Spring java based configuration for custom error pages

I have created a CustomErrorHandler

bean that extends org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver

as a replacement for xml based config to handle custom error pages. The bean class is registered internally WebInitializer

which is equivalent web.xml

. The problem is that I am unable to view the custom error pages I developed when the "404" exception occurred, or any of the ones that I configured to handle in the bean class.

This is the code for my CustomErrorHandler

bean class and WebInitializer

:

CustomErrorHandler.java:

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver;

public class CustomHandlerExceptionResolver extends DefaultHandlerExceptionResolver {


    private static final Logger logger = LoggerFactory
            .getLogger(CustomHandlerExceptionResolver.class);

    @Override
    protected ModelAndView doResolveException(HttpServletRequest request,
                                              HttpServletResponse response,
                                              Object handler,
                                              Exception ex) {
        try {

            if (ex instanceof java.lang.Throwable) {

                return new ModelAndView("redirect:/uncaughtException");
            } else if (ex instanceof java.lang.Exception) {

                return new ModelAndView("redirect:/uncaughtException");
            } else if (response.getStatus()==404) {

                return new ModelAndView("redirect:/resourceNotFound");
            } else if (response.getStatus()==500) {

                return new ModelAndView("redirect:/resourceNotFound");
            }             //end webflow
            //error 500
            else if (ex instanceof org.springframework.context.ApplicationContextException) {
                logger.warn("applicationcontextexception");
                return new ModelAndView("redirect:/resourceNotFound");
            }
            //end error 500

            //default
            return super.doResolveException(request, response, handler, ex);
        }
        catch (Exception handlerException) {
            logger.warn("Handling of [" + ex.getClass().getName() + "] resulted in Exception", handlerException);
        }
        return null;
    }


}

      

        
        
        
      

    

WebInitializer.java:

import java.util.EnumSet;
import java.util.Set;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration.Dynamic;
import javax.servlet.SessionTrackingMode;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.security.web.session.HttpSessionEventPublisher;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.DelegatingFilterProxy;
import org.springframework.web.servlet.DispatcherServlet;

import com.knowesis.sift.service.util.PropertyFileReader;

public class WebInitializer implements WebApplicationInitializer {


    @Autowired
    PropertyFileReader propertyfilereader;



    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {

        Set<SessionTrackingMode> modes = EnumSet.noneOf(SessionTrackingMode.class);
        modes.add(SessionTrackingMode.COOKIE);

        AnnotationConfigWebApplicationContext ctx=new AnnotationConfigWebApplicationContext();
       // ctx.register(PropertyFileReaderConfig.class);
       //   ctx.register(RootContext.class);
        ctx.register(SecurityConfig.class);
        servletContext.addListener(new ContextLoaderListener(ctx));
        servletContext.addListener(new HttpSessionEventPublisher());
        //servletContext.addFilter("springExceptionFilter",ExceptionInterceptor.class);
        servletContext.addFilter("springSecurityFilterChain",DelegatingFilterProxy.class);
        servletContext.setSessionTrackingModes(modes);
        AnnotationConfigWebApplicationContext dispatcherContext=new AnnotationConfigWebApplicationContext();
        dispatcherContext.register(ServletContextInitializer.class);

/**
here i have registered the custom handler
*/      
dispatcherContext.register(CustomHandlerExceptionResolver.class);

        Dynamic servlet=servletContext.addServlet("appServlet",new DispatcherServlet(dispatcherContext));
        servlet.addMapping("/");
        servlet.setLoadOnStartup(1);


    }

}

      

        
        
        
      

    

Do I need to use any Handler class provided by spring or change my current configuration? I also may have made a stupid mistake, so please forgive as I am new to spring framework.