struts异常Document is invalid: no grammar found

struts错误Document is invalid: no grammar found

因为在struts.xml文件中缺少了DOCTYPT定义，在文件中加入：

<!DOCTYPE struts-config PUBLIC

?????? "-//Apache Software Foundation//DTD Tiles Configuration 1.1//EN"

?????? "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">即可。