我上周刚刚学习了 Hibernate 的乐观锁定,并将其引入到我用 Spring JPA 和 MySQL DB 编写的应用程序中。
我的实体看起来像这样,Version
刚刚添加了注释,
@Entity
public class Instance {
...
@javax.persistence.Version
private Date updateTime;
...
pubic Instance() {
this.updateTime = new Date();
}
}
我有一个org.springframework.data.repository.CrudRepository
用于持久化数据。虽然我验证更新现有记录工作正常,但问题是在持久化新对象时会抛出异常,
inst = new Inst();
instanceRepo.save(inst);
抛出的异常是
org.springframework.orm.ObjectOptimisticLockingFailureException: Object of class [Instance] with identifier [a5deddb9-d76c-433f-8b0d-e50cbf8f601e]: optimistic locking failed; nested exception is org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) :
at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2541)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3285)
at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3183)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3525)
at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:159)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:465)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:351)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1258)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:425)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)
at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:77)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:761)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:485)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:131)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy139.save(Unknown Source)
这只是第一个持久性调用,我不认为有多个线程尝试更新此记录,所以我很困惑为什么会抛出此异常。
我还尝试追踪底层代码,这里的一些发现可能会有所帮助,
调用底层时
org.springframework.data.jpa.repository.support.SimpleJpaRepository#save(S)
如下粘贴,即使这是一条新记录,代码也会进入合并逻辑,public <S extends T> S save(S entity) { if (entityInformation.isNew(entity)) { em.persist(entity); return entity; } else { return em.merge(entity); } }
当它尝试提交事务并刷新数据库时会发生异常。
最佳答案
JPA 规范是这么说的
版本属性支持以下类型:int、Integer、short、Short、long、Long、java.sql.Timestamp。
使用java.util.Date类型时可能会出现问题。
关于mysql - 乐观锁失败;使用 Spring Data 的 CrudRepository 保存记录时,嵌套异常为 org.hibernate.StaleObjectStateException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38064577/