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Why I am not getting error message in postman using Spring Boot Application

I want “Admin not found” message to display in Postman during invalid login but I am getting this as postman output

{
    "timestamp": "2020-05-19T13:59:01.172+00:00",
    "status": 404,
    "error": "Not Found",
    "message": "",
    "path": "/api/adminLogin"
}

AdminController.java

    @RestController
    @RequestMapping("/api")
    public class AdminController {

    @Autowired
    UserRepository userRepository; 

    @PostMapping("/adminLogin")
    public User login(@RequestBody User user) throws ResourceNotFoundException {

        User user1 = userRepository.findByUserName(user.getUserName());
        if(user1 != null && user1.getRole().equalsIgnoreCase("admin")) {
            return user1;
        }
        else 
        {
            throw new ResourceNotFoundException("Admin not found");
        }
    }

ResourceNotFoundException.java

@ResponseStatus(HttpStatus.NOT_FOUND)
public class ResourceNotFoundException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public ResourceNotFoundException() {
        super();
    }

    public ResourceNotFoundException(String message) {
        super(message);
    }

    public ResourceNotFoundException(String message, Throwable cause) {
        super(message, cause);
    }
}

My Postman URL http://localhost:8989/api/adminLogin

My admin login success is working fine

Answer

I solved the problem by including the below code in application.properties file

server.error.include-message = always