Unexpected NullPointerException When Accessing ViewModel in Fragment on Android 14
I'm getting frustrated with I'm optimizing some code but I'm writing unit tests and I'm encountering a `NullPointerException` when trying to access my `ViewModel` from a Fragment... The error message I'm receiving is: ``` java.lang.NullPointerException: Attempt to invoke virtual method 'androidx.lifecycle.ViewModelProvider androidx.fragment.app.Fragment.getViewModelStore()' on a null object reference ``` I am using Android 14 along with ViewModel and LiveData to manage UI-related data in a lifecycle-conscious way. My Fragment is supposed to observe LiveData from the ViewModel, but it seems that the Fragment isn't properly initialized when I try to access the ViewModel. Here's a snippet of how I'm currently implementing it: ```kotlin class MyFragment : Fragment() { private lateinit var myViewModel: MyViewModel override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { return inflater.inflate(R.layout.fragment_my, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) myViewModel = ViewModelProvider(this).get(MyViewModel::class.java) myViewModel.myLiveData.observe(viewLifecycleOwner, Observer { data -> // Update UI }) } } ``` I've ensured that the Fragment is attached to the Activity and the ViewModel is set up correctly, but I'm still getting the crash when the Fragment is recreated after a configuration change. Additionally, I'm using the `viewLifecycleOwner` to observe LiveData, which I thought would prevent memory leaks. I've tried moving the ViewModel initialization to `onCreate()` instead of `onViewCreated()`, but that led to the same exception. Does anyone have insights into why this may be happening or how I can handle this situation better? What am I doing wrong? This is for a desktop app running on Linux. What am I doing wrong?