Hi, 

    I follow the steps, installed the same version of xampp and apache tomcat on window 11. But when I tried to open URL loclhost:8080/leadapp, the following exception appeared:

HTTP Status 500 - org.apache.jasper.JasperException: java.lang.NullPointerException: Module 'null' not found.

type Exception report

message org.apache.jasper.JasperException: java.lang.NullPointerException: Module 'null' not found.

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

exception

org.apache.jasper.JasperException: org.apache.jasper.JasperException: java.lang.NullPointerException: Module 'null' not found.
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:502)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:412)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

root cause

org.apache.jasper.JasperException: java.lang.NullPointerException: Module 'null' not found.
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:502)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:430)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
	org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:709)
	org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:680)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:54)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

root cause

java.lang.NullPointerException: Module 'null' not found.
	org.apache.struts.taglib.TagUtils.getModuleConfig(TagUtils.java:755)
	org.apache.struts.taglib.TagUtils.getModuleConfig(TagUtils.java:735)
	org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1098)
	org.apache.struts.taglib.TagUtils.message(TagUtils.java:956)
	org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:224)
	org.apache.jsp.login_jsp._jspx_meth_bean_005fmessage_005f0(login_jsp.java:162)
	org.apache.jsp.login_jsp._jspService(login_jsp.java:100)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
	org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:709)
	org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:680)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:54)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.37 logs.

Apache Tomcat/6.0.37

=================

build.properties

=================

debug=true

app.name = leadapp

webroot.home = WebRoot
webroot.webinf = WebRoot/WEB-INF
java.source.dir = src/java

dist = dist
javac.dest = ${dist}/classes/
jar.dest = ${dist}/lib/

tomcat.home = D:\Tomcat
tomcat.webapps = ${tomcat.home}/webapps
tomcat.work = ${tomcat.home}/work/Standalone/localhost
tomcat.sharedlib = ${tomcat.home}/shared/lib