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https://issues.apache.org/jira/browse/WW-5150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454985#comment-17454985
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Lukasz Lenart commented on WW-5150:
-----------------------------------
It's related to a bug in older version of Tomcat/SAX. XML parser tries to
validate the XML using remote DTD even if local copy in JAR is already provided
and it tries to fetch the DTD from http://struts.apache.org/dtds/struts-2.0.dtd
- yet Apache disabled access over http:// to all the sites and sends redirect
(HTTP 302) to use https:// - but probably the parser cannot handle it. You can
check that the version under https:// is available:
https://struts.apache.org/dtds/struts-2.0.dtd
> Element type "struts" must be declared
> --------------------------------------
>
> Key: WW-5150
> URL: https://issues.apache.org/jira/browse/WW-5150
> Project: Struts 2
> Issue Type: Bug
> Reporter: Paniagua
> Priority: Major
>
> Buenas tardes,
>
> nos ha ocurrido un problema el fin de semana que nos impedía acceder a la
> aplicación.
> El error en el log es:
> Element type "struts" must be declared. at (null:28:9)
> org.xml.sax.SAXParseException; systemId:
> jar:file:/var/apache-tomcat-7.0.85/webapps/oegam2/WEB-INF/lib/struts2-spring-plugin-2.3.8.jar!/struts-plugin.xml;
> lineNumber: 28; columnNumber: 9; Element type "struts" must be declared.
> En nuestro struts-plugin.xml tenemos la llamada indicado
> <!DOCTYPE struts PUBLIC
> "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
> "http://struts.apache.org/dtds/struts-2.0.dtd";>
>
> De esta forma debería ir a la URL y descargar el dtd pero nos da ese error
> anterior indicado.
> Para solventarlo tuvimos que modificar el jar y añadirle al mismo nivel el
> .DTD y quitar la llamada a la URL dejando el nombre nada mas
> <!DOCTYPE struts PUBLIC
> "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
> "struts-2.0.dtd">
>
> Nos podrían indicar a que se debe ese problema?
>
> Muchas gracias
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