更新休眠实体时出现问题

Question

我正在尝试配置菜和餐厅之间的多对一关系。创建/读取/删除操作可以正常工作，但当我尝试更新菜式实体时，我会遇到这个错误：

org.hibernate.PersistentObjectException: detached entity passed to persist: org.polik.votingsystem.model.Dish
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:120) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:55) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:760) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:746) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362) ~[spring-orm-5.3.16.jar:5.3.16]
at jdk.proxy3/jdk.proxy3.$Proxy115.persist(Unknown Source) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311) ~[spring-orm-5.3.16.jar:5.3.16]
at jdk.proxy3/jdk.proxy3.$Proxy115.persist(Unknown Source) ~[na:na]
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:637) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:529) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:285) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:639) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.16.jar:5.3.16]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:163) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:138) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.16.jar:5.3.16]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.16.jar:5.3.16]

菜品实体：

@Entity
@Table(name = "dishes")
@Getter
@Setter
@ToString
@NoArgsConstructor
public class Dish extends BaseEntity {
@Column(name = "name")
@NotNull
private String name;
@Column(name = "price")
@NotNull
private Integer price;
@ManyToOne(fetch = FetchType.EAGER, cascade = {CascadeType.MERGE, CascadeType.REFRESH})
@JoinColumn(name = "restaurant_id")
private Restaurant restaurant;
@Column(name = "date")
@CreationTimestamp
private LocalDate date;
public Dish(Integer id, String name, Integer price) {
super(id);
this.name = name;
this.price = price;
}
public Dish(Integer id, String name, Integer price, Restaurant restaurant, LocalDate date) {
super(id);
this.name = name;
this.price = price;
this.restaurant = restaurant;
this.date = date;
}
}

餐厅实体

@Entity
@Table(name = "restaurant")
@Getter
@Setter
@NoArgsConstructor
public class Restaurant extends BaseEntity {
@Column(name = "name")
@NotNull
private String name;
}

基本实体

@MappedSuperclass
@Access(AccessType.FIELD)
@Getter
@Setter
@NoArgsConstructor
public abstract class BaseEntity implements Persistable<Integer> {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
protected Integer id;
public BaseEntity(Integer id) {
this.id = id;
}
@Override
public boolean isNew() {
return id != null;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || !getClass().equals(Hibernate.getClass(o))) {
return false;
}
BaseEntity that = (BaseEntity) o;
return id != null && id.equals(that.id);
}
@Override
public int hashCode() {
return id == null ? 0 : id;
}
}

更新方法

@Transactional
public void update(DishTo dishTo, int id) {
Dish dish = new Dish(
id,
dishTo.getName(),
dishTo.getPrice(),
getRestaurantById(dishTo.getRestaurantId()),
LocalDate.now()
);
log.info("update {}", dish);
checkNotFound(repository.save(dish), "id=" + id);
}

我尝试过的：

1. 更改级联类型
2. 变革战略
3. 将fetchtype设置为渴望

Answer 1

问题已解决。现在，我完全不知道为什么，但当我将dish初始化从构造函数更改为setter时，它开始正常工作。

解决方案：

@Transactional
public void update(DishTo dishTo, int id) {
log.info("update {} {}", dishTo, id);
Dish dish = new Dish();
ValidationUtil.assureIdConsistent(dish, id);
dish.setName(dishTo.getName());
dish.setPrice(dishTo.getPrice());
dish.setRestaurant(
getRestaurantById(dishTo.getRestaurantId())
);
repository.save(dish);
}