In spring boot project, When I click submit button, how can I solve Whitelabel Error Page Error, - spring-boot

Question

When I click on submit button I got this error message
Whitelabel Error Page This application has no explicit mapping for
/error, so you are seeing this as a fallback. Tue Jun 30 17:24:02 CST
2015 There was an unexpected error (type=Not Found, status=404). No
message available
Here is my code.
package com.tourpackage.controllers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.tourpackage.model.TourPackage;
import com.tourpackage.repository.TourPackageMongoRepository;
import com.tourpackage.repository.VehicleTypeMongoRepository;
#Controller
public class TourPackageController {
#Autowired
TourPackageMongoRepository packageRepository;
VehicleTypeMongoRepository vehicleTypeRepository;
#RequestMapping("/tourpackage")
public String tourpackage(Model model){
model.addAttribute("packagelist", packageRepository.findAll());
return "index";
}
#RequestMapping("/addNewTour")
public String addNewTour(Model model){
model.addAttribute("packagelist", packageRepository.findAll());
return "tourpack";
}
#RequestMapping(value="/addPackage", method = RequestMethod.POST)
public String addPackage(#ModelAttribute TourPackage tourpack) {
packageRepository.save(tourpack);
return "redirect:tourpackage";
}
}

Answer 1

Spring Boot automatically registers the Basic ErrorController as a Spring Bean when you haven't specified an implementation for ErrorController.
so,
If you want to return customised content for path /error, refer following code:
#RestController
public class MyController implements ErrorController{
private static final String PATH = "/error";
#RequestMapping(value = PATH)
public String error() {
return "Error handling";
}
#Override
public String getErrorPath() {
return PATH;
}
}
Else,
If you want to disable it, you can refer this post:
http://www.logicbig.com/tutorials/spring-framework/spring-boot/disable-default-error-page/