I'm using Android Studio 2.3.3, with Android Plugin for Gradle 2.3.3.
Please see my sample project, https://github.com/Uni-/AndroidModuleTest. In this project, there are two sample modules (as Android Studio names), app and library.
library has com.example.test.myapplication.MainActivity class, and it's referenced in AndroidManifest.xml of app. The application is compiled well, but it crashes on startup:
10-31 22:20:55.031 30084-30084/? I/zygote64: Late-enabling -Xcheck:jni
10-31 22:20:55.312 30084-30084/? I/InstantRun: starting instant run server: is main process
10-31 22:20:55.325 30084-30084/? D/AndroidRuntime: Shutting down VM
10-31 22:20:55.327 30084-30084/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.test.myapplication, PID: 30084
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.test.myapplication/com.example.test.myapplication.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.test.myapplication.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/base.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/lib/arm64, /system/lib64, /vendor/lib64]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2718)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.test.myapplication.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/base.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.example.test.myapplication-dsBQ8b1LFh9WtKzvdfrLYg==/lib/arm64, /system/lib64, /vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
10-31 22:20:55.328 30084-30084/? E/AndroidRuntime: at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.Instrumentation.newActivity(Instrumentation.java:1173)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2708)
... 9 more
10-31 22:21:00.439 30084-30093/com.example.test.myapplication I/zygote64: Waiting for a blocking GC ObjectsAllocated
10-31 22:21:00.537 30084-30093/com.example.test.myapplication I/zygote64: WaitForGcToComplete blocked for 97.913ms for cause ObjectsAllocated
The MainActivity class seems not existing in the application artifact, according to the log.
In fact, build.gradle of app contains these lines:
debugCompile project(path: ':library', configuration: 'debugCompile')
releaseCompile project(path: ':library', configuration: 'releaseCompile')
When I replace these lines by a line below, the error goes fixed:
compile project(':library')
However, this is not what I want. I have various product flavors and custom build types in my real project, so just a compile, or even implementation in 3.0, can't be a solution.
What did I wrong in my sample project?
I fixed this by myself.
The key point is setting publishNonDefault true in build.gradle of library.
Also, the contextual dependencies should be declared as:
debugCompile project(path: ':library', configuration: 'debug')
releaseCompile project(path: ':library', configuration: 'release')
Fixed in 151f6e4. Thanks.