I installed tomcat engine , it work fine with the servlets but it give me 
errors when I use it with JSP , for example when I tried it with the 
examples that come with tomact itself , it give me the following 
exception :


  javax.servlet.ServletException: num/NumberGuessBean
	at org.apache.jasper.servlet.JspServlet.service
(JspServlet.java:415)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService
(ServletWrapper.java:404)
	at org.apache.tomcat.core.Handler.service(Handler.java:286)
	at org.apache.tomcat.core.ServletWrapper.service
(ServletWrapper.java:372)
	at org.apache.tomcat.core.ContextManager.internalService
(ContextManager.java:797)
	at org.apache.tomcat.core.ContextManager.service
(ContextManager.java:743)
	at 
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection
(HttpConnectionHandler.java:210)
	at org.apache.tomcat.service.TcpWorkerThread.runIt
(PoolTcpEndpoint.java:416)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run
(ThreadPool.java:498)
	at java.lang.Thread.run(Thread.java:484)

Root cause: 
java.lang.NoClassDefFoundError: num/NumberGuessBean
	at java.lang.Class.newInstance0(Native Method)
	at java.lang.Class.newInstance(Class.java:237)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.load
(JspServlet.java:123)
	at 
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary
(JspServlet.java:161)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service
(JspServlet.java:171)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile
(JspServlet.java:328)
	at org.apache.jasper.servlet.JspServlet.service
(JspServlet.java:407)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService
(ServletWrapper.java:404)
	at org.apache.tomcat.core.Handler.service(Handler.java:286)
	at org.apache.tomcat.core.ServletWrapper.service
(ServletWrapper.java:372)
	at org.apache.tomcat.core.ContextManager.internalService
(ContextManager.java:797)
	at org.apache.tomcat.core.ContextManager.service
(ContextManager.java:743)
	at 
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection
(HttpConnectionHandler.java:210)
	at org.apache.tomcat.service.TcpWorkerThread.runIt
(PoolTcpEndpoint.java:416)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run
(ThreadPool.java:498)
	at java.lang.Thread.run(Thread.java:484)