Mapping error for springboot project

[martin codey]

I get this error:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu May 21 18:43:48 CEST 2020
There was an unexpected error (type=Internal Server Error, status=500).
Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "add-customer" - line 39, col 52)

I uploaded the project to github so it would be easier for you to find the problem .
It works fine until I get to the http://localhost:8080/new and then it crashes.
github

[Rob Spoor]

To control over how errors are handled, I suggest you take a look at https://www.baeldung.com/spring-boot-custom-error-page.

However, I'd say the more pressing concern is the actual error. There's apparently something going wrong in your 'add-customer.htm' Thymeleaf template, on line 39, column 52. The logs should show you more information, but that's where you now need to focus on first.

[Himai Minh]

Hi,
You need a setter for the SSN in your Customer. Also, I need to change SSN type from Double to String
Also, you need to fix the spelling the CityOfResidence:

public String getSsn() {return this.ssn;}

//fix the spelling of the parameter from CountrOfResidence
 public void setCountryOfResidence(String CountryOfResidence) {
    this.CountryOfResidence = CountryOfResidence;
}

//Should return Cityof Residence instead of CountryOfResidence
public String getCityOfResidence() {
    return CityOfResidence;
}

 
}

But one thing is the update customer does not update anything. I need some help to figure out way.

[Himai Minh]

One more fix for your UpdateUser:

@PostMapping("/update/{id}")
    public String updateUser(@PathVariable("id") long id, @ModelAttribute Customer customer , BindingResult result, Model model) {
        Customer customerToUpdate = customerRepository.findById(id).get();
         System.out.println("Found customer " + id);
         String newemail = customer.getEmail();
         String newName = customer.getName();
         String newSurname = customer.getSurname();
         customerToUpdate.setEmail(newemail);
         customerToUpdate.setName(newName);
         customerToUpdate.setSurname(newSurname);
         customerRepository.save(customerToUpdate);

        model.addAttribute("customers", customerRepository.findAll());
        System.out.println("New email" +customerRepository.findById(1L).get().getEmail());
        return "index";
    }

The reason for the changes:
Binding Result always return an error in the original code because your customer in the update form does not have city of residence, ssn, country of residence , gender. It always returns binding result error.
It is a validation error.
In this case, we don't really need to validate.
And in this new method, we should pass the a customer model attribute to the Thymleaf form. The customer has updated/same email, name, surname. Then, save the updated information.