我正在构建一个使用磁贴的 Struts2 Web 应用程序，但是我发现了一个非常令人沮丧的问题，如果 apache.org 关闭（这似乎经常发生），Web 应用程序将无法启动。这是因为在其标准设置中，StrutsTilesListener 会尝试加载包含 DOCTYPE 的切片定义文件，该文件具有指向位于 tiles.apache.org 上的 DTD 的 public-id。
当应用程序启动时，定义文件是通过 Apache Commons Digester 使用 Apache Xerces 加载的，它尝试从 tiles.apache.org 加载 DTD，但是如果 apache.org 关闭，那么这将失败并且整个 Web 应用程序将无法启动。
我可以通过下载文件并将其放置在本地并在struts定义文件中指定新的本地位置来绕过远程位置的下载，但是此解决方案不是很便携，因为本地保存DTD的位置可能不同开发人员机器和不同的一旦上传到实时环境，所以我将不得不继续编辑位置，以便适合运行 webapp 的机器，这简直是烦人的。
项目中没有其他 xml 文件有这个问题，包括 struts.xml 文件，它在 apache.org 上也有一个 DTD 位置，因此很明显存在一个设置问题，其中 Tiles 严格要求 DTD，但其他组件不是。有什么解决办法吗？我已经没有耐心了，我无法让这个 webapp 上线，因为我知道如果 apache.org 在我重新启动它时关闭，webapp 将不会重新启动。
Struts tile 定义文件
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE tiles-definitions PUBLIC
"-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
"http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
<tiles-definitions>
<definition name="master" template="/tiles/templates/master.jsp">
</definition>
<definition name="public" extends="master">
<put-attribute name="header" value="/tiles/templates/public/header.jsp" />
<put-attribute name="footer" value="/tiles/templates/public/footer.jsp" />
<put-attribute name="templateMeta" value="/tiles/templates/public/meta.jsp" />
</definition>
</tiles-definitions>
apache.org 关闭时的堆栈跟踪
SEVERE: Exception sending context initialized event to listener instance of class org.apache.struts2.tiles.StrutsTilesListener
java.lang.IllegalStateException: Unable to instantiate container.
at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:60)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.apache.tiles.definition.DefinitionsFactoryException: I/O Error reading definitions.
at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:273)
at org.apache.tiles.definition.UrlDefinitionsFactory.readDefinitions(UrlDefinitionsFactory.java:286)
at org.apache.tiles.definition.UrlDefinitionsFactory.init(UrlDefinitionsFactory.java:130)
at org.apache.tiles.impl.BasicTilesContainer.initializeDefinitionsFactory(BasicTilesContainer.java:406)
at org.apache.tiles.impl.BasicTilesContainer.init(BasicTilesContainer.java:130)
at org.apache.tiles.factory.TilesContainerFactory.initializeContainer(TilesContainerFactory.java:232)
at org.apache.tiles.factory.TilesContainerFactory.createTilesContainer(TilesContainerFactory.java:198)
at org.apache.tiles.factory.TilesContainerFactory.createContainer(TilesContainerFactory.java:163)
at org.apache.tiles.web.startup.TilesListener.createContainer(TilesListener.java:90)
at org.apache.struts2.tiles.StrutsTilesListener.createContainer(StrutsTilesListener.java:68)
at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:57)
... 15 more
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at org.apache.commons.digester.Digester.createInputSourceFromURL(Digester.java:2072)
at org.apache.commons.digester.Digester.resolveEntity(Digester.java:1725)
at com.sun.org.apache.xerces.internal.util.EntityResolverWrapper.resolveEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntityAsPerStax(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1887)
at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:267)
... 25 more