I've got the following ViewModel: ```class Fundame...

# android

[Ken Maffei]

I've got the following ViewModel:

class FundamentalsViewModel: ViewModel() {

    var fundamentalsLiveData = MutableLiveData<WrappedResult<PriceDataResponse>>()
    private val repository = FundamentalsRespository()
    private var job: Job? = null

    fun getData(symbol: String) {
        if(job == null || job?.isActive == false) {
            fundamentalsLiveData.value = WrappedResult.Loading
            job = viewModelScope.launch(<http://Dispatchers.IO|Dispatchers.IO>) {
                try {
                    val response = repository.getData(symbol)
                    withContext(Dispatchers.Main) {
                        fundamentalsLiveData.value = WrappedResult.Success(response)
                    }
                } catch(e: Exception) {
                    withContext(Dispatchers.Main) {
  						fundamentalsLiveData.value = WrappedResult.Failure(e)
                    }
                }
            }
        }
    }
}

And out in the field I'm getting a crash that says this:

Fatal Exception: java.lang.NullPointerException
Parameter specified as non-null is null: method kotlin.j0.d.u.p, parameter symbol

On the line that is:

fundamentalsLiveData.value = WrappedResult.Loading

How is it possible that there is ANY NPE here? It makes no sense to me. The WrappedResult is a typical Kotlin sealed class that looks like this:

sealed class WrappedResult<out T> {
    data class Success<out T: Any>(val data:T) : WrappedResult<T>()
    data class Failure(val error: Throwable) : WrappedResult<Nothing>()
    data class CallFailure(val error: String) : WrappedResult<Nothing>()
    object Loading : WrappedResult<Nothing>()
}

Any ideas would be appreciated!

[rkeazor]

Response is probably null lol

[Ken Maffei]

The crash is happening on this line: fundamentalsLiveData.value = WrappedResult.Loading, not the line where I get the result.

[rkeazor]

Perhaps add breakpoints and step thru it,

[droid]

Is var fundamentalsLiveData = MutableLiveData<WrappedResult<PriceDataResponse>>() liveData being reset to null somewhere?