NPE "Attempt to read from null array" when writing VEVENT

[Massedil]

Problem scope

• I'm sure that this is a DAVx⁵ problem.

App version

• I'm using the latest available DAVx⁵ version.

Android version and device/firmware type

15 (lineage_a52sxq-userdebug)

Steps to reproduce

I'm not sure. But I think there was a sync when I was creating an event in Etar.

Something like :

• Create an event in Etar
• Switch to the web app to copy event info
• DavX tries to sync
• Switch to Etar and finish and save the event
• Go to davx5 to force sync and see if the error is still here : no error anymore !

Actual result

EXCEPTION
java.lang.NullPointerException: Attempt to read from null array
	at net.fortuna.ical4j.model.component.Observance.getCachedOnset(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:21)
	at net.fortuna.ical4j.model.component.Observance.getLatestOnset(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:88)
	at at.bitfire.ical4android.ICalendar$Companion.minifyVTimeZone(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:37)
	at at.bitfire.synctools.icalendar.ICalendarGenerator.write(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:199)
	at at.bitfire.davdroid.sync.CalendarSyncManager.generateUpload$app(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:112)
	at at.bitfire.davdroid.sync.CalendarSyncManager.generateUpload$app(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:163)
	at at.bitfire.davdroid.sync.SyncManager.uploadDirty$suspendImpl(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:141)
	at at.bitfire.davdroid.sync.SyncManager.uploadDirty(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:1)
	at at.bitfire.davdroid.sync.SyncManager.uploadDirty$default(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:8)
	at at.bitfire.davdroid.sync.SyncManager$uploadDirty$2$1$1.invokeSuspend(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:33)
	at at.bitfire.davdroid.sync.SyncManager$uploadDirty$2$1$1.invoke(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:9)
	at at.bitfire.davdroid.sync.SyncManager$uploadDirty$2$1$1.invoke(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:14)
	at at.bitfire.davdroid.sync.SyncException$Companion.wrapWithLocalResourceSuspending(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:67)
	at at.bitfire.davdroid.sync.SyncManager$uploadDirty$2$1.invokeSuspend(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:38)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:9)
	at kotlinx.coroutines.DispatchedTask.run(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:114)
	at androidx.core.app.ActivityRecreator$1.run(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:11)
	at kotlinx.coroutines.scheduling.TaskImpl.run(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:3)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(r8-map-id-33936d9e6d681d0995265b121ccbb1590427a15578f9cf5b7e4025d4b078f3ca:88)

Expected result

no crash !

Further info

debug-info.txt

[rfc2822]

I can't reproduce the problem here.

Does it happen every time when you create an event, or only for that specific event?

If you delete that specific event and create it again, does the problem occur again?

[Massedil]

Does it happen every time when you create an event, or only for that specific event?

It only occurred one time, it has not occurred again since my report.

[rfc2822]

OK since I can't reproduce the problem, we can't do much here. When we update to the latest ical4j library (version 4.x – bitfireAT/synctools#112), these problems hopefully also go away or will at least be better testable.

If it happens again, feel free to post again …