求解决啊 郁闷死了 一下午都没弄好 急

15:44:02,718 ERROR ContextLoader:215 - Context initialization failedorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in file [D:\TDDOWNLOAD\apache-tomcat-6.0.30\apache-tomcat-6.0.30\webapps\dayDate\WEB-INF\classes\applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.component.PojoComponentTuplizer]    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1420)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:563)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4172)    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4671)    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1041)    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)    at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)    at org.apache.catalina.core.StandardService.start(StandardService.java:525)    at org.apache.catalina.core.StandardServer.start(StandardServer.java:701)    at org.apache.catalina.startup.Catalina.start(Catalina.java:585)    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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer