我有一个简单的@OneToMany关系的两个对象看起来如下:春季启动JPA - 一对多关系导致无限循环
父:
@Entity
public class ParentAccount {
@Id
@GeneratedValue
private long id;
private String name;
@OneToMany(fetch = FetchType.EAGER, mappedBy = "parentAccount")
private Set<LinkedAccount> linkedAccounts;
}
孩子:
@Entity
public class LinkedAccount {
@Id
@GeneratedValue
private long id;
@ManyToOne(optional = false)
private ParentAccount parentAccount;
private String name;
// empty constructor for JPA
public LinkedAccount() {
}
}
我ma使用Spring CrudRepository
来操作这些实体。但是,调用ParentAccount parent = parentAccountRepository.findOne(id);
时,某种无限循环的开始发生,冬眠垃圾邮件这遍控制台:
Hibernate: select linkedacco0_.parent_account_id as parent_a6_1_0_, linkedacco0_.id as id1_0_0_, linkedacco0_.id as id1_0_1_, linkedacco0_.aws_id as aws_id2_0_1_, linkedacco0_.key_id as key_id3_0_1_, linkedacco0_.name as name4_0_1_, linkedacco0_.parent_account_id as parent_a6_0_1_, linkedacco0_.secret_key as secret_k5_0_1_ from linked_account linkedacco0_ where linkedacco0_.parent_account_id=?
我试着改变了获取类型LAZY但后来我得到这个错误:
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.berrycloud.scheduler.model.ParentAccount.linkedAccounts, could not initialize proxy - no Session
(似乎它试图在事务上下文之外执行延迟加载)。
这是我的CRUD库:
@Repository
public interface ParentAccountRepository extends CrudRepository<ParentAccount, Long> {
}
有人能告诉我如何解决这个问题?我更喜欢EAGER获取的解决方案。感谢您的任何提示
编辑:这是我使用
CREATE TABLE parent_account (
id BIGINT auto_increment,
name VARCHAR(80) null,
PRIMARY KEY (`id`)
);
CREATE TABLE linked_account (
id BIGINT auto_increment,
parent_account_id BIGINT,
name VARCHAR(80) null,
FOREIGN KEY (`parent_account_id`) REFERENCES `parent_account` (`id`),
PRIMARY KEY (`id`)
);
那么,每个父帐户有几个链接的帐户。而已。我没有看到这可以解析成树图。深度应该是1. – Smajl
在您的映射或模式中没有错误...我不认为您的无限循环问题来自...您是否在做这些对象中的其他任何事情?一些JSON/Jackson注释可能? – Pras