我是一个有用的助手,可以翻译文本。
我有两个实体,
我想使用JPA检索一个可用于产品的
但是出现了这个错误:
堆栈跟踪:
我知道这似乎是
我有两个实体,
Promotion
包含有关促销的信息和 Promotion Details
包含在 Promotion
中产品列表。以下是我的代码。
Promotion实体:
@Entity
@Data
public class Promotion {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
@OneToMany(mappedBy = "promotion")
private List<PromotionDetails> details;
@Column(name = "start_date")
private Date startDate;
@Column(name = "end_date")
private Date endDate;
}
PromotionDetails实体:
@Entity
@IdClass(PromotionDetailsPK.class)
@Data
public class PromotionDetails {
@Id
@ManyToOne(optional = false)
@JoinColumn(name = "promotion_id", referencedColumnName = "promotion_id")
private Promotion promotion;
@Id
@ManyToOne(optional = false)
@JoinColumn(name="product_id", referencedColumnName="product_id")
private Product product;
@Column()
private double discount;
}
我想使用JPA检索一个可用于产品的
Promotion
。
PromotionRepository:
@Repository
public interface PromotionRepository extends JpaRepository<Promotion, Long> {
@Query("SELECT promotion "
+ "FROM Promotion promotion "
+ "INNER JOIN promotion.details details "
+ "WHERE details.product.id = :productId "
+ "AND CURRENT_DATE BETWEEN promotion.startDate AND promotion.endDate")
Promotion findOneByProductId(@Param("productId") Long productId);
}
但是出现了这个错误:
堆栈跟踪:
Caused by: java.lang.StackOverflowError: null
at java.lang.StringBuilder.append(Unknown Source)
at java.lang.StringBuilder.<init>(Unknown Source)
at com.example.entity.PromotionDetails.toString(PromotionDetails.java:18)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:527)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at com.example.entity.Promotion.toString(Promotion.java:18)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at com.example.entity.PromotionDetails.toString(PromotionDetails.java:18)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:527)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at com.example.entity.Promotion.toString(Promotion.java:18)
...
...
...
...
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at jp.co.worksap.stm.entity.sales.PromotionDetails.toString(PromotionDetails.java:18)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:527)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at jp.co.worksap.stm.entity.sales.Promotion.toString(Promotion.java:18)
我知道这似乎是
Promotion
在调用 PromotionDetails
,而 PromotionDetails
又在调用 Promotion
,如此往复。但是,我该如何解决这个问题呢?
--编辑--
我想补充一些内容。我正在使用 Lombok 来生成 Getter、Setter 和 toString。