What is the contents of Helloworld.war? If Helloworld.war is a file, list its content using jar -l, otherwise do a dir, and post the results.
What URL ar you using?
Based on your post, it order for things to work, Helloworld.war should contain a file named helloworld.jsp and you should access it via the URL "http://localhost:8080/Helloworld/helloworld.jsp" (note the casing!)
See also http://www.jboss.com/index.html?module=bb&op=viewtopic&t=71289
Thank you for your response and the link.
It's working now!
I had the helloworld.jsp in the Helloworld.war folder and used the
But, It seems I had "Helloworld.jsp" and an extra "<" in the web.xml file.