How to solve ConcurrentModificationException

Question

After updating the App I get errors from Firebase almost in all activities.

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.project.app/com.project.app.MainActivity}: java.util.ConcurrentModificationException
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895)
   at android.app.ActivityThread.-wrap11()
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616)
   at android.os.Handler.dispatchMessage(Handler.java:106)
   at android.os.Looper.loop(Looper.java:176)
   at android.app.ActivityThread.main(ActivityThread.java:6651)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

Caused by java.util.ConcurrentModificationException
   at androidx.collection.SimpleArrayMap.put(SimpleArrayMap.java:482)
   at com.google.android.gms.measurement.internal.zzin.zza(com.google.android.gms:play-services-measurement-impl@@17.2.2:108)
   at com.google.android.gms.measurement.internal.zzid.onActivityCreated(com.google.android.gms:play-services-measurement-impl@@17.2.2:11)
   at android.app.Application.dispatchActivityCreated(Application.java:199)
   at android.app.Activity.onCreate(Activity.java:1034)
   at androidx.core.app.ComponentActivity.onCreate(ComponentActivity.java:81)
   at androidx.activity.ComponentActivity.onCreate(ComponentActivity.java:149)
   at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:313)
   at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:106)
   at com.project.app.MainActivity.onCreate(MainActivity.java:74)
   at android.app.Activity.performCreate(Activity.java:7088)
   at android.app.Activity.performCreate(Activity.java:7079)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895)
   at android.app.ActivityThread.-wrap11()
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616)
   at android.os.Handler.dispatchMessage(Handler.java:106)
   at android.os.Looper.loop(Looper.java:176)
   at android.app.ActivityThread.main(ActivityThread.java:6651)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

I am sure the problem appeared after changing build.gradle (Module:app).

This is some lines of build.gradle (old version):

implementation 'com.google.android.material:material:1.2.0-alpha02'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta3'
implementation 'com.android.billingclient:billing:2.0.3'
implementation 'com.google.firebase:firebase-ads:18.3.0'
implementation 'com.google.firebase:firebase-core:17.2.1'
implementation 'com.google.firebase:firebase-analytics:17.2.1'
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

This is some lines of build.gradle (new version):

implementation 'com.google.android.material:material:1.2.0-alpha04'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'
implementation 'com.android.billingclient:billing:2.1.0'
implementation 'com.google.firebase:firebase-ads:18.3.0'
//implementation 'com.google.firebase:firebase-core:17.2.2'
implementation 'com.google.firebase:firebase-analytics:17.2.2'
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

I think is due to firebase-analytics:17.2.2, but I'm not sure. How do you think where is the problem? And Do I need to downgrade to the old version?

If all you've done is a basic integration without writing any code, then you should contact Firebase support directly, as the problem appears to be inside the SDK. Make sure you are using the latest version. https://support.google.com/firebase/contact/support — Doug Stevenson, Feb 09 '20 at 20:11
Yes. I upgraded constraintLayout. See my message please, I wrote it in build.gradle (new version) — TimWeb, Feb 10 '20 at 07:24
Having same issue, in other questions people revert com.google.firebase:firebase-analytics:17.2.2 library version to 17.2.1 or lower. https://stackoverflow.com/a/60005457/1775292 — Dmitrijs, Feb 10 '20 at 11:47
I'm facing the same issues after upgrading my mobile ads sdk. — Raunak Sett, Feb 10 '20 at 11:48
@Dmitrijs After downgrading the library to 17.2.1, the errors disappeared. But Firebase support says the errors are related to Material components — TimWeb, Feb 12 '20 at 14:44
@TImWeb I don't think so, my app does not have Material components. Chick linked question, I posted a few solutions there. — Dmitrijs, Feb 12 '20 at 21:39

score 5 · Answer 1 · answered Mar 11 '20 at 09:51

5

Its because firebase-core lib they fixed it in version 17.2.3 see changelog: https://firebase.google.com/support/release-notes/android#analytics_v17-2-3

change your

'com.google.firebase:firebase-core:17.2.1'

to

'com.google.firebase:firebase-core:17.2.3'

answered Mar 11 '20 at 09:51

Daniel Pína

348
2
7

In my case I had this issue with Analytics version 17.2.2 (I don't have firebase-core dependency). After upgrading it to 17.2.3 the problem seems to be solved. Thanks! – YawaraNes Jun 01 '20 at 16:28

How to solve ConcurrentModificationException

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