Android Kotlin : java.lang.NoClassDefFoundError: Failed resolution of: <KotlinObject>

Question

Every second run of our android app, we get a crash that says

java.lang.NoClassDefFoundError: Failed resolution of: Lin/blahapp/xxx/BlahUtil

BlahUtil is a kotlin object with @JvmStatic annotations in it. I call these static methods from the rest of the android app(All in java) .

We use multidex 1.0.1.

I am on android studio 2.1.2, using JDK 7.

Relevant gradle configs:

compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
        minSdkVersion 16
        targetSdkVersion 23
}
dexOptions {
        incremental true
        dexInProcess true
        javaMaxHeapSize "10g"
        preDexLibraries true
}
buildscript {
    ext.kotlin_version = '1.0.3'

    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
apply plugin: 'kotlin-android'
dependencies {
  compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
  compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
}

Trace:

at in.blahapp.xxx.OurActivity 
at android.app.Activity.performCreate(Activity.java:6251)
at ndroid.app.Instrumentation.callActivityOnCreate
at android.app.ActivityThread.performLaunchActivity
at android.app.ActivityThread.handleLaunchActivity
at android.app.ActivityThread.-wrap11
at android.app.ActivityThread$H.handleMessage
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Caused by: java.lang.ClassNotFoundException: Didn't find class "in.blahapp.xxx.BlahUtil" on path: DexPathList[[dex file ....

logcat output

Answer 1

You should turn off 'Instant Run'. Android Studio -> Preferences -> Build, Execution, Deployment -> Instant Run. Turn off everything.