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Android 7 is API level 24 and java.lang.reflect.Executable is introduced in API level 26: https://developer.android.com/reference/java/lang/reflect/Executable

Guys, hello! Sample to reproduce in attachments)

Sorry I was not clear before. The API java.lang.reflect.Executable does not exist on Android 7 (API 24) so it is expected for a program trying to use it to fail with this error. Is there a specific reason you expect the program to behave differently? Is the call to the unavailable API guarded by an SDK version check?

The application does not use java.lang.reflect.Executable, such code generates R8 itself. It replaces java.lang.reflect.Constructor with java.lang.reflect.Executable during the minification process but it shouldn't do that.

Please, try to run Sample Project and compare result with and without minification enabled.

Thank for the added info! That is indeed an error and looks like a case where the compilers API modeling is missing something.

Retraced stacktrace:

07-04 03:32:26.888  1766  1792 E ActivityControllerCore: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/lang/reflect/Executable;
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at com.squareup.moshi.ClassFactory.get(ClassFactory.java)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at com.squareup.moshi.AccessObject.toString(AccessObject.java)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at com.example.myapplication.MainActivity.onCreate(MainActivity.java:12)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.Activity.performCreate(Activity.java:6664)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.ActivityThread.-wrap12(ActivityThread.java)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.os.Handler.dispatchMessage(Handler.java:102)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.os.Looper.loop(Looper.java:154)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at android.app.ActivityThread.main(ActivityThread.java:6077)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at java.lang.reflect.Method.invoke(Native Method)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: Caused by: java.lang.ClassNotFoundException: Didn't find class "java.lang.reflect.Executable" on path: DexPathList[[zip file "/data/app/com.example.myapplication-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.myapplication-1/lib/x86, /system/lib, /vendor/lib]]
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
07-04 03:32:26.888  1766  1792 E ActivityControllerCore: 	at java.lang.ClassLoader.loadClass(ClassLoader.java:312

Hi, guys. Do you have any news?

I have a CL up that fixes this but I am holding it back until other fixes has landed. This issue will be updated when the fix lands.

I just verified that running with version 8.0.57 in the reproduction solves the issue. I cannot speak to when this will be merged into AGP/Studio, but for anyone else seeing this problem, you can define the dependency by modifying build.gradle :

buildscript {
    dependencies {
        classpath 'com.android.tools:r8:8.0.57'  // Must be before the Gradle Plugin for Android.
    }
}

and settings.gradle:

pluginManagement {
    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
        maven {
            url 'https://storage.googleapis.com/r8-releases/raw'
        }
    }
}
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven {
            url 'https://storage.googleapis.com/r8-releases/raw'
        }
    }
}

This fix did not make any releases of AGP 8.0 or for the release of AGP 8.1.0. If you are using either of those you will need to manually link to a fixed R8 version as detailed in comment #18.

This fix is included in AGP 8.1.1 (which shipped with R8 version 8.1.65) and onward.