NoClassDefFoundError below SDK 21

Question

I just experienced an awkward bug in my App.

On my Nexus 5/7, running android 5.0.1/5.0.2, everything works just fine. However if i try running the exact same code on a device with an earlier version (tested 4.4.4 and 4.3) I get the following error:

03-13 13:49:41.140  21714-21714/? E/dalvikvm﹕ Could not find class 'com.default.package.application.model.Appcomponent', referenced from method com.default.package.application.controller.DatabaseHandler.getScreenComponents 03-13 13:49:41.140  21714-21714/? E/dalvikvm﹕ Could not find class 'android.support.v7.app.ActionBarActivityDelegate$1', referenced from method android.support.v7.app.ActionBarActivityDelegate.<init> 03-13 13:49:41.140  21714-21714/? E/dalvikvm﹕ Could not find class 'android.support.v7.app.ActionBarActivityDelegateHC', referenced from method android.support.v7.app.ActionBarActivityDelegate.createDelegate 03-13 13:49:41.140  21714-21714/? E/dalvikvm﹕ Could not find class 'android.support.v7.app.ActionBarActivityDelegateBase', referenced from method android.support.v7.app.ActionBarActivityDelegate.createDelegate 03-13 13:49:41.150  21714-21714/? E/dalvikvm﹕ Could not find class 'android.support.v7.app.ActionBarActivityDelegate$ActionBarDrawableToggleImpl', referenced from method android.support.v7.app.ActionBarActivityDelegate.getDrawerToggleDelegate 03-13 13:49:41.150  21714-21714/? E/dalvikvm﹕ Could not find class 'android.support.v7.internal.view.SupportMenuInflater', referenced from method android.support.v7.app.ActionBarActivityDelegate.getMenuInflater 03-13 13:49:41.150  21714-21714/? E/dalvikvm﹕ Could not find class 'android.support.v7.app.ActionBarActivityDelegate$ActionBarDrawableToggleImpl', referenced from method android.support.v7.app.ActionBarActivityDelegate.getV7DrawerToggleDelegate 03-13 13:49:41.150  21714-21714/? E/AndroidRuntime﹕ FATAL EXCEPTION: main     Process: com.default.package, PID: 21714     java.lang.NoClassDefFoundError: android.support.v7.app.ActionBarActivityDelegateHC 

I've already tried adding the support.v7 library as jar, but makes no difference. But since it works on Lollipop devices this wouldn't make sense anyway.

Could it be that there's some issue concerning the Dalvik/Art change? Or maybe the fact that I had to use com.android.support:multidex:1.0.0 since it's a rather large app.

Update: I tried removing some dependencies to get under the 65k method limit. After that the app ran on 4.4.4 and 4.3 devices. All I did for enabling multidex support was setting

multiDexEnabled true 

in the defaultConfig section and adding

compile 'com.android.support:multidex:1.0.0' 

below in the dependencies section of my build.gradle.

Any idea why this causes these issues on the older android versions?

Answer 1

I resolved the issue by adding this to my Application Class.

@Override protected void attachBaseContext(Context base) {     super.attachBaseContext(base);     MultiDex.install(this); } 

Seems to be neccessary for android versions prior 5.

Answer 2

There are three ways how this is going to work.

1. As @FireZenk noted you can declare this class as the application in your AndroidManifest.xml.

<application android:name="android.support.multidex.MultiDexApplication"> 

And actually with the android grade plugin version 0.14.0 and build tools version 21.1.0 when you specify the multiDexEnabled true in the defaultConfig, ProductFlavor, or BuildTypethen it automatically includes dependence to the com.android.support:multidex:1.0.0. You can check that with the androidDependencie task or you run ./gradlew -q android:dependencies command (android: is my android module). So there is no need to explicitly add the

compile 'com.android.support:multidex:1.0.0' 

If you have extended Application class in your app:

2. Define that your Application extends MultiDexApplication class, like:

public class MyApplication extends MultiDexApplication {     ... } 

or like @user2700475 posted

3. Have your Application override attachBaseContext:

public class MyApplication extends Application {     @Override     protected void attachBaseContext(Context base) {     super.attachBaseContext(base);     MultiDex.install(this);} } 

With the help of previous answers I manage to find the solution to this problem. I just want to put all this together.