spring3中的<aop:aspectj-autoproxy />问题？

Error creating bean with name 'u' defined in file [D:\MyEclipse\Spring_test_aop_annotatuon\WebRoot\WEB-INF\classes\com\bjsxt\dao\impl\UserDAOImpl.class]: Initialization of bean failed;
创建了一个错误的bean名字叫U在UserDAOImpl.class文件中初始化失败