无意间struts应用在有网络的情况下启动正常，在断网的情况下启动报错，报错代码如下图所示：

  1. SEVERE: Exception starting filter struts2
  2. Class: java.net.AbstractPlainSocketImpl
  3. File: AbstractPlainSocketImpl.java
  4. Method: connect
  5. Line: 178 - java/net/AbstractPlainSocketImpl.java:178:-1
  6.     at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:835)
  7.     at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:131)
  8.     at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:100)
  9.     at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:130)
  10.     at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
  11.     at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
  12.     at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
  13.     at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201)
  14.     at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
  15.     at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
  16.     at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
  17.     at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4746)
  18.     at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5399)
  19.     at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
  20.     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
  21.     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
  22.     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
  23.     at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)
  24.     at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1636)
  25.     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
  26.     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
  27.     at java.util.concurrent.FutureTask.run(FutureTask.java:166)
  28.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
  29.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  30.     at java.lang.Thread.run(Thread.java:722)
  31. Caused by: struts.apache.org - Class: java.net.AbstractPlainSocketImpl
  32. File: AbstractPlainSocketImpl.java
  33. Method: connect
  34. Line: 178 - java/net/AbstractPlainSocketImpl.java:178:-1
  35.     at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:123)
  36.     at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:830)
  37.     ... 24 more
  38. Caused by: java.net.UnknownHostException: struts.apache.org
  39.     at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
  40.     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
  41.     at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
  42.     at java.net.Socket.connect(Socket.java:579)
  43.     at java.net.Socket.connect(Socket.java:528)
  44.     at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
  45.     at sun.net.www.http.HttpClient.openServer(HttpClient.java:378)
  46.     at sun.net.www.http.HttpClient.openServer(HttpClient.java:473)
  47.     at sun.net.www.http.HttpClient.<init>(HttpClient.java:203)
  48.     at sun.net.www.http.HttpClient.New(HttpClient.java:290)
  49.     at sun.net.www.http.HttpClient.New(HttpClient.java:306)
  50.     at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:995)
  51.     at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:931)
  52.     at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:849)
  53.     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1299)
  54.     at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:632)
  55.     at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1270)
  56.     at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1237)
  57.     at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:260)
  58.     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1153)
  59.     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1049)
  60.     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:962)
  61.     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:607)
  62.     at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116)
  63.     at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:489)
  64.     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835)
  65.     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
  66.     at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
  67.     at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
  68.     at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
  69.     at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:302)
  70.     at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:121)
  71.     ... 25 more
  72. 三月 20, 2014 9:25:36 上午 org.apache.catalina.core.StandardContext startInternal

查看struts.xml文件的DOCTYPE定义如下：

  1.  <!DOCTYPE struts PUBLIC
  2.  "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
  3.  "http://struts.apache.org/dtds/struts-2.1.dtd">

再查看xwork的jar包是2.0的，所以将DOCTYPE的定义也改成2.0的即可

  1.  <!DOCTYPE struts PUBLIC
  2.  "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
  3.  "http://struts.apache.org/dtds/struts-2.0.dtd">

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