i have initialized but still got Null Pointer Exception

Question

i got this error message

java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.example.asus.cataloguemovieuiux.model.MovieResponse.getResults()' on a null object reference at com.example.asus.cataloguemovieuiux.fragment.PlayingFragment$1.onResponse(PlayingFragment.java:83) at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5290) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706)

i have checked to Movie class and there's no something wrong, and also checked on MovieResponse class. i'm so confused. why it's return to NullPointerException? here's the code of method that got error :(

progressDialog = ProgressDialog.show(getActivity(), null, getResources().getString(R.string.loading_dialog), true, false);
    movieResponse = client.getInterface().getNowPlaying(BuildConfig.API_KEY);
    movieResponse.enqueue(new Callback<MovieResponse>() {
        @Override
        public void onResponse(Call<MovieResponse> call, Response<MovieResponse> response) {
            List<Movie> movies = response.body().getResults();
            mRecyclerView.setAdapter(new MoviesAdapter(getContext(), movies));
        }

        @Override
        public void onFailure(Call<MovieResponse> call, Throwable t) {

        }
    });

on line

List movies = response.body().getResults();

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — leonardkraemer, Sep 25 '18 at 15:30
yeah, check if the request was successful (response.isSuccessful()), nullity checks etc. Probably the API path is wrong, or the API key invalid. — Regulus, Sep 25 '18 at 15:31
You might be getting null `response`, you can debug by putting breakpoint on that line and check if `response` is null. — Kinjal Rathod, Sep 25 '18 at 15:33
Probably your MovieResponse class does not map correctly the server's response. You can use this tool, for example: http://www.jsonschema2pojo.org/ to generate the class automatically. — Regulus, Sep 25 '18 at 15:58

score 0 · Answer 1 · answered Sep 25 '18 at 15:32

0

You can see that your error is caused when you're trying to change your List 'movies'. Check to see if response.body().getResults() is null.

answered Sep 25 '18 at 15:32

Joshua Best

246
1
14

why it's turn to null? i have initialize List on MovieResponse – Mavisa9 Sep 25 '18 at 15:40
Your response body may be null. – Joshua Best Sep 25 '18 at 15:41

score 0 · Answer 2 · answered Sep 25 '18 at 17:33

0

Try checking for null by wrapping your code with if statement as below;

if (response.body() != null){
    List<Movies> movies = response.body().getResults();
}

answered Sep 25 '18 at 17:33

Show Young Soyinka

544
3
14

i have initialized but still got Null Pointer Exception

2 Answers2