我正在尝试对 StatelessSession 进行简单的保存。有人能发现我做错了什么，导致 Hibernate 方法尝试将 StatelessSession 无效转换为 Session。如果有任何反馈，我将不胜感激。
我的示例代码：
StatelessSession statelessSession = getSessionFactory().openStatelessSession();
Transaction tx = statelessSession.beginTransaction();
Object ret = null;
try {
ret = statelessSession.insert(obj);
tx.commit();
statelessSession.close();
} catch (Throwable t) {
System.out.println("exception: " + t.getMessage());
tx.rollback();
}
return (T) ret;
异常发生在 .insert(obj) 调用上。跟踪代码使我进入 AbstractEntityPersister 类，该类尝试在此方法中将该无状态会话转换为会话：
private void preInsertInMemoryValueGeneration(Object[] fields, Object object, SessionImplementor session) {
if ( getEntityMetamodel().hasPreInsertGeneratedValues() ) {
final InMemoryValueGenerationStrategy[] strategies = getEntityMetamodel().getInMemoryValueGenerationStrategies();
for ( int i = 0; i < strategies.length; i++ ) {
if ( strategies[i] != null && strategies[i].getGenerationTiming().includesInsert() ) {
fields[i] = strategies[i].getValueGenerator().generateValue( (Session) session, object ); // <-- bad cast here
setPropertyValue( object, i, fields[i] );
}
}
}
}
这是堆栈跟踪：
java.lang.ClassCastException: org.hibernate.internal.StatelessSessionImpl cannot be cast to org.hibernate.Session
at org.hibernate.persister.entity.AbstractEntityPersister.preInsertInMemoryValueGeneration(AbstractEntityPersister.java:3591)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3568)
at org.hibernate.internal.StatelessSessionImpl.insert(StatelessSessionImpl.java:144)
at org.hibernate.internal.StatelessSessionImpl.insert(StatelessSessionImpl.java:123)
at com.mycompany.somepackage.dao.impl.CommonDAOImpl.persist2(CommonDAOImpl.java:242)
at com.mycompany.somepackage.publisher.ScJournalPublisher.publish(ScJournalPublisher.java:37)
at com.mycompany.somepackage.annotation.callback.CallbackInvoker.invokePublisherCallback(CallbackInvoker.java:92)
at com.mycompany.somepackage.event.listener.DaPostInsertUpdateEventListener.onPostInsert(DaPostInsertUpdateEventListener.java:51)
at org.hibernate.action.internal.EntityInsertAction.postInsert(EntityInsertAction.java:177)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:145)
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.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:584)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:757)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:726)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:521)
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.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
已经为此打开了一个问题请求！这应该在 Hibernate 5.2.2 中可用
https://hibernate.atlassian.net/browse/HHH-11048 https://hibernate.atlassian.net/browse/HHH-11048
getEntityMetamodel().hasPreInsertGeneratedValues()返回 true，因为您必须在插入之前拥有由休眠生成的内容！
示例：时间戳或自动生成的 ID 等。
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