How can I resolve this issue, I am unable to access my controller class methods from Postman or Browser?

I am running a simple Spring boot application, In console its running successfully. But when I am trying by postman it gives this error message.

{
"timestamp": "2020-07-26T04:22:15.626+00:00",
"status": 404,
"error": "Not Found",
"message": "",
"path": "/loginRegistration/user/"

}

My project structure is...

My Main class is

import org.example.controller.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
        System.out.println("Welcome");
    }
}

My Controller is....

import com.fasterxml.jackson.core.JsonProcessingException;
import org.example.entity.Registration;
import org.example.model.UserDto;
import org.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user")
public class User {
    @Autowired
    UserService userService;

    @RequestMapping(value = "/registration", method = RequestMethod.POST)
    public String registerUser(@Validated UserDto userdto) throws JsonProcessingException {
        userService.registerUser(userdto);
        return "success";
    }

    @RequestMapping(value = "/getUserList", method = RequestMethod.GET)
    public List<Registration> getUserList() {
        List<Registration> list = userService.getUserList();
        return list;

    }

    @RequestMapping(value = "/")
    public String test() {
        return "testing";
    }
}

Please guide me what changes need to be done to run on postman.

> spring application name does not use as context path. You will have to
> define below property in your application.properties file to use
> 'loginRegistration' as your context path.

server.servlet.context-path=/loginRegistration

And now you can use it as /loginRegistration/user/

Let me know if that helps. Thanks

You have to make sure, you providing war name along with your given URL... And see packages should be under you main class... if not u have to add in main class using componentscan

Another alternative to what @Jimmy described is to define @RequestMapping in your User class as -

@RestController
@RequestMapping("/loginRegistration/user/")
public class User {