使用 retrofit 登录：（android 中的 500 内部错误）

Question

I create login with spring boot api. When I try in postman, the server work fine. But when I tried to implement in my android app, it going failed. It's keep me the error 500 in android and java.lang.NullPointerException: null in my server. Can some one help me?

Logcat

06-24 19:32:31.490 15836-15836/com.test.restapitest E/errorResponse: {"timestamp":"2020-06-24T12:32:29.402+00:00","status":500,"error":"Internal Server Error","message":"","path":"/user/login"}

Model

public class User {

    @SerializedName("id")
    @Expose
    private int id;

    @SerializedName("email")
    @Expose
    private String email;

    @SerializedName("password")
    @Expose
    private String password;
}

Interface

public interface ApiInterface {

    @POST("/user/login")
    Call<User> login(@Body User user);
}

This is the login method in my activity

public void getLogin(User user){
    ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
    Call<User> call = apiService.login(user);

    call.enqueue(new Callback<User>() {
        @Override
        public void onResponse(Call<User> call, Response<User> response) {
            User user = new User();
            String email = etEmail.getText().toString();
            String password = etPassword.getText().toString();
            if((email.equals(user.getEmail()) && password.equals(user.getPassword())){
                Intent intents = new Intent(UserActivity.this, MainActivity.class);
                startActivity(intents);
            }else{
                Snackbar.make(nestedScrollView, getString(R.string.error_valid_email_password), Snackbar.LENGTH_LONG).show();
            }

        }

        @Override
        public void onFailure(Call<User> call, Throwable t) {
            Log.d("TAG","Response = "+t.toString());
        }
    });

Answer 1

I create login with spring boot api. When I try in postman, the server work fine. But when I tried to implement in my android app, it going failed. It's keep me the error 500 in android and java.lang.NullPointerException: null in my server. Can some one help me?

Logcat

06-24 19:32:31.490 15836-15836/com.test.restapitest E/errorResponse: {"timestamp":"2020-06-24T12:32:29.402+00:00","status":500,"error":"Internal Server Error","message":"","path":"/user/login"}

Model

public class User {

    @SerializedName("id")
    @Expose
    private int id;

    @SerializedName("email")
    @Expose
    private String email;

    @SerializedName("password")
    @Expose
    private String password;
}

Interface

public interface ApiInterface {

    @POST("/user/login")
    Call<User> login(@Body User user);
}

This is the login method in my activity

public void getLogin(User user){
    ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
    Call<User> call = apiService.login(user);

    call.enqueue(new Callback<User>() {
        @Override
        public void onResponse(Call<User> call, Response<User> response) {
            User user = new User();
            String email = etEmail.getText().toString();
            String password = etPassword.getText().toString();
            if((email.equals(user.getEmail()) && password.equals(user.getPassword())){
                Intent intents = new Intent(UserActivity.this, MainActivity.class);
                startActivity(intents);
            }else{
                Snackbar.make(nestedScrollView, getString(R.string.error_valid_email_password), Snackbar.LENGTH_LONG).show();
            }

        }

        @Override
        public void onFailure(Call<User> call, Throwable t) {
            Log.d("TAG","Response = "+t.toString());
        }
    });