Application instance throws null pointer

Question

My application using Intent Service and Job Intent Service component according to the device supporting Android SDK. Inside my service component, I'm trying to access some of the public defined functions inside my application extended class. While trying to access this functions sometimes this throws NullPointer Exception.

MyApplication.class

public class MyApplication extends MultiDexApplication {

    private static final String TAG = MyApplication.class.getName();

    @Inject
    SharedPreferences mSharedPreferences;

    private BaseApplicationComponent applicationComponent;
    private static MyApplication mInstance;

    {
        mInstance = this;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        applicationComponent = DaggerBaseApplicationComponent.builder()
                .baseAndroidModule(new BaseAndroidModule(this))
                .remoteDataModule(new RemoteDataModule())
                .localDataModule(new LocalDataModule())
                .build();
        applicationComponent.inject(this);
    }

    public static synchronized MyApplication getInstance() {
        return mInstance;
    }

    public BaseApplicationComponent getComponent(){return 
       applicationComponent;
    }
}

Service Class OnCreate()

@Override
public void onCreate() {
    super.onCreate();
    MyApplication.getInstance().getComponent().plus(new NotificationServiceModule(this))
            .inject(this);
}

Crash Logs :

java.lang.RuntimeException: 
  at android.app.ActivityThread.handleCreateService 
        (ActivityThread.java:3554)
  at android.app.ActivityThread.-wrap4 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage 
      (ActivityThread.java:1786)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6942)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run 
     (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException: 
  at com.xyz.app.MyApplicarion.getComponent (MyApplication.java:93)
  at com.xyz.app.pushnotification.NotificationJobService.onCreate 
      (NotificationJobService.java:83)
  at android.app.ActivityThread.handleCreateService 
      (ActivityThread.java:3544)
  at android.app.ActivityThread.-wrap4 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage 
      (ActivityThread.java:1786)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6942)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run 
      (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

Is there any problem in my application or accessing code or give me any suggestions to solve this problem.

I think your `mInstance = this;` should come inside `onCreate()` method. — Surender Kumar, Feb 06 '19 at 06:56
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) — Henry, Feb 06 '19 at 06:57
I also tried to initialize instance inside create but the same issue faced. @SurenderKumar — baldraider, Feb 06 '19 at 06:59
@sasuke have you declared your Application class in Manifest? — Surender Kumar, Feb 06 '19 at 07:00
@SurenderKumar Yes I'm, as already mentioned in my question that application instance sometimes return null; — baldraider, Feb 06 '19 at 07:16
@AtifAbbAsi but you can't reference `this` with static field while deceleration, I think. — baldraider, Feb 06 '19 at 07:18
@sasuke I am very late, but it might be linked to app data restoration from the cloud : https://stackoverflow.com/a/60597718/1333448 — Yves Delerm, Mar 09 '20 at 09:48

Application instance throws null pointer

0 Answers0