Tomcat启动报错java.net.AbstractPlainSocketImpl(java/net/AbstractPlainSocketImpl.java

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SSH项目
在网络复杂的情况（具体规律未知）下，Tomcat启动时，报如下错误：
[ERROR] 2014-08-12 14:52:58,484 [org.apache.struts2.dispatcher.Dispatcher :27] - Dispatcher initialization failed
Unable to load configuration. - Class: java.net.AbstractPlainSocketImpl
File: AbstractPlainSocketImpl.java
Method: connect
Line: 178 - java/net/AbstractPlainSocketImpl.java:178:-1
        at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
        at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:374)
        at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418)
        at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
        at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
        at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
        at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
        at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
        at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4363)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
        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:516)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: Unable to load file:/E:/Work/workspace/ws4szzt71/TheThirdAffiliatedHospitalOfSunYatsenUniversity/WebRoot/WEB-INF/classes/struts.xml - Class: java.net.AbstractPlainSocketImpl
File: AbstractPlainSocketImpl.java
Method: connect
Line: 178 - java/net/AbstractPlainSocketImpl.java:178:-1
解决方法如下：
报错信息提示无法load：struts.xml文件。
查看struts.xml文件的DOCTYPE定义发现版本与struts2-core-2.1.8.1.jar不一致，作如下修改：
将struts.xml中的声明部分修改为工程所用jar包struts2-core-2.1.8.1.jar中struts-default.xml的文件声明即可。
即
将：<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd">
修改为：<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "http://struts.apache.org/dtds/struts-2.1.7.dtd">