org.springframework.beans.factory.BeanCreationException: Error creating bean with name 解决办法

本人在运行idea Demo时出出现的

Exception encountered during context initialization - cancelling refresh attempt

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0': Invocation of init method failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException:

后面的错误也是围绕这两个

.CannotLoadBeanClassException

 UnsupportedClassVersionError:

打开Java  Compiler

file----->settings---->Build,Execution,Deployment------>Compiler----->Java  Compiler

修改JDK原先1.8版本为1.6或者1.7 再次运行后  成功。

另外本人Tomcat 版本为7

具体原因不了解，希望有大神可以交流交流，