各位好，小弟初学Spring想通过AOP配置将Hibernate数据库事务扩展到DAO层，防止出现懒加载异常。可是通过配置发现在进行单元测试时系统一直报错，所以特来请教请各位帮忙看看是什么问题，谢谢了！以下为Spring 事务配置文件：<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation"
value="file:src/hibernate.cfg.xml">
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<aop:config proxy-target-class="true">
<aop:advisor pointcut="execution(* mycompy.servicesystem.dao..*.*(..))"
advice-ref="txAdvice"/>
</aop:config>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="add*" rollback-for="java.lang.Throwable"/>
<tx:method name="modify*" rollback-for="java.lang.Throwable"/>
<tx:method name="find*,get*,is*,has*" read-only="true"/>
<tx:method name="*" rollback-for="java.lang.Throwable"/>
</tx:attributes>
</tx:advice>
<bean id="areaDao" class="mycompy.servicesystem.dao.impl.AreaDaoImpl">
<property name="hibernateTemplate" ref="hibernateTemplate" />
</bean>
其中的DAO层我有使用了泛型结构大致如下：
AreaDaoImpl.java public class AreaDaoImpl extends HibernateDaoImpl<Area, String> implements
IAreaDao {
............
}
HibernateDaoImpl.java public class HibernateDaoImpl<T extends Identifiable, PK extends Serializable> extends
HibernateDaoSupport {
public Class<T> queryClass; @SuppressWarnings("unchecked")
public HibernateDaoImpl() {
Type genType = getClass().getGenericSuperclass();
Type[] parames = ((ParameterizedType) genType).getActualTypeArguments();//这一行有错
queryClass = (Class) parames[0];
}
......}
系统报的错误是：org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'areaDao' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class mycompany.servicesystem.dao.impl.AreaDaoImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is net.sf.cglib.core.CodeGenerationException: java.lang.ClassCastException-->java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)
at mycompany.servicesystem.common.ContextUtil.getApplicationContext(ContextUtil.java:11)
at mycompany.servicesystem.dao.TestDepartmentDao.setUp(TestDepartmentDao.java:39)
BeforeAndAfterRunner.java:74)
at org.junit.internal.runners.BeforeAndAfterRunner.runBefores(BeforeAndAfterRunner.java:50)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:33)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
... 35 more
Caused by: net.sf.cglib.core.CodeGenerationException: java.lang.ClassCastException-->java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:235)
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:220)
... 41 more
Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at mycompany.servicesystem.dao.base.impl.HibernateDaoImpl.<init>(HibernateDaoImpl.java:50)
at mycompany.servicesystem.dao.impl.AreaDaoImpl.<init>(AreaDaoImpl.java:26)
at mycompany.servicesystem.dao.impl.AreaDaoImpl$$EnhancerByCGLIB$$f9ab0600.<init>(<generated>)
... 49 more 网上我也查了一下资料，把下文中的proxy-target-class="true"去掉。 <aop:config proxy-target-class="true">
<aop:advisor pointcut="execution(* mycompy.servicesystem.dao..*.*(..))" advice-ref="txAdvice"/>
</aop:config> 程序虽然不在启动时抛异常，而在进行查询时抛的异常，这个异常我看了一下是与懒加载有关的，我查了一下我的代码，我的确进行了延迟加载。但我又有一个疑问，我不是给所有的DAO加了事务处理了吗，那也就意味着在事务中会打开Session应该不存在懒加载的问题。但这里却有这个问题请大家帮帮我！！！！下文是去除proxy-target-class="true"后系统给的异常信息
(hibernate.LazyInitializationException 19 ) failed to lazily initialize a collection of role: mycompany.servicesystem.entities.Area.Departments, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: mycompany.servicesystem.entities.Area.Departments, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentSet.toArray(PersistentSet.java:146)
at java.util.ArrayList.<init>(ArrayList.java:131)
at mycompany.servicesystem.dao.impl.AreaDaoImpl.getDepartmentById(AreaDaoImpl.java:84)
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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy7.getDepartmentById(Unknown Source)
at mycompany.servicesystem.dao.TestAreaDao.testGetDepartmentById(TestAreaDao.java:65)
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)附：有的大虾可能会说我为什么把事务放在DAO层，那是因为我现在正进行DAO层代码编写后继我会放在Service层去的，所以请大虾回答问题时不要指出这点问题！
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation"
value="file:src/hibernate.cfg.xml">
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<aop:config proxy-target-class="true">
<aop:advisor pointcut="execution(* mycompy.servicesystem.dao..*.*(..))"
advice-ref="txAdvice"/>
</aop:config>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="add*" rollback-for="java.lang.Throwable"/>
<tx:method name="modify*" rollback-for="java.lang.Throwable"/>
<tx:method name="find*,get*,is*,has*" read-only="true"/>
<tx:method name="*" rollback-for="java.lang.Throwable"/>
</tx:attributes>
</tx:advice>
<bean id="areaDao" class="mycompy.servicesystem.dao.impl.AreaDaoImpl">
<property name="hibernateTemplate" ref="hibernateTemplate" />
</bean>
其中的DAO层我有使用了泛型结构大致如下：
AreaDaoImpl.java public class AreaDaoImpl extends HibernateDaoImpl<Area, String> implements
IAreaDao {
............
}
HibernateDaoImpl.java public class HibernateDaoImpl<T extends Identifiable, PK extends Serializable> extends
HibernateDaoSupport {
public Class<T> queryClass; @SuppressWarnings("unchecked")
public HibernateDaoImpl() {
Type genType = getClass().getGenericSuperclass();
Type[] parames = ((ParameterizedType) genType).getActualTypeArguments();//这一行有错
queryClass = (Class) parames[0];
}
......}
系统报的错误是：org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'areaDao' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class mycompany.servicesystem.dao.impl.AreaDaoImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is net.sf.cglib.core.CodeGenerationException: java.lang.ClassCastException-->java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)
at mycompany.servicesystem.common.ContextUtil.getApplicationContext(ContextUtil.java:11)
at mycompany.servicesystem.dao.TestDepartmentDao.setUp(TestDepartmentDao.java:39)
BeforeAndAfterRunner.java:74)
at org.junit.internal.runners.BeforeAndAfterRunner.runBefores(BeforeAndAfterRunner.java:50)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:33)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
... 35 more
Caused by: net.sf.cglib.core.CodeGenerationException: java.lang.ClassCastException-->java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:235)
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:220)
... 41 more
Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at mycompany.servicesystem.dao.base.impl.HibernateDaoImpl.<init>(HibernateDaoImpl.java:50)
at mycompany.servicesystem.dao.impl.AreaDaoImpl.<init>(AreaDaoImpl.java:26)
at mycompany.servicesystem.dao.impl.AreaDaoImpl$$EnhancerByCGLIB$$f9ab0600.<init>(<generated>)
... 49 more 网上我也查了一下资料，把下文中的proxy-target-class="true"去掉。 <aop:config proxy-target-class="true">
<aop:advisor pointcut="execution(* mycompy.servicesystem.dao..*.*(..))" advice-ref="txAdvice"/>
</aop:config> 程序虽然不在启动时抛异常，而在进行查询时抛的异常，这个异常我看了一下是与懒加载有关的，我查了一下我的代码，我的确进行了延迟加载。但我又有一个疑问，我不是给所有的DAO加了事务处理了吗，那也就意味着在事务中会打开Session应该不存在懒加载的问题。但这里却有这个问题请大家帮帮我！！！！下文是去除proxy-target-class="true"后系统给的异常信息
(hibernate.LazyInitializationException 19 ) failed to lazily initialize a collection of role: mycompany.servicesystem.entities.Area.Departments, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: mycompany.servicesystem.entities.Area.Departments, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentSet.toArray(PersistentSet.java:146)
at java.util.ArrayList.<init>(ArrayList.java:131)
at mycompany.servicesystem.dao.impl.AreaDaoImpl.getDepartmentById(AreaDaoImpl.java:84)
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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy7.getDepartmentById(Unknown Source)
at mycompany.servicesystem.dao.TestAreaDao.testGetDepartmentById(TestAreaDao.java:65)
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)附：有的大虾可能会说我为什么把事务放在DAO层，那是因为我现在正进行DAO层代码编写后继我会放在Service层去的，所以请大虾回答问题时不要指出这点问题！
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第一个：为什么会代理对象错误。Spring的AOP编程采用的是动态代理机制，分两种方法：JDK代理和CGLIB代理。前者要求被代理类实现一个接口。就是你添加事务的DAO要实现一个接口。CGLIB代理则不需要被代理类（你的DAO类）实现接口。Spring会自动根据你的被代理类（添加事物控制的地方）是否实现接口来选择采用哪种代理。proxy-target-class="true" 你写了这句。他的意思是：不要给我自动检查，我就用CGLB代理。因为你的被代理类实现了接口，当然报错。去掉了，自动检查——实现接口——Spring采用了JDK代理处理事务。第二个没遇到过，但是Hibernate对事务的控制，本身就是在DAO层的啊。。你用了Spring+Hibernate的框架，应该是Spring会自动帮你在DAO层关掉session（hibernate的DAO代码中是没有关session的代码的）。那你又在DAO层加了事务控制，感觉还是一样的，本身就在那里关，你也在那里关。当然会报LIZ异常啊。高手指正