I create a web application using struts2, including all struts2 jar files in WEB-INF/lib
This war file runs well on resin 3.1/jdk1.5 at my PC.
But the application throws following exception after I upload this WAR file to lunarpages server.

500 Servlet Exception

java.lang.NullPointerException
   at com.caucho.xml.QAttributedNode.getAttributeNodeNS(QAttributedNode.java:146)
   at com.opensymphony.xwork2.util.location.LocationAttributes.getLocation(LocationAttributes.java:170)
   at com.opensymphony.xwork2.util.location.LocationAttributes.getLocation(LocationAttributes.java:183)
   at com.opensymphony.xwork2.util.location.LocationUtils.getLocation(LocationUtils.java:253)
   at com.opensymphony.xwork2.util.location.LocationUtils.getLocation(LocationUtils.java:202)
   at com.opensymphony.xwork2.XWorkException.<init>(XWorkException.java:91)
   at com.opensymphony.xwork2.config.ConfigurationException.<init>(ConfigurationException.java:74)
   at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:208)
   at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:101)
   at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:131)
   at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
   at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
   at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
   at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201)
   at com.caucho.server.dispatch.FilterManager.createFilter(FilterManager.java:127)
   at com.caucho.server.dispatch.FilterMapper.buildDispatchChain(FilterMapper.java:167)
   at com.caucho.server.webapp.Application.buildInvocation(Application.java:1680)
   at com.caucho.server.webapp.ApplicationContainer.buildInvocation(ApplicationContainer.java:672)
   at com.caucho.server.host.Host.buildInvocation(Host.java:515)
   at com.caucho.server.host.HostContainer.buildInvocation(HostContainer.java:296)
   at com.caucho.server.resin.ServletServer.buildInvocation(ServletServer.java:550)
   at com.caucho.server.dispatch.DispatchServer.buildInvocation(DispatchServer.java:175)
   at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:380)
   at com.caucho.server.port.TcpConnection.run(TcpConnection.java:327)
   at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:450)
   at com.caucho.util.ThreadPool.run(ThreadPool.java:394)
   at java.lang.Thread.run(Thread.java:595)

Resin-3.0.s041002 (built Sat, 02 Oct 2004 04:47:31 PDT)