IllegalAccessError: Method is inaccessible to class

Question

I\'ve got very strange error, because it only happens after installing app from generated .apk. When I try to run the app through IDE, it works fine.

Answer 1

Make sure you've declared the method that is failing inside the same module as the calling code.

In my case I was experiencing following error:

java.lang.IllegalAccessError: Method 'boolean[] my.package.common.kotlin.AndroidExtensionsKt.$jacocoInit()' is inaccessible to class 'my.package.ui.first.FirstActivity$viewModel$2' (declaration of 'my.package.ui.first.FirstActivity$viewModel$2' appears in /data/app/my.package.dev-fdHNodmdXHv-b_heK4MXeA==/base.apk!classes8.dex)
    at my.package.ui.first.FirstActivity$viewModel$2.invoke(FirstActivity.kt:18)
    at my.package.ui.first.FirstActivity$viewModel$2.invoke(FirstActivity.kt:14)
    at kotlin.UnsafeLazyImpl.getValue(Lazy.kt:81)
    at my.package.ui.first.FirstActivity.getViewModel(Unknown Source:11)
    at my.package.ui.first.FirstActivity.onCreate(FirstActivity.kt:23)

Where getViewModel() was declared in common module and FirstActivity was declared in app module:

inline fun  FragmentActivity.getViewModel(
    factory: ViewModelProvider.Factory = ViewModelProvider.NewInstanceFactory()
) = ViewModelProviders.of(this, factory).get(T::class.java)

After moving getViewModel() from common module to app module no issues were seen.