我们目前正在将grails应用程序从2.2.4版迁移到2.5.1版，并将JDK 6迁移到JDK 8。
除了我们的主数据的一项服务之外，所有事情都没有提供任何问题。我们所有的CRUD控制器都使用该服务进行masterdata。控制器是脚手架。
我们正在尝试迁移到Hibernate 4.3.10。
当对上述服务进行CRUD操作时，我们从Hibernate获得一些声明，其中一个SQL语句为null。似乎问题发生在为用户请求多次调用服务时（例如，用于保存实体以及之后计算重定向目标，具体取决于实体状态）。
我们已经在服务和控制器方面使用了@Transactional注释和不同的传播值，但这没有用。
有什么想法吗？
org.hibernate.AssertionFailure: Interceptor.onPrepareStatement() returned null or empty string.
at org.hibernate.internal.SessionImpl.onPrepareStatement(SessionImpl.java:550)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.<init>(StatementPreparerImpl.java:176)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$1.<init>(StatementPreparerImpl.java:100)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.buildPreparedStatementPreparationTemplate(StatementPreparerImpl.java:100)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareStatement(StatementPreparerImpl.java:96)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3238)
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.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:552)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:757)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:726)
at org.codehaus.groovy.grails.transaction.MultiTransactionStatus.commit(MultiTransactionStatus.java:73)
at org.codehaus.groovy.grails.transaction.ChainedTransactionManager.commit(ChainedTransactionManager.java:147)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:150)
at org.codehaus.groovy.grails.orm.support.GrailsTransactionTemplate.execute(GrailsTransactionTemplate.groovy:87)
at de.test.data.OrgUnitController.show(OrgUnitController.groovy)
at de.test.data.OrgUnitController.show(OrgUnitController.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1426)
at org.codehaus.groovy.grails.web.servlet.mvc.MixedGrailsControllerHelper.invoke(MixedGrailsControllerHelper.java:154)
at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.handleAction(AbstractGrailsControllerHelper.java:375)
at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.executeAction(AbstractGrailsControllerHelper.java:252)
at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.handleURI(AbstractGrailsControllerHelper.java:205)
at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.handleURI(AbstractGrailsControllerHelper.java:126)
at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController.handleRequest(SimpleGrailsController.java:72)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
at org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet.doDispatch(GrailsDispatcherServlet.java:347)