，结果又出问题，错误是：java.lang.StackOverflowError堆栈溢出错误
在网上查找了很多，这里总结了点方法:
- 破坏某一方的toString方法，不要让他打印被定义方的数据；
