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The Firebase implementation within an AAR I'm using causes my App to crash

I had been contacted to put a new library in the form of an AAR into my application. It worked fine before adding this AAR, but after that, every time I start it up, it crashes with the following stacktrace:
09-10 21:10:55.272 10354-10354/? W/System.err: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/tasks/TaskCompletionSource;
at com.google.firebase.remoteconfig.FirebaseRemoteConfig.zza(Unknown Source)
at com.google.firebase.remoteconfig.FirebaseRemoteConfig.fetch(Unknown Source)
at com.picmix.mobile.activity.SplashActivity.onCreate(SplashActivity.java:89)
at android.app.Activity.performCreate(Activity.java:6093)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2458)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2577)
at android.app.ActivityThread.access$1000(ActivityThread.java:164)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1462)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:160)
at android.app.ActivityThread.main(ActivityThread.java:5541)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:964)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.tasks.TaskCompletionSource" on path: DexPathList[[zip file "/data/app/com.picmix.mobile-2/base.apk"],nativeLibraryDirectories=[/data/app/com.picmix.mobile-2/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
... 16 more
Suppressed: java.lang.ClassNotFoundException: com.google.android.gms.tasks.TaskCompletionSource
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 17 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
From my experience, this kind of error is because I hadn't enabled MultiDex support. The strange thing is that I have it enabled, my gradle file contains the following line:
compile 'com.android.support:multidex:1.0.3'
The application I use in the manifest extends MultiDexApplication instead of just Application.
So is it something with that AAR?

MultiDex issue: java.lang.ClassNotFoundException: Didn't find class on path: DexPathList

I am facing an issue with my app:
If I deactivate within Android Studio Instant Run, my app crashes upon startup with the stacktrace:
12-29 13:36:37.876 4549-4549/com.mycoolapp.debug E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mycoolapp.debug, PID: 4549
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mycoolapp.debug/com.myapp.SplashScreenActivity}: java.lang.ClassNotFoundException: Didn't find class "com.myapp.SplashScreenActivity" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/com.mycoolapp.debug-2/base.apk"],nativeLibraryDirectories=[/data/app/com.mycoolapp.debug-2/lib/arm, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2216)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$800(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5272)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.myapp.SplashScreenActivity" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/com.mycoolapp.debug-2/base.apk"],nativeLibraryDirectories=[/data/app/com.mycoolapp.debug-2/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365) 
at android.app.ActivityThread.access$800(ActivityThread.java:148) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5272) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704) 
Suppressed: java.lang.NoClassDefFoundError: com.myapp.SplashScreenActivity
at dalvik.system.DexFile.defineClassNative(Native Method)
at dalvik.system.DexFile.defineClass(DexFile.java:226)
at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
at dalvik.system.DexPathList.findClass(DexPathList.java:321)
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
... 14 more
Suppressed: java.lang.ClassNotFoundException: com.myapp.SplashScreenActivity
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
As far as I have researched this belongs to multidex:
https://developer.android.com/studio/build/multidex.html
Even if I add the multiDexEnabled property to my gradle config the app crashes. Only if I enable InstantRun (which enables multidex in background), the app runs...
If I create an apk the installation works, but the app crashes on startup with the same error.
Since I have as minSDK API Level 21, there should be no other change except of the multiDexEnabled property necessary, right?

So last but not least my answer:
All my configuration for multidex was correct... I don't know why, but after a complete OS restart everything works fine now... :)

Just create new phone on AVD and try to install app on that phone. Hope it will work.

The accepted answer was only a temporary fix for me, after altering code and a few builds the error came back.
After alot of trial and error the real problem was the jdk location my project was using, instead of using the embedded jdk in android studio i was using an installed version from oracle. After going to File > Project Structure > SDK Location and checking Use embedded JDK the problem was fixed for good.

Check if your classpath
'com.android.tools.build:gradle:3.1.0-alpha05'
is up-to-date, had same problem and solved it with a full update.

Android/Scala project in IntelliJ 14 compiles, but crashes when launched not finding Scala class

I created a new Android project in Intellij 14, then added Scala SDK 2.11.6 to it (scope provided was the only option that worked for me). The project runs fine if I don't use any Scala class. But once I use, say, string interpolation, as soon as the code is run, the app crashes with this error:
06-20 18:36:27.277 1995-1995/com.pcn.android.games.jacks D/AndroidRuntime﹕ Shutting down VM
06-20 18:36:27.289 1995-1995/com.pcn.android.games.jacks E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.pcn.android.games.jacks, PID: 1995
java.lang.NoClassDefFoundError: Failed resolution of: Lscala/StringContext;
at com.pcn.android.games.jacks.MyActivity.onCreate(MyActivity.scala:16)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassNotFoundException: Didn't find class "scala.StringContext" on path: DexPathList[[zip file "/data/app/com.pcn.android.games.jacks-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
            at com.pcn.android.games.jacks.MyActivity.onCreate(MyActivity.scala:16)
            at android.app.Activity.performCreate(Activity.java:5990)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
            at android.app.ActivityThread.access$800(ActivityThread.java:151)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5257)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Suppressed: java.lang.ClassNotFoundException: scala.StringContext
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 15 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
I use IntelliJ 14.1.3, Java 1.7.0_80. My proguard-project.txt file is empty, but this persists whether I turn on Proguard or not.
What have I done wrong that prevents Scala classes from being seen at runtime?

What have I done wrong that prevents Scala classes from being seen at runtime?
Hard to tell without looking into your build files and the way your app is building. I suggest you move to the Gradle build system and use one of the android-scala plugins, such as this one. I used it about 3-4 months ago in one of my apps and it worked as a charm.
Gradle-based builds will save you a lot of the time, because it's officially supported by Google and it's used by many people (thus you'll be more likely to get the help from community). It also supports some features not supported by Intellij-based build system, such as build flavors/splits and is constantly optimized by Google engineers to get the fastest build times possible.

java.lang.NoClassDefFoundError: roboguice.activity.SherlockAccountAuthenticatorActivity with ActiveAndroid in android 5.0

I am getting this error -
java.lang.NoClassDefFoundError: roboguice.activity.SherlockAccountAuthenticatorActivity
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:308)
at com.activeandroid.ModelInfo.scanForModelClasses(ModelInfo.java:187)
at com.activeandroid.ModelInfo.scanForModel(ModelInfo.java:152)
at com.activeandroid.ModelInfo.<init>(ModelInfo.java:63)
at com.activeandroid.Cache.initialize(Cache.java:66)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:44)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:34)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:30)
at com.activeandroid.app.Application.onCreate(Application.java:25)
at com.dvor.androidapp.Application.TabletApplication.onCreate(TabletApplication.java:22)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1011)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4518)
at android.app.ActivityThread.access$1500(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
In Android version 5.0, I am using RoboGuice and ActiveAndroid and the application class is extending com.activeandroid.app.Application, is there any other way how to fix this issue except extending the normal Application class and adding the model classes manually(this way it each model class needs to be added), as explained(https://github.com/pardom/ActiveAndroid/issues/291) :
Configuration.Builder configurationBuilder = new Configuration.Builder(this);
configurationBuilder.addModelClass(Test.class);
configurationBuilder.addModelClass(Test2.class);
ActiveAndroid.initialize(configurationBuilder.create());

The workaround for this problem, was adding the Roboguice jar files, and ActiveAndroid jar files to lib folder, and replacing Gradle "compile" command with -
compile files('libs/ActiveAndroid.jar')
compile files('libs/simple.facebook-2.2.jar')
compile files('libs/guice-3.0-no_aop.jar')
compile files('libs/javax.inject-1.jar')
compile files('libs/roboguice-3.0b-experimental.jar')

Dagger code giving NoClassDefFoundError in Android instrumentation tests, but works in the normal application

I am using Dagger in an Android application.
It is working in the Application but when I run the instrumentation tests, I am getting a NoClassDefFoundError.
I am using Gradle and Espresso. This is happening WITHOUT progaurd.
This is strange since the "Module$$ModuleAdapter" getting loaded , but "Module$$ModuleAdapter$EndpointProvidesAdapter" is not.
I pulled the APK back off the device and used dexdump to verify that the class is indeed in the APK, "Module$$ModuleAdapter$EndpointProvidesAdapter".
Any ideas on what might be causing this?
java.lang.NoClassDefFoundError: Module$$ModuleAdapter$EndpointProvidesAdapter
at ...Module$$ModuleAdapter.getBindings(MslModule$$ModuleAdapter.java:33)
at ...Module$$ModuleAdapter.getBindings(MslModule$$ModuleAdapter.java:13)
at dagger.ObjectGraph$DaggerObjectGraph.makeGraph(ObjectGraph.java:185)
at dagger.ObjectGraph$DaggerObjectGraph.access$000(ObjectGraph.java:138)
at dagger.ObjectGraph.create(ObjectGraph.java:129)
at ...Application.onCreate(...Application.java:21)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4344)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class ...Module$$ModuleAdapter$MslEndpointProvidesAdapter" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/....test-1.apk", zip file "/data/app/...-2.apk"],nativeLibraryDirectories=[/data/app-lib/....test-1, /data/app-lib/...-2, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
            at ...Module$$ModuleAdapter.getBindings(MslModule$$ModuleAdapter.java:33)
            at ...Module$$ModuleAdapter.getBindings(MslModule$$ModuleAdapter.java:13)
            at dagger.ObjectGraph$DaggerObjectGraph.makeGraph(ObjectGraph.java:185)
            at dagger.ObjectGraph$DaggerObjectGraph.access$000(ObjectGraph.java:138)
            at dagger.ObjectGraph.create(ObjectGraph.java:129)
            at ...eApplication.onCreate(...Application.java:21)
            at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
            at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4344)
            at android.app.ActivityThread.access$1500(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)

Double Espresso is now deprecated in favor of Espresso 2.0. It's possible that it worked for you because Jake's done a good job of enumerating transitive dependencies that you may need to exclude in order to get things working.
In my experience, using Espresso 2.0 with Dagger may require you to exclude javax.inject from your espresso dependencies:
androidTestCompile ('com.android.support.test.espresso:espresso-core:2.0') {
exclude group: 'javax.inject'
}
You may need to do this for all of the espresso dependencies that your project includes.

This seems to be more related to the way I was including Espresso than it is a Dagger issue...
androidTestCompile ('com.google.android.apps.common.testing:espresso:1.1' ){
exclude group: 'com.squareup.dagger'
}
Switching to Jake Wharton's "double-espresso" made the problem go away.
https://github.com/JakeWharton/double-espresso
I am still not sure why that would cause a NoClassDefFoundError on that Dagger generated class.