tomcat 七: IllegalArgumentException: taglib definition not consistent with specif

tomcat 7: IllegalArgumentException: taglib definition not consistent with specif
tomcat7，部署tomcat6下的项目统，报tomcat 7: IllegalArgumentException: taglib definitionnotconsistentwithspecificationversion错误，
查看日志发现，是web.xml下引入taglib标签的方式有了新的配置要求。
tomcat7.0前版本web.xml中taglib配置如下：
<web-app>
     <taglib>
        <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
        <taglib-location>/WEB-INF/fmt.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://java.sun.com/jstl/fmt_rt</taglib-uri>
        <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
    </taglib>
</web-app>
tomcat7.0后版本taglib配置如下：
<web-app>
<jsp-config>
     <taglib>
        <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
        <taglib-location>/WEB-INF/fmt.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://java.sun.com/jstl/fmt_rt</taglib-uri>
        <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
    </taglib>
</jsp-config>
</web-app>