Plz help why its not compiling ,

hello all i am trying to make the tutorial http://developers.sun.com/mobility/midp/articles/tutorial2/
i have made all the steps once i try to compile it it shows the folowing error:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Wrapper cannot find servlet class HitServlet or a class it depends on
     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:836)
     at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:613)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:164)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
etc.....
i believe the error has something to do with my classpath thats why its not compiling the HitServlet.java
if anybody can show me plz how to make this following step :
Compiling the Servlet
Compiling servlet code is pretty much the same as for other Java development, except for an important twist. Because the servlet API is not a core part of the Java SE platform, you'll need to add it to your CLASSPATH before you can compile servlets.
The servlet API is contained in common/lib/servlet.jar under the Tomcat root directory. Simply add this file to your CLASSPATH and you will be able to compile HitServlet.java using javac. You can edit the CLASSPATH in the system properties or do it on the command line, as this Windows example demonstrates:
C:\>set CLASSPATH=\jakarta-tomcat-4.1.31\common\lib\servlet.jar
C:\>javac HitServlet.java
i have installed the tomcat and its working fine but i dont understand how to set the classpath , i tried to make it in control panel / system / envirement and put the classpath but its still doesnt work
please help on what i should make in my classpath and how to set it to work if not please notify me where am i making mistake thank you
appreciate a lot help

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