No bean named 'sessionFactory' is defined

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今天在配置openSessionInView时,tomcat启动并没有报错,但是发送请求时却报错,如下:

org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'sessionFactory' is definedorg.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:387)org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:971)org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246)org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:168)org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:884)org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.lookupSessionFactory(OpenSessionInViewFilter.java:243)org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.lookupSessionFactory(OpenSessionInViewFilter.java:227)org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:171)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

也不知道怎么的,鬼使神差的我去web.xml配置文件中加了一点配置,问题就解决了,如下:

<init-param>  <param-name>sessionFactoryBeanName</param-name>  <param-value>mysessionfactory</param-value>//sessionFactory的bean的id</init-param>

为什么会这样我也不知道,还望请教