Build: AI-221.5921.22.2211.8786657, 202206301309, 

AI-221.5921.22.2211.8786657, JRE 11.0.13+0-b1751.21-8125866x64 JetBrains s.r.o., OS Mac OS X(x86_64) v12.5, screens 3584.0x2240.0; Retina

AS: Electric Eel | 2022.1.1 Canary 8
Kotlin plugin: 221-1.7.0-release-for-android-studio-AS5591.52
Android Gradle Plugin: 7.4.0-alpha08
Gradle: 7.5
Gradle JDK: version 11.0.13
NDK: from local.properties: (not specified), latest from SDK: (not found)
CMake: from local.properties: (not specified), latest from SDK: (not found), from PATH: (not found)

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In some cases I'm getting this error when the compose preview is being generated:

_layoutlib_._internal_.kotlin.jvm.KotlinReflectionNotSupportedError: Kotlin reflection implementation is not found at runtime. Make sure you have kotlin-reflect.jar in the classpath
  at _layoutlib_._internal_.kotlin.jvm.internal.ClassReference.error(ClassReference.kt:88)   
  at _layoutlib_._internal_.kotlin.jvm.internal.ClassReference.getConstructors(ClassReference.kt:21)

In this case the next line in the stacktrace is our own code, basically custom dependency injection which is using reflection: val foo = kClass.constructors ...

Is there something the preview mechanism can do here so that part runs also? It's an other question if it makes sense to have runtime DI for previews. I'd like to mock out the dependencies, but there is a:

import androidx.lifecycle.viewmodel.compose.viewModel
val x = viewModel<Foo>()

in the composable function which is not clear yet to us how to exchange with a test object.

We're working on it (also any feedback is welcome), but maybe the above error can be also improved on the Compose Preview side.