Kotlin Reflection not working on binding projects

[rfsouto]

Android framework version

net8.0-android

Affected platform version

Jetbrains Rider 2024.3.5

Description

I have an aar native library that uses reflection to resolve json serialization (kotlinx-serialization-json-jvm-1.6.3.jar properly added too) in native the library works properly but when i put in my binding project and test it i receive this error:
Java.Lang.Error: Unresolved class: class java.lang.String (kind = null)

that becomes from the use of "Reflection.typeOf(String.class)" in the native library.

I tried to inject the class on the runtime but does not work, also i tried to get the class by name in my test project but this works correctly creating a Java.Lang.String class correctly:

Java.Lang.Class stringClass = Java.Lang.Class.ForName("java.lang.String");

Steps to Reproduce

1. When a native library tries do deserialize using reflection
2. Net Android Binding does not able to resolve the classes

Did you find any workaround?

No response

Relevant log output

Java.Lang.Error: Unresolved class: class java.lang.String (kind = null)
   at Java.Interop.JniEnvironment.InstanceMethods.CallVoidMethod(JniObjectReference instance, JniMethodInfo method, JniArgumentValue* args) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/obj/Release/net7.0/JniEnvironment.g.cs:line 20370
   at Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeVirtualVoidMethod(String encodedMember, IJavaPeerable self, JniArgumentValue* parameters) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:line 66
   at Com.Minsait.Veridas_android_sdk.VeridasHelper.StartDocumentCapture(IVeridasListener listener, Context applicationContext, IList`1 docs, IDictionary`2 configuration)
   at TestNet.MainActivity.<>c__DisplayClass8_0.<OnCreate>b__0(Object o, EventArgs e) in /Users/movilidad/Develop/Minsait/Librerias/XXXXXXiosxamarin/BindingXamarinAndroid/TestNet/MainActivity.cs:line 74
   at Android.Views.View.IOnClickListenerImplementor.OnClick(View v) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net8.0/android-34/mcw/Android.Views.View.cs:line 2410
   at Android.Views.View.IOnClickListenerInvoker.n_OnClick_Landroid_view_View_(IntPtr jnienv, IntPtr native__this, IntPtr native_v) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net8.0/android-34/mcw/Android.Views.View.cs:line 2374
   at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(_JniMarshal_PPL_V callback, IntPtr jnienv, IntPtr klazz, IntPtr p0) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 121
  --- End of managed Java.Lang.Error stack trace ---
kotlin.reflect.jvm.internal.KotlinReflectionInternalError: Unresolved class: class java.lang.String (kind = null)
	at kotlin.reflect.jvm.internal.KClassImpl.createSyntheticClassOrFail(KClassImpl.kt:340)
	at kotlin.reflect.jvm.internal.KClassImpl.access$createSyntheticClassOrFail(KClassImpl.kt:49)
	at kotlin.reflect.jvm.internal.KClassImpl$Data$descriptor$2.invoke(KClassImpl.kt:67)
	at kotlin.reflect.jvm.internal.KClassImpl$Data$descriptor$2.invoke(KClassImpl.kt:53)
	at kotlin.reflect.jvm.internal.ReflectProperties$LazySoftVal.invoke(ReflectProperties.java:70)
	at kotlin.reflect.jvm.internal.ReflectProperties$Val.getValue(ReflectProperties.java:32)
	at kotlin.reflect.jvm.internal.KClassImpl$Data.getDescriptor(KClassImpl.kt:53)
	at kotlin.reflect.jvm.internal.KClassImpl.getDescriptor(KClassImpl.kt:193)
	at kotlin.reflect.jvm.internal.KClassImpl.getDescriptor(KClassImpl.kt:49)
	at kotlin.reflect.full.KClassifiers.createType(KClassifiers.kt:47)
	at kotlin.reflect.jvm.internal.CachesKt$CACHE_FOR_BASE_CLASSIFIERS$1.invoke(caches.kt:37)
	at kotlin.reflect.jvm.internal.CachesKt$CACHE_FOR_BASE_CLASSIFIERS$1.invoke(caches.kt:36)
	at kotlin.reflect.jvm.internal.ConcurrentHashMapCache.get(CacheByClass.kt:92)
	at kotlin.reflect.jvm.internal.CachesKt.getOrCreateKType(caches.kt:55)
	at kotlin.reflect.jvm.internal.ReflectionFactoryImpl.typeOf(ReflectionFactoryImpl.java:123)
	at kotlin.jvm.internal.Reflection.typeOf(Reflection.java:128)
	at com.XXXXXX.resource.database.ResourcesDatabase$parseDocIdsByCountryMap$2.invokeSuspend(ResourcesDatabase.kt:232)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:111)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:99)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:585)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:802)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:706)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:693)

  --- End of managed Java.Lang.Error stack trace ---
kotlin.reflect.jvm.internal.KotlinReflectionInternalError: Unresolved class: class java.lang.String (kind = null)
	at kotlin.reflect.jvm.internal.KClassImpl.createSyntheticClassOrFail(KClassImpl.kt:340)
	at kotlin.reflect.jvm.internal.KClassImpl.access$createSyntheticClassOrFail(KClassImpl.kt:49)
	at kotlin.reflect.jvm.internal.KClassImpl$Data$descriptor$2.invoke(KClassImpl.kt:67)
	at kotlin.reflect.jvm.internal.KClassImpl$Data$descriptor$2.invoke(KClassImpl.kt:53)
	at kotlin.reflect.jvm.internal.ReflectProperties$LazySoftVal.invoke(ReflectProperties.java:70)
	at kotlin.reflect.jvm.internal.ReflectProperties$Val.getValue(ReflectProperties.java:32)
	at kotlin.reflect.jvm.internal.KClassImpl$Data.getDescriptor(KClassImpl.kt:53)
	at kotlin.reflect.jvm.internal.KClassImpl.getDescriptor(KClassImpl.kt:193)
	at kotlin.reflect.jvm.internal.KClassImpl.getDescriptor(KClassImpl.kt:49)
	at kotlin.reflect.full.KClassifiers.createType(KClassifiers.kt:47)
	at kotlin.reflect.jvm.internal.CachesKt$CACHE_FOR_BASE_CLASSIFIERS$1.invoke(caches.kt:37)
	at kotlin.reflect.jvm.internal.CachesKt$CACHE_FOR_BASE_CLASSIFIERS$1.invoke(caches.kt:36)
	at kotlin.reflect.jvm.internal.ConcurrentHashMapCache.get(CacheByClass.kt:92)
	at kotlin.reflect.jvm.internal.CachesKt.getOrCreateKType(caches.kt:55)
	at kotlin.reflect.jvm.internal.ReflectionFactoryImpl.typeOf(ReflectionFactoryImpl.java:123)
	at kotlin.jvm.internal.Reflection.typeOf(Reflection.java:128)
	at com.XXXXXX.resource.database.ResourcesDatabase$parseDocIdsByCountryMap$2.invokeSuspend(ResourcesDatabase.kt:232)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:111)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:99)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:585)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:802)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:706)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:693)

[jpobst]

It looks like you might need to also add the Kotlin Reflection package for it to work:
https://www.nuget.org/packages/Xamarin.Kotlin.Reflect

https://stackoverflow.com/a/34159517

[rfsouto]

Nope, i already had it added:

[jpobst]

These issues have a little more context around issues we have seen with Kotlin reflection in the past:

• Getting error using Kotlin Reflect KFunction #9626
• AndroidPackagingOptionsExclude cannot be modified #8456

Your error message is different, but it might have the same root cause.

Specifically, I would try the workaround here: #8456 (comment).