AWS AppSync Error - AWSMobileClientStore.get(String) on null object reference

Question

APPSYNC_ERROR: Attempt to invoke virtual method

java.util.Map com.amazonaws.mobile.client.AWSMobileClientStore.get(java.lang.String[]) on a null object reference

I am trying to inserting data in AWS table, But i got this error. Can you help me to resolve this issue?

AWSAppSyncClient client = AWSAppSyncClient.builder()
                .context(context)
                .region(AppHelper.cognitoRegion)
                .serverUrl(AppHelper.SERVER_URL)
                .cognitoUserPoolsAuthProvider(new CognitoUserPoolsAuthProvider() {
                    @Override
                    public String getLatestAuthToken() {
                        try {
                            return AWSMobileClient.getInstance().getTokens().getIdToken().getTokenString();
                        } catch (Exception e){
                            Log.e("APPSYNC_ERROR", e.getLocalizedMessage());
                            return e.getLocalizedMessage();
                        }
                    }
                }).persistentMutationsCallback(new PersistentMutationsCallback() {
                @Override
                public void onResponse(PersistentMutationsResponse response) {
                    Log.d("NOTERROR", response.getMutationClassName());
                }

                @Override
                public void onFailure(PersistentMutationsError error) {
                    Log.e("TAG", error.getMutationClassName());
                    Log.e("TAG", "Error", error.getException());
                }
                }).build();

I have follow this tutorial... https://aws.amazon.com/pt/blogs/mobile/building-an-android-app-with-aws-amplify-part-1/ https://aws.amazon.com/blogs/mobile/building-an-android-app-with-aws-amplify-part-2/ — viral 9966, May 13 '19 at 09:23
GraphQLCall.Callback mutateCallback onFailure. com.apollographql.apollo.exception.ApolloHttpException: HTTP 401 — viral 9966, May 13 '19 at 09:50

score 5 · Answer 1 · answered May 22 '19 at 15:57

You need to initialize AWSMobileClient successfully before its usage.

AWSMobileClient.getInstance().initialize(getApplicationContext(), new Callback<UserStateDetails>() {
     @Override
    public void onResult(UserStateDetails userStateDetails) {
        switch (userStateDetails.getUserState()){
            case SIGNED_IN:
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        TextView textView = (TextView) findViewById(R.id.text);
                        textView.setText("Logged IN");
                    }
                });
                break;
            case SIGNED_OUT:
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        TextView textView = (TextView) findViewById(R.id.text);
                        textView.setText("Logged OUT");
                    }
                });
                break;
            default:
                AWSMobileClient.getInstance().signOut();
                break;
        }
    }

    @Override
    public void onError(Exception e) {
        Log.e("INIT", e.toString());
    }
});

If initialize is successful, you will be able to retrieve the tokens through the getTokens() method.

Source: https://aws-amplify.github.io/docs/android/authentication

AWS AppSync Error - AWSMobileClientStore.get(String) on null object reference

1 Answers1