title: There is no Action mapped for namespace / and action name HelloWorld
body: <p>I am trying to run a simple struts 2 HelloWorld application ,when i run it ,says "There is no Action mapped for namespace / and action name HelloWorld.Can somebody please help.</p>
  
  <pre><code>WARNING: Could not find action or result
  There is no Action mapped for namespace / and action name HelloWorld. - [unknown location]
      at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:189)
      at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
      at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
      at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
      at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
      at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
      at java.lang.Thread.run(Unknown Source)
  </code></pre>