I'm very very sorry for the inconvenience, but anyone familiar with
Code:
HTTP Status 500 - 

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type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: org.apache.struts.action.ActionMessage
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
	org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
	org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
	org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:345)
	org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)


root cause 

java.lang.ClassCastException: org.apache.struts.action.ActionMessage
	org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
	org.apache.jsp.pages.Address_jsp._jspx_meth_html_errors_0(Address_jsp.java:234)
	org.apache.jsp.pages.Address_jsp._jspx_meth_html_form_0(Address_jsp.java:190)
	org.apache.jsp.pages.Address_jsp._jspx_meth_html_html_0(Address_jsp.java:130)
	org.apache.jsp.pages.Address_jsp._jspService(Address_jsp.java:89)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
	org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
	org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
	org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:345)
	org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.


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Apache Tomcat/5.5.9
?

Sorry if this is sooooooooooo boring question but I'm starting Struts with Netbeans. Any post reply is greatly appreciated.