我有一个使用Hibernate作为后端的Spring WebMVC应用程序。由于我的域模型在不断变化，并且我没有使用旧数据库作为后端，因此我将Hibernate设置为每次通过<property name="generateDdl" value="true"/>在spring config中进行设置来启动应用程序时自动生成表。
<property name="generateDdl" value="true"/>
问题出在我的一个实体与共享同一父类的实体类型具有两个一对多的关系。这是我的班级的非常基本的版本，仍然显示出该问题：
@Entity public abstract class Base { @Id @GeneratedValue private long id; } @Entity public class ChildTypeA extends Base{ } @Entity public class ChildTypeB extends Base{ } @Entity public class Container { @Id @GeneratedValue private long id; @OneToMany(cascade = CascadeType.ALL) Set<ChildTypeA> childrenA = new HashSet<ChildTypeA> (); @OneToMany(cascade = CascadeType.ALL) Set<ChildTypeB> childrenB = new HashSet<ChildTypeB>(); public void addChildA(ChildTypeA child){ childrenA.add(child); } public void addChildB(ChildTypeB child){ childrenB.add(child); } }
运行以下测试：
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(value = "classpath*:WEB-INF/spring-data.xml") public class NewTest { @Autowired DataGenerator dataGenerator; @Test //@Transactional public void test(){ dataGenerator.generateTestData(); } } @Component public class DataGenerator { @PersistenceContext EntityManager em; @Transactional public void generateTestData(){ Container c = new Container(); c.addChildA(new ChildTypeA()); em.persist(c); } }
给我以下日志：
Hibernate: insert into Base (id, DTYPE) values (null, 'ChildTypeA') Hibernate: call identity() Hibernate: insert into Container (id) values (null) Hibernate: call identity() Hibernate: insert into Container_Base (Container_id, childrenA_id) values (?, ?) WARN : org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null ERROR: org.hibernate.util.JDBCExceptionReporter - failed batch ERROR: org.hibernate.event.def.AbstractFlushingEventListener - Could not synchronize database state with session org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:262) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:182) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137) at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:76) at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:467) at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754) at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723) at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at com.whiteboard.wb.data.sample.DataGenerator$$EnhancerByCGLIB$$5c355801.generateTestData(<generated>) at entity.NewTest.test(NewTest.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.junit.runner.JUnitCore.run(JUnitCore.java:157) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:71) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:199) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:62) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) Caused by: java.sql.BatchUpdateException: failed batch at org.hsqldb.jdbc.jdbcStatement.executeBatch(Unknown Source) at org.hsqldb.jdbc.jdbcPreparedStatement.executeBatch(Unknown Source) at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268) ... 49 more Hibernate: select container0_.id as id3_ from Container container0_ org.springframework.orm.hibernate3.HibernateJdbcException: JDBC exception on Hibernate data access: SQLException for SQL [insert into Container_Base (Container_id, childrenA_id) values (?, ?)]; SQL state [null]; error code [0]; Could not execute JDBC batch update; nested exception is org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:645) at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:102) at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:471) at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754) at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723) at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at com.whiteboard.wb.data.sample.DataGenerator$$EnhancerByCGLIB$$5c355801.generateTestData(<generated>) at entity.NewTest.test(NewTest.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.junit.runner.JUnitCore.run(JUnitCore.java:157) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:71) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:199) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:62) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) Caused by: org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:262) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:182) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137) at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:76) at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:467) ... 40 more Caused by: java.sql.BatchUpdateException: failed batch at org.hsqldb.jdbc.jdbcStatement.executeBatch(Unknown Source) at org.hsqldb.jdbc.jdbcPreparedStatement.executeBatch(Unknown Source) at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268) ... 49 more
但是，如果将@Test方法包装在@Transactional中，该错误就会消失，并且容器和子级都将成功保留。另外，如果我删除了带有ChildTypeB的OneToMany并仅与ChildTypeA有关系，则容器和子项都将成功持久保存。
这是Spring的Application Managed Persistence的错误吗？还是我理解@Transactional错误？或者，我是否需要告诉Hibernate通过关系上的注释或类本身将孩子分成不同的表？
谢谢您的帮助。
编辑：
添加我的Persistence.xml和spring-data.xml
Persistence.xml（所有实际工作都在spring-data.xml中完成）：
<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="spring-jpa" /> </persistence>
spring-data.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <!-- Scans the classpath of this application for @Components to deploy as beans --> <context:component-scan base-package="com.whiteboard.wb"/> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="persistenceUnitName" value="spring-jpa"/> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="showSql" value="true"/> <property name="generateDdl" value="true"/> <property name="database" value="HSQL"/> </bean> </property> </bean> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <tx:annotation-driven transaction-manager="transactionManager"/> <jdbc:embedded-database id="dataSource" type="HSQL"/> </beans>
唯一的问题是：Base应该用@MappedSuperClass代替@Entity。此后-并提供pom- 无论@Transactional测试方法有无，它都可以正常工作。我把它放在github上。您可以浏览或克隆并运行它
Base
@MappedSuperClass
@Entity
@Transactional
git clone git://github.com/zzantozz/testbed tmp cd tmp mvn clean test -pl stackoverflow/7809543-hibernate-spring-jpa
我认为在蒸馏时，您可以找出造成问题的原因。有时候，当您完全迷路时，将项目的一个分支（如果您在git中）或在一个单独的目录中创建一个副本（如果您负担了SVN的工作）并开始破解是很有帮助的在您完全将其归结为引起问题的代码/配置之前，这不会有问题。
更新： 了解曙光。第一个问题：取决于测试是否为@Transactional，其行为不同的原因是测试事务与您的DataGenerator事务不同。在测试中，事务将在测试结束时回滚。在中DataGenerator，它已提交。更重要的是，在测试中不会刷新EntityManager，因为这通常仅在提交时发生。flush()是什么导致SQL发出到数据库，这就是您的错误出处。如果您使用EntityManager注入测试并调用flush()在测试方法的最后，您将在@Transactional测试中看到与现在在非@Transactional测试中看到的行为相同的行为。当您进行事务回滚以保持数据库干净时，这是测试的相当标准的价格。
DataGenerator
flush()
第二个问题：因为Base是一个实体，而不仅仅是包含一些我最初想到的公共字段的超类，所以您正在处理继承映射。（基于注释的继承在单独的Hibernate注释参考中介绍。）无论您是否意识到，您都隐式选择了“单个表”继承策略。无论是好是坏，它都是映射继承的JPA默认设置。这意味着Base，ChildTypeA和ChildTypeB的所有字段都包含在Base表中。如果您拒绝记录日志以进行调试，则会看到Hibernate正在生成此表结构：
create table Base (DTYPE varchar(31) not null, id bigint generated by default as identity (start with 1), primary key (id)) create table Container (id bigint generated by default as identity (start with 1), primary key (id)) create table Container_Base (Container_id bigint not null, childrenB_id bigint not null, childrenA_id bigint not null, primary key (Container_id, childrenA_id), unique (childrenB_id), unique (childrenA_id))
您的麻烦来自Container_Base。如果仔细看，您会发现该表中的条目必须同时具有ChildTypeA主键 和 ChildTypeB主键。这不能准确反映您的对象模型，它们是两个不相关的集合。我不确定为什么Hibernate会这样做。我的猜测是，它只看到两个（隐式）联接表映射（即一对多关系的两个联接表），它们具有相同的表名并将它们组合在一起。这看起来像是向我报告错误的候选人。无论如何，至少有两种方法可以解决此问题：
@Inheritance(strategy = InheritanceType.JOINED)
@JoinTable(name = "containerChildA")
@JoinTable(name = "containerChildB")
