今天在小鹹兒再一次學習SSH的時候，在進行使用者名稱校驗的時候，啟動專案報了一個曾經遇到的錯誤：

  Error creating bean with name ‘sessionFactory’ defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.InvalidMappingException: Could not parse mapping document from input stream

  再一次遇到這個問題，而且一看到錯誤內容這麼長，都不知道在哪裡啊！直接就開始上網查。經過網上查詢之後一位博主的話點醒了我，他說在error下面還有一句話，就是這個造成的這個錯誤的原因，同時也說明了解決方法：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is
 
 org.hibernate.InvalidMappingException: Could not parse mapping document from input stream
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1486)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524
 
)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:589)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:383)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5181)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1101)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1816)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from input stream
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:4009)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXmlQueue(Configuration.java:3998)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3986)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1398)
    at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1375)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:720)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:188)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1483)
    ... 25 more
Caused by: org.hibernate.PropertyNotFoundException: field [email] not found on cn.itcast.shop.user.vo.User
    at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:182)
    at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:174)
    at org.hibernate.property.DirectPropertyAccessor.getGetter(DirectPropertyAccessor.java:197)
    at org.hibernate.util.ReflectHelper.getter(ReflectHelper.java:241)
    at org.hibernate.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:229)
    at org.hibernate.mapping.SimpleValue.setTypeUsingReflection(SimpleValue.java:316)
    at org.hibernate.cfg.HbmBinder.createProperty(HbmBinder.java:2297)
    at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:2274)
    at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:2164)
    at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:412)
    at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:326)
    at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:177)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:4006)
    ... 33 more

  明顯的可以看出，在第二個Caused by中：

  原來問題就是我在定義實體的時候忘記寫入email的欄位：

  新增上email欄位後：啟動成功！

  分享：

  在看到報了那麼多錯之後，一定要靜下心來去看在錯誤的後面會有造成這個錯誤的原因，這樣解決其問題就會很快。如果你被這麼多的字打敗了，看到字多就頭疼，先畏懼了，那麼你真的就錯失掉最快發現解決方法的機會了。
今天的分享不在於解決了一個多麼難的問題，而在於發現解決問題有多麼簡單。。