ARCore 1.4.0 critical issue on sync / compilation

[OlegNovosad]

Stackoverflow thread is here

Basically this occurred when I updated my project ARCore and Sceneform to 1.4.0 version. During build I received next issue:

Class content provided for type descriptor com.google.ar.core.h actually defines class com.google.ar.core.H Message{kind=ERROR, text=Class content provided for type descriptor com.google.ar.core.h actually defines class com.google.ar.core.H, sources=[Unknown source file], tool name=Optional.of(D8)}

Was not able to Google it so the only thing I tried after all recommendations on similar issues - downgrade version and it started to work.

[inio]

That's pretty odd. We'll look into it.

From the SO post: you got this error when building for the x86 emulator, right? I don't think architecture would affect clearly Java-related build-time issues, but just in case it matters I want to document that.

[inio]

On the upside, congrats on being the first person to ever ask about this diagnostic message!

[OlegNovosad]

I built for Pixel 2, x86 arch. Also I did built for Samsung Galaxy S8.

[OlegNovosad]

More updates to the issue. Still might be strange but worth to try. I had my AR running if ArCore apk was already installed. After I uninstall it, and added this code in my onCreateView() method in Fragment:

private void verifyArSupported() {
        ArCoreApk.Availability availability = ArCoreApk.getInstance().checkAvailability(App.getContext());
        if (availability.isTransient()) {
            new Handler().postDelayed(() -> verifyArSupported(), 200);
        }

        if (availability.isSupported()) {
            btnAR.setVisibility(View.VISIBLE);
            btnAR.setEnabled(true);
        } else {
            btnAR.setVisibility(View.GONE);
            btnAR.setEnabled(false);
        }
    }

I started receiving next error:

Process: com.severenity, PID: 5548
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/ar/core/a;
        at com.google.ar.core.ArCoreApk$Availability.<clinit>(Unknown Source)
        at com.google.ar.core.h.checkAvailability(Unknown Source)
        at com.severenity.view.quests.QuestPartFragment.verifyArSupported(QuestPartFragment.java:247)
        at com.severenity.view.quests.QuestPartFragment.onCreateView(QuestPartFragment.java:206)
        at android.support.v4.app.Fragment.performCreateView(Fragment.java:2346)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1428)
        at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1759)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1827)
        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2596)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2383)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2338)
        at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2215)
        at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:649)
        at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:167)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:1238)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:1086)
        at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1616)
        at android.view.View.measure(View.java:21121)
        at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
        at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6462)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.view.View.measure(View.java:21121)
        at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
        at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6462)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:141)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6462)
        at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:400)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6462)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6462)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6462)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:897)
        at android.view.View.measure(View.java:21121)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2625)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1677)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1928)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1550)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7189)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:959)
        at android.view.Choreographer.doCallbacks(Choreographer.java:734)
        at android.view.Choreographer.doFrame(Choreographer.java:670)
08-17 15:21:10.399 5548-5548/com.severenity E/AndroidRuntime:     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:945)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6776)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.ar.core.a" on path: DexPathList[[zip file "/data/app/com.severenity-1/base.apk"],nativeLibraryDirectories=[/data/app/com.severenity-1/lib/arm64, /data/app/com.severenity-1/base.apk!/lib/arm64-v8a, /system/lib64, /vendor/lib64]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)

I also tried other methods (onActivityCreated(), onResume()) in fragment, but they did not work. Hope this helps somehow.

[inio]

This is starting to sound like your build system might be part of the problem. Try turning off proguard and any other postprocessing and see if that changes anything.

[OlegNovosad]

Funny thing. I tried to disable proguard and it did not help. The thing helped is answered at StackOverflow here

Firebase Performance Plugin was causing a lot of troubles and after adding to app gradle file this:

if (!project.gradle.startParameter.taskNames.any { taskName ->
    taskName.toLowerCase().contains('assemble') && taskName.toLowerCase().contains('debug') }) {
    apply plugin: 'com.google.firebase.firebase-perf'
}

and to main gradle file this:

if (!project.gradle.startParameter.taskNames.any { taskName ->
    taskName.toLowerCase().contains('assemble') && taskName.toLowerCase().contains('debug') }) {
    classpath("com.google.firebase:firebase-plugins:1.1.5") {
        exclude group: 'com.google.guava', module: 'guava-jdk5'
    }
}

Issue disappeared. But still it would be great to have more descriptive error messages in such cases.

Update: looks like Firebase Performance Plugin was causing the issue. It still failed for release build type, so after complete removal - things did work.

[efthymios1991]

@OlegNovosad Did you manage to solve this one? I am getting a similar error caused by the firebase-performance as well

[inio]

This is likely to to collisions between proguarded class names. Per #566 we've tweaked our SDK proguard config to keep all package names so hopefully this will be less of an issue starting with the 1.6 SDK.