Java EE (Java Enterprise Edition) General Discussion

I am having a following error when a request is made to my Login servlet......

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

exception

javax.servlet.ServletException: Error instantiating servlet class udit.Login
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:556)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:401)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
java.lang.Thread.run(Thread.java:619)

root cause

java.lang.NoClassDefFoundError: udit/Login (wrong name: Login)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
java.lang.ClassLoader.defineClass(ClassLoader.java:616)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2778)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1139)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1633)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1511)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:556)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:401)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
java.lang.Thread.run(Thread.java:619)

......

PLZZ Suggest me what am i doing wrong
I compiled my servlet sucessfully so problem should not be with coding
I think that some jar files may be required BUT EVEN IF I DO THEN PLZZZ TEMME WHICH ALL JAR FILES ARE REQUIRED FOR SERVLETS AND JDBC TO WORK PROPERLY....... I AM USING TOMCAT (latest).... I hav set all the classpaths and other environment variables..... PLZZ HELP ME OUT>......