【发布时间】：2021-04-05 11:47:20
【问题描述】：
我将 Quarkus 与 Hibernate 和 Resteasy 一起使用。
当一个实体被持久化时，我想自动创建引用第一个实体的第二个实体。
我尝试使用 @PostPersist 带注释的方法，但它因 SQL 异常而失败。当手动调用该方法时，它会起作用。
MWE：
CREATE TABLE "entity_a" (
"id" IDENTITY
);
CREATE TABLE "entity_b" (
"id" IDENTITY,
"entity_a_id" BIGINT NOT NULL,
FOREIGN KEY ("entity_a_id") REFERENCES "entity_a"("id"),
);
@Entity
public class EntityA {
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
// getter, setter
@PostPersist
public void postPersist() {
EntityB b = new EntityB();
b.setEntityA(this);
JpaOperations.getEntityManager().persist(b);
}
}
@Entity
public class EntityB {
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
@OneToOne
private EntityA entityA;
// getters, setters
}
// in the rest resource class
@POST
@Transactional
public void create() {
EntityA a = new EntityA();
JpaOperations.getEntityManager().persist(a);
}
调用该操作时，我收到以下错误：
org.h2.jdbc.JdbcSQLException: NULL not allowed for column "entity_a_id"
NULL not allowed for column "entity_a_id"; SQL statement:
insert into "entity_b" ("id", "entity_a_id") values (null, ?) [23502-197]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:357)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.get(DbException.java:155)
at org.h2.table.Column.validateConvertUpdateSequence(Column.java:374)
at org.h2.table.Table.validateConvertUpdateSequence(Table.java:798)
at org.h2.command.dml.Insert.insertRows(Insert.java:177)
at org.h2.command.dml.Insert.update(Insert.java:134)
at org.h2.command.CommandContainer.update(CommandContainer.java:102)
at org.h2.command.Command.executeUpdate(Command.java:261)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:199)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:153)
at io.agroal.pool.wrapper.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:86)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:197)
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:45)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3200)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3806)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:84)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:645)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:263)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:317)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:330)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:123)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:185)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:128)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:55)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:102)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:720)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:706)
at io.quarkus.hibernate.orm.runtime.entitymanager.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:116)
at io.quarkus.hibernate.orm.runtime.entitymanager.ForwardingEntityManager.persist(ForwardingEntityManager.java:27)
at example.EntityA.postPersist(EntityA.java:24)
...
当我删除 @PostPersist 注释并从其余资源（getEntityManager().persist 之后）调用该方法时，它按预期工作。
当我在postPersist 中记录 id 值时，它被设置了。为什么会失败，我该如何解决？
【问题讨论】：
-
您的静态访问是一个巨大的红旗闪烁的灯光。
-
我用注入对象试了一下，效果一样。
-
也许你可以试试双向映射
标签： java hibernate jpa quarkus