@Entity // This tells Hibernate to make a table out of this class
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;


    private String name;

    private String email;

    private String username;

    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) throws DataFormatException {
        if(name.equals(""))
        {
            throw new DataFormatException("Mpla Mpla");
        }
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {

        this.email = email;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @JsonCreator
    public User(@JsonProperty("name") String name, @JsonProperty("email") String email,@JsonProperty("username") String username,@JsonProperty("password") String password) throws DataFormatException {
        setName(name);
        this.email = email;
        this.username = username;
        this.password = password;
}
    }

public class MainController {
    @Autowired // This means to get the bean called userRepository
    // Which is auto-generated by Spring, we will use it to handle the data
    private UserRepository userRepository;
    }
    @PostMapping(path="/add") // Map ONLY POST Requests
    public @ResponseBody String addNewUser (@RequestBody @Valid User user1) {
        // @ResponseBody means the returned String is the response, not a view name

        userRepository.save(user1);
        return "Saved";
    }

    @GetMapping(path="/all")
    public @ResponseBody Iterable<User> getAllUsers() {
        // This returns a JSON or XML with the users
        return userRepository.findAll();
    }

"exception": "org.springframework.http.converter.HttpMessageNotReadableException",
    "message": "JSON parse error: Can not construct instance of hello.Users.User, problem: Mpla Mpla; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of hello.Users.User, problem: Mpla Mplan at [Source: java.io.PushbackInputStream@7604dc21; line: 6, column: 1]",