i m new in java and want to make an enterprise application in java
of mail enableing and when i do the stuff i got an error of

"
Error: 500
Internal Servlet Error:

java.lang.ClassCastException: SendMail
at org.apache.tomcat.core.ServletWrapper.loadServlet
(ServletWrapper.java:180)
at org.apache.tomcat.core.ServletWrapper.handleRequest
(ServletWrapper.java:202)
at org.apache.tomcat.servlets.InvokerServlet.service
(InvokerServlet.java:240)
at javax.servlet.http.HttpServlet.service
(HttpServlet.java:865)
at org.apache.tomcat.core.ServletWrapper.handleInvocation
(ServletWrapper.java:403)
at org.apache.tomcat.core.ServletWrapper.handleRequest
(ServletWrapper.java:224)
at org.apache.tomcat.core.ContextManager.service
(ContextManager.java:347)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection
(HttpConnectionHandler.java:144)
at org.apache.tomcat.service.TcpConnectionThread.run
(TcpEndpoint.java:305)
at java.lang.Thread.run(Thread.java:579)