CODEWITHSUNDEEP
androidrestretrofitretrofit2
Lending Square
Lending Square

Reputation: 201

Nullpointer Exception on Server Response

I created an application that helps users login to an online server using APIs. I use retrofit to help me make network calls to the server. Strangely some devices like tablets and apps like blue stacks gets null pointer exception when the response from the server is null. Kindly help me fix the null pointer exception. NB: There are so many questions on Null pointer Exception but none is tailored to fit my question.

This is my codes below

public void loginUser(String userName, String userPassword, Boolean userRememberMe) {

    Retrofit retrofit = RetrofitClient.getClient(authUser.getToken());
    APIService mAPIService = retrofit.create(APIService.class);


    final ProgressDialog loading = ProgressDialog.show(this, "Please Wait", "...", false, false);
    loading.show();

    mAPIService.loginUser(userName, userPassword, userRememberMe).enqueue(new Callback<LendingResponse>() {
        @Override
        public void onResponse(Response<LendingResponse> response, Retrofit retrofit) {
            if(response.isSuccess()) {

                String userId = response.body().getData().getId();
                String userName = response.body().getData().getUsername();
                String name = response.body().getData().getName();
                String phoneNumber = response.body().getData().getPhoneNumber();
                String email = response.body().getData().getEmail();
                String token =response.body().getData().getToken();
                String gender = response.body().getData().getGender();


                loading.dismiss();
            }
        }

        @Override
        public void onFailure(Throwable throwable) {
            Log.e(TAG, throwable.getMessage());
            Toast.makeText(LoginActivity.this, "Unable to Login", Toast.LENGTH_SHORT).show();
            loading.dismiss();
        }
    });
}

This is my error logs from the play store below:

java.lang.NullPointerException: 

at com.jonathan.lendingsquare.auth.LoginActivity$3.onResponse (Unknown Source)

at retrofit.ExecutorCallAdapterFactory$ExecutorCallback$1.run (Unknown Source)

at android.os.Handler.handleCallback (Handler.java:733)

at android.os.Handler.dispatchMessage (Handler.java:95)

at android.os.Looper.loop (Looper.java:136)

at android.app.ActivityThread.main (ActivityThread.java:5001)

at java.lang.reflect.Method.invokeNative (Native Method)

at java.lang.reflect.Method.invoke (Method.java:515)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:793)

at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:609)

at dalvik.system.NativeStart.main (Native Method)

Upvotes: 0

Views: 1599

Answers (3)

Akhila
Akhila

Reputation: 3242

This worked for me

if (response.isSuccessful() && response.body() != null) {
       //Code here

}

Upvotes: 0

yash786
yash786

Reputation: 1151

Just check the value null or not:

if (!(signUp_jsonObject.isNull(response.body().getData().getId())))
{ 
    String userId = response.body().getData().getId();
}

Upvotes: 0

mehul chauhan
mehul chauhan

Reputation: 1802

Remove progress dialog than test it.

Other wise check following null or not

boolean mSuccess = false;

                if (response.isSuccessful())

                    if (response.body() != null)

                        if(response.body().getStatus().getSuccess().equalsIgnoreCase(Constants.getInstance().True))

                            mSuccess = true;

                if (mSuccess) {

                   //your code`enter code here`
                }

Upvotes: 3

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