IssueTracker

Have same problem

java.util.ConcurrentModificationException
        at java.util.WeakHashMap$HashIterator.next(WeakHashMap.java:165)
        at androidx.work.impl.utils.WakeLocks.checkWakeLocks(WakeLocks.java:70)
        at androidx.work.impl.background.systemalarm.SystemAlarmService.onAllCommandsCompleted(SystemAlarmService.java:69)
        at androidx.work.impl.background.systemalarm.SystemAlarmDispatcher.dequeueAndCheckForCompletion(SystemAlarmDispatcher.java:217)
        at androidx.work.impl.background.systemalarm.SystemAlarmDispatcher$DequeueAndCheckForCompletion.run(SystemAlarmDispatcher.java:317)
        at android.os.Handler.handleCallback(Handler.java:615)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4960)
        at java.lang.reflect.Method.invokeNative(Method.java)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
        at dalvik.system.NativeStart.main(NativeStart.java)

Will this be released in the next beta? Thanks

Yes, it will.

Seems like it's still not fixed:

Fatal Exception: java.util.ConcurrentModificationException
       at java.util.WeakHashMap$HashIterator.next(WeakHashMap.java:165)
       at androidx.work.impl.utils.WakeLocks.checkWakeLocks(WakeLocks.java:78)
       at androidx.work.impl.background.systemalarm.SystemAlarmService.onAllCommandsCompleted(SystemAlarmService.java:69)
       at androidx.work.impl.background.systemalarm.SystemAlarmDispatcher.dequeueAndCheckForCompletion(SystemAlarmDispatcher.java:217)
       at androidx.work.impl.background.systemalarm.SystemAlarmDispatcher$DequeueAndCheckForCompletion.run(SystemAlarmDispatcher.java:317)
       at android.os.Handler.handleCallback(Handler.java:810)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:189)
       at android.app.ActivityThread.main(ActivityThread.java:5532)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)

Still happened on beta02, Android 5.0.2

Sample app here: https://issuetracker.google.com/issues/121345393

It's hard to reproduce with SystemAlarmService.onAllCommandsCompleted. Only managed to do it once but it was just luck. The sample app crashes more often though.

I meant this url: https://github.com/rubensousa/WorkManagerConcurrent

Thanks for the bug report and the sample app. Will take another look.

Why are you calling a hidden method (WakeLocks#checkWakeLocks) yourself?

Just to reproduce the crash faster. I don't call this on the production app.

The fix will be available in beta03: https://android-review.googlesource.com/c/platform/frameworks/support/+/876992

Thanks a lot for fixing it quickly ;)