Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

CorourtineScope returns null

See original GitHub issue

When using coroutines for making network calls, I encountered that

private var viewModelJob = Job()
private val coroutineScope: CoroutineScope = CoroutineScope(viewModelJob + Dispatchers.Main)

private fun getMarsRealEstateProperties() {
    if (coroutineScope == null) {
        Log.d("TAG_TAG", "NULL")
    }
}

At first when using coroutineScope.launch {…}, it throws

java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter receiver$0

Is this a bug or some problem on my side?

Issue Analytics

State:
Created 4 years ago
Comments:6

Top GitHub Comments

9reactions

casablancapluspluscommented, Jan 12, 2020

you must create your job and coroutineScope before the init block.

0reactions

shubamuzumakicommented, Jul 6, 2020

you must create your job and coroutineScope before the init block.

It solved my problem, but can u explain what was the problem

Top Results From Across the Web

Kotlin coroutine list returning null value - Stack Overflow

I would suggest using LivaData to observe data: class MyViewModel : ViewModel() { val listado: LiveData<String> = MutableLiveData<String>() ...

CoroutineScope - Kotlin

Defines a scope for new coroutines. Every coroutine builder (like launch, async, etc.) is an extension on CoroutineScope and inherits its coroutineContext ...

Return value from coroutines - CommonsWare

For a method that has coroutine scope that does work in the back ground, ... searchTeamEvents(“TeamName”) it still returns the empty string.

Android Coroutine Recipes. Table of Contents - ProAndroidDev

Background job is executed via withContext function with the IO dispatcher. val uiScope = CoroutineScope(Dispatchers.Main)fun loadData() = uiScope.launch { view ...

Kotlin Coroutine Job Lifecycle - Marco Cattaneo

Coroutine Scope : what's its lifecycle and the behavior of jobs. ... Parent Job: the parent Job of children jobs, by default is...