how to implement a front controller?

[Maciek Zywno]

hello   I wanted to write a simple front controller. As for now it is to do nothing else than just take a look inside a request, check what page a client wants to see and just forward a request to an appropriate page. Is it possible? In my web.xml I put mapping for all requests to be checked by my front controller: <servlet>     <servlet-name>FrontController</servlet-name>     <servlet-class>frontController</servlet-class> </servlet> <servlet-mapping>     <servlet-name>FrontController</servlet-name>     <url-pattern>/*</url-pattern> </servlet-mapping>   in doProcess:   String urlTarget = request.getgetPathInfo(); RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(urlTarget); dispatcher.forward( request, response );   when I try to visit any page in my webapp I get the error java.lang.ClassCastException at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:243) .....                 at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)                 .... Do you have any idea of what is wrong with my piece of code? thanks in advance