IssueTracker

We have same issue.

Version used: WorkManager 2.1.0-alpha01
Devices/Android versions reproduced on:  mostly Android 5 & 6

Fatal Exception: java.lang.RuntimeException: Error receiving broadcast Intent { act=android.net.conn.CONNECTIVITY_CHANGE flg=0x4000010 (has extras) } in androidx.work.impl.constraints.trackers.NetworkStateTracker$NetworkStateBroadcastReceiver@c5142c8
       at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:876)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697)
Caused by java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@64a6d62 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@16d09ef3[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
       at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2011)
       at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:793)
       at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:298)
       at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:503)
       at java.util.concurrent.Executors$DelegatedScheduledExecutorService.schedule(Executors.java:644)
       at androidx.work.impl.background.systemalarm.WorkTimer.startTimer(WorkTimer.java:82)
       at androidx.work.impl.background.systemalarm.DelayMetCommandHandler.onAllConstraintsMet(DelayMetCommandHandler.java:100)
       at androidx.work.impl.constraints.WorkConstraintsTracker.onConstraintMet(WorkConstraintsTracker.java:150)
       at androidx.work.impl.constraints.controllers.ConstraintController.updateCallback(ConstraintController.java:134)
       at androidx.work.impl.constraints.controllers.ConstraintController.onConstraintChanged(ConstraintController.java:141)
       at androidx.work.impl.constraints.trackers.ConstraintTracker.setState(ConstraintTracker.java:103)
       at androidx.work.impl.constraints.trackers.NetworkStateTracker$NetworkStateBroadcastReceiver.onReceive(NetworkStateTracker.java:170)
       at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:866)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       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:902)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697)

liujian16@: Are you sure this is happening on Android 6? Because the stack trace points to DelayMetCommandHandler (which is something that the AlarmManager based implementation uses) which is only used on API <= 22.

nihansin@: Sorry its not clear what you meant by

"WorkManager 2.1.0-alpha01
I know 2.1.0-alpha02 is out but I cannot test it as I CANNOT reproduce this issue on both alpha01 and 02."

Did you mean that you cannot reproduce this on your own but you see this happen in production ?

My guess is something like this might be happening:

If you have a Worker in RUNNING state, and you have been asked to stop (either because constraints are no longer met  / or if you called cancel()) your Worker still needs to cooperatively cancel.
If your Worker never stops running, then WorkTimer will try and shutdown your Worker again (in 10 minutes). This time that will fail, because the Executor has already been shutdown.
This typically stems from a bug in your code (because your Worker never stopped).

Can you please turn on WorkManager's logging so it will better help us diagnose the problem ?
For this you need to use custom initialization. Something like:

Configuration configuration = new Configuration.Builder()
    .setMinimumLoggingLevel(Log.VERBOSE)
    .build();

WorkManager.initialize(context, configuration);

Make sure you disable the default initializer.