org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'userMapper' is defined at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(Defaul

重点是这一句：No bean named 'userMapper' is defined at org.springframework.beans

意思就是找不到指定的bean，可能是指定的gebean("userMapper")里面的名字写错，或者是ApplicationContext.xml中的bean的id属性名写错