严重: Parse Error at line 291 column 12: 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*,securityconstraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)".
如果是web-app 版本是2.4
<taglib>外面要加个<jsp-config></jsp-config>