'Does the place of GetMapping (Spring) matter when we want to return a template to client?

I was writing a Spring Boot application, and whenever the client requested to get "registration.html" template, the server should return it

I first put the GetMapping in my RegistrationController, and it worked, that is, when I access localhost:8080/registration, it does return me that page

@Controller
@RequestMapping("/registration")
public class UserRegistrationController {

    private UserService userService;

    public UserRegistrationController(UserService userService) {
        super();
        this.userService = userService;
    }

    @ModelAttribute("user")
    public UserRegistrationDto userRegistrationDto() {
        return new UserRegistrationDto();
    }

    @GetMapping
    public String registration() {
        return "registration";
    }

    @PostMapping
    public String registerUserAccount(@ModelAttribute("user") UserRegistrationDto registrationDto) {
        userService.save(registrationDto);
        return "redirect:/registration?success";
    }
}

Then I decided to create a template controller, and put all GetMapping for templates there. But then when I try to access localhost:8080/registration again, it gives me an error (type=Internal Server Error, status=500)

@Controller
@RequestMapping
public class TemplateController {

    @GetMapping("/")
    public String home() {
        return "index";
    }

    @GetMapping("/registration")
    public String registration() {
        return "registration";
    }
}

So my question is, does it matter where I put the GetMapping? Or is there are some configurations I needed to fix, so the app knows where to find the GetMapping? But the thing is, the home() method in this TemplateController does return me /index successfully, so I thought it's not to do with this class

The summary of the log file is:

org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor

I think this line below might be the issue

Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute

My registration.html is as below, however the "user" object is only used for the POST request, not GET request for returning the page

<html lang="en" dir="ltr" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org">
<head>
    <meta charset="utf-8">
    <title></title>
</head>
<body>
    
<form th:action="@{/registration}" method="post" th:object="${user}">
    <div class="form-group">
        <label class="control-label" for="name"> Name </label>
        <input id="name" class="form-control" type="text" th:field="*{name}"
               required autofocus="autofocus" />
    </div>

    <div class="form-group">
        <label class="control-label" for="email"> Email </label>
        <input id="email" class="form-control" type="text" th:field="*{email}" required
            autofocus="autofocus" />
    </div>

    <div class="form-group">
        <label class="control-label" for="password"> Password </label>
        <input id="password" class="form-control" type="password"
            th:field="*{password}" required autofocus="autofocus" />
    </div>

    <div class="form-group">
        <button type="submit" class="btn btn-success">Register</button>
        <span>Already registered? <a href="/" th:href="@{/login}">Login
                            here</a></span>
    </div>
</form>
</body>

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source

'Does the place of GetMapping (Spring) matter when we want to return a template to client?

Sources

Related Questions