help on starting struts-menu

I have just downloaded struts-menu and copied struts-menu.war in the
Tomcat webapps directory. Trying to access the application from my
browser shows the following exception:

org.apache.jasper.JasperException: object may not be null
	at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:207)
	at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:445)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:534)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:994)
	at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1105)
	at java.lang.Thread.run(Thread.java:595)

root cause

java.lang.NullPointerException: object may not be null
	at
org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:196)
	at
org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:187)
	at
net.sf.navigator.taglib.UseMenuDisplayerTag.doStartTag(UseMenuDisplayerTag.java:223)
	at
org.apache.jsp.index_jsp._jspx_meth_menu_useMenuDisplayer_0(index_jsp.java:127)
	at org.apache.jsp.index_jsp._jspService(index_jsp.java:82)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)
	at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:445)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:534)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:994)
	at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1105)
	at java.lang.Thread.run(Thread.java:595)

I didn't find this in the FAQs or the list archives, any help how to
let it work? Thank you.

Fabrizio


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