若不能上网，则手动配置一下：
eclipse preferces xml xml-catalog add..　选URI，location选FileSystem指定到　spring解压目录的dist/resources/spring-beans-2.5.xsd
schema location, key值为http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
<bean name="s/ss/sss" /> id时不能使用/