About the Web.xml error solution __web

Serious: Parse Error at line column 11:the content of element type Web-app "must match" (icon?,display-name?,description?, Distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?, mime-mapping*,welcome-file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*, login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*) "

Most of the opinion on the Internet is that the nodes should be added strictly in the order of icon?,display-name?,description?,distributable and so on. After careful comparison with this method, the error finally disappeared. There is also a saying that the <! DOCTYPE Web-app Public "-//sun Microsystems, INC.//DTD Web Application 2.3//en" "Http://java.sun.com/dtd/web-app_2_3. DTD "> This section of the checksum code is deleted, the problem is solved. The reason: Some of the code you add is compliant with the XML document specification, but does not conform to the specification defined by WEB-APP_2_3.DTD. But have not encountered this kind of situation, keep standby. Copy to Google Translate translation results