Struts2和Tiles:当apache.org关闭时,我的webapp无法启动

Question

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,即如果apache.org关闭(这似乎经常发生)Web应用程序无法启动.这是因为在其标准设置中,StrutsTilesListener尝试加载tiles defenitions文件,该文件包含一个带有public-id的DOCTYPE,该公共id指向位于tiles.apache.org上的DTD.

当应用程序启动时,使用Apache Xerces通过Apache Commons Digester加载定义文件,该文件尝试从tiles.apache.org加载DTD但是如果apache.org关闭则会失败并且随之而来的是整个Web应用程序无法启动.

我可以通过下载文件并将其置于本地并在struts定义文件中指定新的本地位置来绕过远程位置的下载,但是这个解决方案不是很便携,因为本地保存DTD的位置可能会有所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,以便运行webapp运行的机器,这简直是烦人的.

项目中没有其他xml文件存在此问题,包括struts.xml文件,该文件在apache.org上也有DTD位置,所以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.这有什么解决方案吗？我已经没有耐心了,我不能把这个webapp知道,如果我重新启动apache.org,那么webapp就不会再回来了.

Struts tile defenition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>

当apache.org关闭时,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

Answer 1

我发现了这个问题并且这是我的错,我在问题中说的一切都是真的但是这只是真的,因为在tiles.xml文件中声明的DTD版本和我正在使用的tile版本之间存在不匹配.

我实际上正在使用Tiles 2.0.6,但是从磁贴2.1引用了DTD,因此磁贴不会引用捆绑的DTD并尝试下载它.

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">

本来应该

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">