NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference

nike1st

I have the same problem.
1 SOGO server with a shared calander.

When i make a event in de shared calander with time then i get the error.

--- BEGIN DEBUG INFO ---
Account name: nike @ anjo sogo
Authority: org.dmfs.tasks

LOCAL RESOURCE:
LocalTask=[eTag=null, fileName=76d23e9f-ca05-4956-9c42-51f12599365f.ics, flags=0, id=1, task=Task=[classification=null, color=null, completedAt=null, createdAt=1531077792643, description=null, dtStart=null, due=null, duration=null, exDates=[], geoPosition=null, lastModified=1531077792643, location=null, organizer=null, percentComplete=null, priority=0, rDates=[], rRule=null, status=STATUS:NEEDS-ACTION, summary=Test3, url=null, sequence=0, uid=76d23e9f-ca05-4956-9c42-51f12599365f, shadow$_klass_=class at.bitfire.ical4android.Task, shadow$_monitor_=0], taskList=at.bitfire.davdroid.resource.LocalTaskList@4cdb1c8, shadow$_klass_=class at.bitfire.davdroid.resource.LocalTask, shadow$_monitor_=0]

REMOTE RESOURCE:
https://XXX/SOGo/dav/nike@XXX/Calendar/23F-5B22AA80-1-17769D80/76d23e9f-ca05-4956-9c42-51f12599365f.ics

EXCEPTION:
java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference
	at java.text.DateFormat.setTimeZone(DateFormat.java:690)
	at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:77)
	at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:94)
	at net.fortuna.ical4j.model.Date.<init>(Date.java:130)
	at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:235)
	at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:244)
	at net.fortuna.ical4j.model.property.UtcProperty.<init>(UtcProperty.java:67)
	at net.fortuna.ical4j.model.property.DtStamp.<init>(DtStamp.java:94)
	at net.fortuna.ical4j.model.component.VToDo.<init>(VToDo.java:149)
	at net.fortuna.ical4j.model.component.VToDo.<init>(VToDo.java:143)
	at at.bitfire.ical4android.Task.write(Task.kt:133)
	at at.bitfire.davdroid.syncadapter.TasksSyncManager$prepareUpload$1.invoke(TasksSyncManager.kt:83)
	at at.bitfire.davdroid.syncadapter.TasksSyncManager$prepareUpload$1.invoke(TasksSyncManager.kt:42)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.useLocal(BaseDavSyncManager.kt:296)
	at at.bitfire.davdroid.syncadapter.TasksSyncManager.prepareUpload(TasksSyncManager.kt:78)
	at at.bitfire.davdroid.syncadapter.TasksSyncManager.prepareUpload(TasksSyncManager.kt:42)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager$uploadDirty$1$1.invoke(BaseDavSyncManager.kt:142)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager$uploadDirty$1$1.invoke(BaseDavSyncManager.kt:37)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.useRemote(BaseDavSyncManager.kt:303)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager$uploadDirty$1.invoke(BaseDavSyncManager.kt:140)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager$uploadDirty$1.invoke(BaseDavSyncManager.kt:37)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.useLocal(BaseDavSyncManager.kt:296)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.uploadDirty(BaseDavSyncManager.kt:131)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.kt:109)
	at at.bitfire.davdroid.syncadapter.TasksSyncAdapterService$TasksSyncAdapter.sync(TasksSyncAdapterService.kt:64)
	at at.bitfire.davdroid.syncadapter.SyncAdapterService$SyncAdapter.onPerformSync(SyncAdapterService.kt:97)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:272)

SOFTWARE INFORMATION
Package: at.bitfire.davdroid
Version: 1.11.5-gplay (233) from 17 jun. 2018
Installed from: com.android.vending
JB Workaround installed: no

CONNECTIVITY (at the moment)
Active connection: WiFi, CONNECTED

CONFIGURATION
Power saving disabled: no
android.permission.READ_CONTACTS permission: granted
android.permission.WRITE_CONTACTS permission: granted
android.permission.READ_CALENDAR permission: granted
android.permission.WRITE_CALENDAR permission: granted
org.dmfs.permission.READ_TASKS permission: granted
org.dmfs.permission.WRITE_TASKS permission: granted
System-wide synchronization: automatically
Account: nike @ anjo sogo
  Address book sync. interval: 240 min
  Calendar     sync. interval: 15 min
  OpenTasks    sync. interval: 240 min
  WiFi only: false
  [CardDAV] Contact group method: GROUP_VCARDS
  [CalDAV] Time range (past days): 90
           Manage calendar colors: false

SQLITE DUMP
android_metadata
	|  locale |
	|  nl_NL |
----------
services
	|  _id | accountName | service | principal |
	|  2 | nike @ anjo sogo | carddav | https://XXX.com/SOGo/dav/nike@XXX/ |
	|  3 | nike @ anjo sogo | caldav | https://XXXl.com/SOGo/dav/nike@XXX/ |
----------
sqlite_sequence
	|  name | seq |
	|  services | 3 |
	|  homesets | 4 |
	|  collections | 10 |
----------
homesets
	|  _id | serviceID | url |
	|  3 | 2 | https://XXX.com/SOGo/dav/nike@XXX/Contacts/ |
	|  4 | 3 | https://XXX.com/SOGo/dav/nike@XXX.com/Calendar/ |
----------
collections
	|  _id | serviceID | type | url | readOnly | forceReadOnly | displayName | description | color | timezone | supportsVEVENT | supportsVTODO | source | sync |
	|  7 | 2 | ADDRESS_BOOK | https://XXX.com/SOGo/dav/nike@XXX.com/Contacts/personal/ | 0 | 0 | Persoonlijk adresboek | <null> | <null> | <null> | 0 | 0 | <null> | 0 |
	|  8 | 2 | ADDRESS_BOOK | https://XXX.com/SOGo/dav/nike@XXX.com/Contacts/users/ | 0 | 0 | Domain Address Book | <null> | <null> | <null> | 0 | 0 | <null> | 0 |
	|  9 | 3 | CALENDAR | https://XXX.com/SOGo/dav/nike@XXX.com/Calendar/personal/ | 0 | 0 | Persoonlijke agenda | <null> | -5592406 | <null> | 1 | 1 | <null> | 0 |
	|  10 | 3 | CALENDAR | https://XXX.com/SOGo/dav/nike@XXX.com/Calendar/23F-5B22AA80-1-17769D80/ | 0 | 0 | Rene & Anjo | <null> | -5592406 | <null> | 1 | 1 | <null> | 1 |
----------

SYSTEM INFORMATION
Android version: 8.0.0 (R16NW.G930FXXU2EREM)
Device: samsung SM-G930F (herolte)

--- END DEBUG INFO ---

I removed my domain.
I have a samsung galaxy S7 with android 8.0.0

aleh

I have similar issue on my Huawei P10.
Android 8.0
DAVdroid 1.11.5
Fastmail

I removed LOCATION and SUMMARY fields:

[GetContentType(type=text/calendar; charset=utf-8; component=VEVENT), 940227c704a5f09014ae7673e6a401cc62d15679, CalendarData(iCalendar=BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:-//FastMail/1.0/EN
BEGIN:VTIMEZONE
TZID:Europe/Warsaw
BEGIN:STANDARD
DTSTART:19700101T000000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19700101T000000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20180714T140805Z
DTEND;TZID=Europe/Warsaw:20180806T172000
DTSTAMP:20180714T140805Z
DTSTART;TZID=Europe/Warsaw:20180806T164000
LAST-MODIFIED:20180714T140805Z
SEQUENCE:0
TRANSP:OPAQUE
UID:8a2f5a75-618f-4f5f-b708-966f02285a06
END:VEVENT
END:VCALENDAR
)]
2018-07-14 20:54:01 501 [Event] Parsing iCalendar stream
2018-07-14 20:54:01 501 Error loading custom timezone aliases: Attempt to invoke virtual method 'int java.io.Reader.read(char[])' on a null object reference
2018-07-14 20:54:01 501 [syncadapter.SyncManager] Unclassified sync error
EXCEPTION java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference
	at java.text.DateFormat.setTimeZone(DateFormat.java:690)
	at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:77)
	at net.fortuna.ical4j.model.Date.<init>(Date.java:150)
	at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:262)
	at net.fortuna.ical4j.util.Dates.getInstance(Dates.java:223)
	at net.fortuna.ical4j.model.Recur.getDates(Recur.java:600)
	at net.fortuna.ical4j.model.Recur.getDates(Recur.java:520)
	at net.fortuna.ical4j.model.component.Observance.getLatestOnset(Observance.java:231)
	at net.fortuna.ical4j.model.component.VTimeZone.getApplicableObservance(VTimeZone.java:252)
	at net.fortuna.ical4j.model.TimeZone.inDaylightTime(TimeZone.java:137)
	at java.util.TimeZone.getOffsets(TimeZone.java:246)
	at java.util.GregorianCalendar.adjustForZoneAndDaylightSavingsTime(GregorianCalendar.java:2916)
	at java.util.GregorianCalendar.computeTime(GregorianCalendar.java:2807)
	at java.util.Calendar.updateTime(Calendar.java:3397)
	at java.util.Calendar.getTimeInMillis(Calendar.java:1761)
	at java.util.Calendar.getTime(Calendar.java:1734)
	at java.text.SimpleDateFormat.parseInternal(SimpleDateFormat.java:1633)
	at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1528)
	at java.text.DateFormat.parse(DateFormat.java:360)
	at net.fortuna.ical4j.model.DateTime.setTime(DateTime.java:415)
	at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:321)
	at net.fortuna.ical4j.model.property.DateProperty.setValue(DateProperty.java:137)
	at net.fortuna.ical4j.data.CalendarBuilder$ContentHandlerImpl.propertyValue(CalendarBuilder.java:299)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyParser.parse(CalendarParserImpl.java:282)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyParser.access$1100(CalendarParserImpl.java:229)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(CalendarParserImpl.java:210)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.parse(CalendarParserImpl.java:422)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.access$900(CalendarParserImpl.java:406)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(CalendarParserImpl.java:208)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendar(CalendarParserImpl.java:115)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendarList(CalendarParserImpl.java:180)
	at net.fortuna.ical4j.data.CalendarParserImpl.parse(CalendarParserImpl.java:149)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:198)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:178)
	at at.bitfire.ical4android.Event$Companion.fromReader(Event.kt:78)
	at at.bitfire.ical4android.Event$Companion.fromReader$default(Event.kt:72)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.processVEvent(CalendarSyncManager.kt:178)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.access$processVEvent(CalendarSyncManager.kt:39)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$processRemoteChanges$3$$special$$inlined$use$lambda$1.invoke(CalendarSyncManager.kt:162)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$processRemoteChanges$3$$special$$inlined$use$lambda$1.invoke(CalendarSyncManager.kt:39)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.useRemote(BaseDavSyncManager.kt:310)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$processRemoteChanges$3.invoke(CalendarSyncManager.kt:154)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$processRemoteChanges$3.invoke(CalendarSyncManager.kt:39)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.useRemote(BaseDavSyncManager.kt:303)
	at at.bitfire.davdroid.syncadapter.BaseDavSyncManager.useRemoteCollection(BaseDavSyncManager.kt:316)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.processRemoteChanges(CalendarSyncManager.kt:149)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.kt:131)
	at at.bitfire.davdroid.syncadapter.CalendarsSyncAdapterService$CalendarsSyncAdapter.sync(CalendarsSyncAdapterService.kt:56)
	at at.bitfire.davdroid.syncadapter.SyncAdapterService$SyncAdapter.onPerformSync(SyncAdapterService.kt:97)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:272)

Shubhrakant

Re: NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference

chrstn.hntschl

This post is deleted!

chrstn.hntschl

I also encounter the same issue while syncing calendars for 2-3 days. At first it was completely hidden, i.e. no visual information just some short vibrations which I assume to be the indicator for this problem. Manual sync gives the same error as above. I am using android 8.0 on Moto Z. There has not been any system update for a while, so this can’t be the reason! I am using the latest DavDroid (1.11.5-gplay). My backend is latest nextcloud 13.0.4. Do you need any additional information to trace the error? Thunderbird calendar syncs flawlessly…
christian

rfc2822

@chrstn-hntschl If we could only reproduce this problem… Unfortunately, we don’t have an Android 8.0 device, and in the 8.0 emulator, I can’t reproduce the problem.

To dig into this, I’d really need to reproduce that.

TraderJoe

I also experience said problem on Android 8.0.0 (Oneplus 3) with DAVdroid 1.11.5-gplay. The server side backend is Sabre/DAV (like with Nextcloud, Baikal, etc.), though I think that is isn’t a server-side problem (by the information shown in this thread).

@rfc2822 I can reproduce the exception arbitrarily many times by syncing events to the device that have not existed on the device before. The issue occurs specifically for full-day events (that don’t even have any time zone information defined), like the one listed below. Even events I have created on my device, synced to the server and after that forced to resync to the device (by turning the calendar off and on again) face this kind of issue. Maybe this helps for reproducing/debugging the exception?

I will also take a look at the issue tracker of ical4j and provide the same information there.

BEGIN:VCALENDAR
VERSION:2.0
PRODID:+//IDN bitfire.at//DAVdroid/1.11.5-gplay ical4j/2.2.0
BEGIN:VEVENT
DTSTAMP:20180723T194806Z
UID:84019e86-b164-45fe-881f-c1a4ec9b70c1
SUMMARY:#########
LOCATION:#########
DTSTART;VALUE=DATE:20180818
DTEND;VALUE=DATE:20180826
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR

TraderJoe

@traderjoe said in NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference:

I also experience said problem on Android 8.0.0 (Oneplus 3) with DAVdroid 1.11.5-gplay. The server side backend is Sabre/DAV (like with Nextcloud, Baikal, etc.), though I think that is isn’t a server-side problem (by the information shown in this thread).

I just tried to reinstall DAVdroid, which magically fixed the problem. Maybe the information I provided will still help in fixing the original issue.

chrstn.hntschl

I installed the latest nextcloud version (13.0.5) and this seemed to have fixed the problem for the moment, which is strange, since it used to work with 13.0.4 as well at some point…

rfc2822

This post is deleted!

mjsbeaton

This following is a bit of a guess, but this problem only just happened for me, whereas my update to Android 8.0.0 was a while ago - and I have thought of something else which is relevant. (That said, I have also installed some more minor updates from Samsung, fairly recently, though these haven’t changed the displayed version numbers of anything, and I /think/ this was also longer ago than the problem starting…)

Anyway, one thing I have done with my calendars recently - but haven’t ever done with them before - is to change the calender of an event. Google Calendar, which I mainly use, has never allowed this: after an event is first created, you have to delete the event and re-create it in a different calendar. But the Samsung Calendar app (which looks as if it is based on Google Calendar, though I don’t know for sure) /does/ allow you to change the calendar of an event. I only noticed that the Samsung Calendar had this option recently, and I only used it even more recently. Is there any chance that doing this is what triggers the issue?

(I haven’t had a chance to test this further yet, as I haven’t yet had the time to reset my calendar storage to test this, as I’d want to try to figure out all my recent calendar changes since the error started popping up, so as not to lose them, first!)

devvv4ever

@mjsbeaton thanks for your input on this! If you find a way to really re-produce the error we’d be very “happy”. Unfortunately it is happening only very occasionally for users, and we don’t think it’s a special issue of calendar apps. We /think/ it may has to do with some sort of caching in Android 8.0.0. It also never has happened other than on 8.0.0 - so maybe it was an issue that is already fixed on 8.1 and some manufacturers have had the pity to start with an early build of 8.0.0 and now continue to deliver builds containing this bug.

mjsbeaton

Okay, on further testing, it doesn’t seem to be that. I’ve deleted and reinstalled DAVdroid, and it’s actually started working. (I initially saw a DAVdroid permissions notification pop up, and thought I was seeing a repeat of the error - but no, it’s all working!) Then I’ve changed an event’s calendar and it’s still working. I should have tested further before posting - sorry. Will post again if I find anything repeatable of course. Thanks!

hopkins

I have been sent over from here:

https://forums.bitfire.at/topic/1832

I have now reinstalled and the problem seems to have gone away.

NonzeroSums

Newbie to this forum and a novice troubleshooter.

DavDroid v2.0.4-ose (245) via F-droid
Phone: Samsung Galaxy S9 running Android v8.0.0
NextCloud server v13.0.1

This referenced DavDroid error was the Internet search term that brought me to this thread. I don’t know how to interpret info from the DavDroid error dump. I was seeing the problem from another client too, though. Thunderbird with Lightning Calendar add-on on my linux laptop. Thankfully the error/warning message in Thunderbird cited a HTTP return code of 415. I was able to look into the server logs for that error and find the specific(in my case it was only one) .ics entry that was causing this error. I’m not sure how others (citing ics entries above) found the offending entries but I share my experience and troubleshooting path in case someone can make use of it.

Deleting the entry (appended below) cleared away the DavDroid error for me. This was not a new entry and I don’t understand why it would all of a sudden start causing problems but then I don’t actually use an Apple device but the person I’m sharing this calendar with does. So, perhaps their client modified the entry(I’m speculating based on the PRODID)? The HTTP status code of 415, “unsupported media type” might offer a clue to someone more clued in about these data formats too.

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Apple Inc.//Mac OS X 10.12.6//EN
CALSCALE:GREGORIAN
BEGIN:VEVENT
TRANSP:TRANSPARENT
DTEND;VALUE=DATE:20151108
LAST-MODIFIED:20171031T125845Z
UID:84b9619e-a433-44c7-bc8a-f3514903a0d0
DTSTAMP:20171106T145050Z
DESCRIPTION:birth year ?
X-MOZ-GENERATION:3
SEQUENCE:0
CLASS:PUBLIC
CATEGORIES:Birthday
X-MOZ-LASTACK:20171031T125845Z
SUMMARY:Cousin Jamee's bday!
DTSTART;VALUE=DATE:20151107
X-APPLE-TRAVEL-ADVISORY-BEHAVIOR:AUTOMATIC
CREATED:20151129T173905Z
RRULE:FREQ=YEARLY
BEGIN:VALARM
X-WR-ALARMUID:816B6585-D97E-4E0D-BBB3-5108CFA9B644
UID:816B6585-D97E-4E0D-BBB3-5108CFA9B644
TRIGGER:-PT15H
ATTACH;VALUE=URI:Basso
ACTION:AUDIO
X-APPLE-DEFAULT-ALARM:TRUE
ACKNOWLEDGED:20171031T050001Z
END:VALARM
BEGIN:VALARM
X-WR-ALARMUID:CA946A68-9EAF-4A54-A077-E386E08F0F06
UID:CA946A68-9EAF-4A54-A077-E386E08F0F06
TRIGGER:-P1W
ACTION:DISPLAY
X-LIC-ERROR;X-LIC-ERRORTYPE=PROPERTY-PARSE-ERROR:Parse error in property
  name: ACKNOWLEDGED
ACKNOWLEDGED:20171031T050001Z
DESCRIPTION:Default Mozilla Description
END:VALARM
END:VEVENT
END:VCALENDAR

AESiebje

I also experience the error (still do today, quite annoying), and I noticed it is typically connected to one specific entry in my calendar. It is never a full-day event, but always one that has from: and to: times. Simply recreating the same event recreates the problem, but changing it to an all-day event stops the error from appearing. Still, I don’t find that is really a solution.

Galaxy A3 2017
Android 8.0.0
DAV x5 version 2.2.1-gplay (262)

--- BEGIN DEBUG INFO ---
Account name: xxxxxxxx@posteo.net
Authority: com.android.calendar

EXCEPTION:
java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference
	at java.text.DateFormat.setTimeZone(DateFormat.java:690)
	at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:77)
	at net.fortuna.ical4j.model.Date.<init>(Date.java:150)
	at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:262)
	at net.fortuna.ical4j.util.Dates.getInstance(Dates.java:223)
	at net.fortuna.ical4j.model.Recur.getDates(Recur.java:600)
	at net.fortuna.ical4j.model.Recur.getDates(Recur.java:520)
	at net.fortuna.ical4j.model.component.Observance.getLatestOnset(Observance.java:231)
	at net.fortuna.ical4j.model.TimeZone.getRawOffset(TimeZone.java:180)
	at net.fortuna.ical4j.model.TimeZone.<init>(TimeZone.java:69)
	at net.fortuna.ical4j.data.CalendarBuilder$ContentHandlerImpl.endComponent(CalendarBuilder.java:245)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.parse(CalendarParserImpl.java:444)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.access$900(CalendarParserImpl.java:406)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(CalendarParserImpl.java:208)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendar(CalendarParserImpl.java:115)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendarList(CalendarParserImpl.java:180)
	at net.fortuna.ical4j.data.CalendarParserImpl.parse(CalendarParserImpl.java:149)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:198)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:178)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:165)
	at net.fortuna.ical4j.model.TimeZoneLoader.loadVTimeZone(TimeZoneLoader.java:108)
	at net.fortuna.ical4j.model.TimeZoneRegistryImpl.getTimeZone(TimeZoneRegistryImpl.java:181)
	at at.bitfire.ical4android.AndroidEvent.populateEvent(AndroidEvent.kt:172)
	at at.bitfire.davdroid.resource.LocalEvent.populateEvent(LocalEvent.kt:56)
	at at.bitfire.ical4android.AndroidEvent.getEvent(AndroidEvent.kt:107)
	at at.bitfire.davdroid.resource.LocalCalendar.findDirty(LocalCalendar.kt:116)
	at at.bitfire.davdroid.syncadapter.SyncManager.uploadDirty(SyncManager.kt:299)
	at at.bitfire.davdroid.syncadapter.SyncManager$performSync$1.invoke(SyncManager.kt:122)
	at at.bitfire.davdroid.syncadapter.SyncManager$performSync$1.invoke(SyncManager.kt:55)
	at at.bitfire.davdroid.syncadapter.SyncManager.unwrapExceptions(SyncManager.kt:813)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.kt:108)
	at at.bitfire.davdroid.syncadapter.CalendarsSyncAdapterService$CalendarsSyncAdapter.sync(CalendarsSyncAdapterService.kt:55)
	at at.bitfire.davdroid.syncadapter.SyncAdapterService$SyncAdapter.onPerformSync(SyncAdapterService.kt:86)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:272)

SOFTWARE INFORMATION
* at.bitfire.davdroid 2.2.1-gplay (262) from com.android.vending
* org.dmfs.tasks 1.1.13 (6880) from com.android.vending
* com.android.providers.contacts 2.0.44 (204400000)
* com.android.providers.calendar 1.0.00.35 (100000035)
* com.samsung.android.contacts 3.8.20.9 (382000009)
* com.samsung.android.calendar 4.4.04.7 (440400007) from com.sec.android.app.samsungapps

CONNECTIVITY (at the moment)
Active connection: WiFi, CONNECTED

CONFIGURATION
Power saving disabled: yes
android.permission.READ_CONTACTS permission: granted
android.permission.WRITE_CONTACTS permission: granted
android.permission.READ_CALENDAR permission: granted
android.permission.WRITE_CALENDAR permission: granted
org.dmfs.permission.READ_TASKS permission: granted
org.dmfs.permission.WRITE_TASKS permission: granted
System-wide synchronization: automatically
Account: xxxxxxxx@posteo.net
Address book sync. interval: 240 min
Calendar sync. interval: 240 min
OpenTasks sync. interval: 240 min
WiFi only: false
[CardDAV] Contact group method: CATEGORIES
[CalDAV] Time range (past days): 90
Manage calendar colors: true
Address book account: default addressbook (xxxxxxxx@posteo.net 3Q)
Main account: Account {name=xxxxxxxx@posteo.net, type=bitfire.at.davdroid}
URL: https://posteo.de:8443/addressbooks/xxxxxxxx/default/
Sync automatically: true

SQLITE DUMP
android_metadata
	| locale |
	| en_GB |
----------
services
	| _id | accountName | service | principal |
	| 1 | xxxxxxxx@posteo.net | carddav | https://posteo.de:8443/principals/xxxxxxxx/ |
	| 2 | xxxxxxxx@posteo.net | caldav | https://posteo.de:8443/principals/xxxxxxxx/ |
----------
sqlite_sequence
	| name | seq |
	| services | 2 |
	| homesets | 3 |
	| collections | 3 |
----------
homesets
	| _id | serviceID | url |
	| 2 | 2 | https://posteo.de:8443/calendars/xxxxxxxx/ |
	| 3 | 1 | https://posteo.de:8443/addressbooks/xxxxxxxx/ |
----------
collections
	| _id | serviceID | type | url | readOnly | forceReadOnly | displayName | description | color | timezone | supportsVEVENT | supportsVTODO | source | sync | privWriteContent | privUnbind |
	| 2 | 2 | CALENDAR | https://posteo.de:8443/calendars/xxxxxxxx/default/ | 0 | 0 | Standardkalender | <null> | <null> | <null> | 1 | 1 | <null> | 1 | 1 | 1 |
	| 3 | 1 | ADDRESS_BOOK | https://posteo.de:8443/addressbooks/xxxxxxxx/default/ | 0 | 0 | default addressbook | <null> | <null> | <null> | 0 | 0 | <null> | 1 | 1 | 1 |
----------

SYSTEM INFORMATION
Android version: 8.0.0 (R16NW.A320FLXXU3CRH2)
Device: samsung SM-A320FL (a3y17lte)

--- END DEBUG INFO ---

devvv4ever

As already said, we don’t think it is related to DAVx⁵ itself. But reinstalling the app may clear some caches or the calendar storage which is somehow the cause of the problem. Full-day-events don’t have a timezone.

rfc2822

I have now added this to the FAQ: https://www.davx5.com/faq/java-lang-nullpointerexception-java-util-gettimezone

A-2017-U1

I’m able to 100% reproduce this bug, reinstalling the app won’t help though. The problem is that Davdroid is unable to set the TZ that Evolution sets for a CalDAV entry. Here’s the error message I receive :

java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.Calendar.setTimeZone(java.util.TimeZone)' on a null object reference
	at java.text.DateFormat.setTimeZone(DateFormat.java:690)
	at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:77)
	at net.fortuna.ical4j.model.Date.<init>(Date.java:150)
	at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:262)
	at net.fortuna.ical4j.util.Dates.getInstance(Dates.java:223)
	at net.fortuna.ical4j.model.component.Observance.getLatestOnset(Observance.java:230)
	at net.fortuna.ical4j.model.TimeZone.getRawOffset(TimeZone.java:180)
	at net.fortuna.ical4j.model.TimeZone.<init>(TimeZone.java:69)
	at net.fortuna.ical4j.data.CalendarBuilder$ContentHandlerImpl.endComponent(CalendarBuilder.java:245)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.parse(CalendarParserImpl.java:444)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.access$900(CalendarParserImpl.java:406)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(CalendarParserImpl.java:208)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendar(CalendarParserImpl.java:115)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendarList(CalendarParserImpl.java:180)
	at net.fortuna.ical4j.data.CalendarParserImpl.parse(CalendarParserImpl.java:149)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:198)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:178)
	at at.bitfire.ical4android.Event$Companion.fromReader(Event.kt:78)
	at at.bitfire.ical4android.Event$Companion.fromReader$default(Event.kt:72)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.processVEvent(CalendarSyncManager.kt:159)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.access$processVEvent(CalendarSyncManager.kt:41)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1$1.invoke(CalendarSyncManager.kt:144)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1$1.invoke(CalendarSyncManager.kt:41)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemote(SyncManager.kt:798)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1.invoke(CalendarSyncManager.kt:131)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2$1.invoke(CalendarSyncManager.kt:41)
	at at.bitfire.dav4android.Response$Companion.parse(Response.kt:211)
	at at.bitfire.dav4android.DavResource$processMultiStatus$2.invoke(DavResource.kt:465)
	at at.bitfire.dav4android.DavResource.processMultiStatus(DavResource.kt:484)
	at at.bitfire.dav4android.DavResource.processMultiStatus(DavResource.kt:435)
	at at.bitfire.dav4android.DavCalendar.multiget(DavCalendar.kt:151)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2.invoke(CalendarSyncManager.kt:130)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$downloadRemote$2.invoke(CalendarSyncManager.kt:41)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemote(SyncManager.kt:787)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemoteCollection(SyncManager.kt:808)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.downloadRemote(CalendarSyncManager.kt:129)
	at at.bitfire.davdroid.syncadapter.SyncManager$syncRemote$1$1.run(SyncManager.kt:447)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
	at java.lang.Thread.run(Thread.java:764)

and this is the entry that causes this:

BEGIN:VCALENDAR
CALSCALE:GREGORIAN
PRODID:-//Ximian//NONSGML Evolution Calendar//EN
VERSION:2.0
BEGIN:VTIMEZONE
TZID:/freeassociation.sourceforge.net/Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19160429T230000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19160430T220000Z;BYDAY=-1SU;BYMONTH=4
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19161007T010000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19160930T230000Z;BYDAY=1SU;BYMONTH=10
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19170416T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19180415T010000Z;BYDAY=3MO;BYMONTH=4
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19170917T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19180916T010000Z;BYDAY=3MO;BYMONTH=9
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19400402T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19400401T010000Z;BYDAY=1MO;BYMONTH=4
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19421105T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19421102T010000Z;BYDAY=1MO;BYMONTH=11
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19430326T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19430329T010000Z;BYDAY=-1MO;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19431001T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19441002T010000Z;BYDAY=1MO;BYMONTH=10
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19440402T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19450402T000000Z;BYDAY=1MO;BYMONTH=4
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:CEMT
DTSTART:19450524T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
RRULE:FREQ=YEARLY;UNTIL=19450523T230000Z;BYDAY=-2TH;BYMONTH=5
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19450924T030000
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19450924T020000Z;BYDAY=-1MO;BYMONTH=9
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19451118T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19451118T020000Z;BYDAY=3SU;BYMONTH=11
END:STANDARD
BEGIN:STANDARD
TZNAME:CET
DTSTART:19460102T000000
TZOFFSETFROM:+0100
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19451231T220000Z;BYDAY=1TU;BYMONTH=1
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19460408T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19460414T010000Z;BYDAY=2SU;BYMONTH=4
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19461001T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19461007T010000Z;BYDAY=1MO;BYMONTH=10
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19470401T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19470406T010000Z;BYDAY=1SU;BYMONTH=4
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:CEMT
DTSTART:19470513T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
RRULE:FREQ=YEARLY;UNTIL=19470511T000000Z;BYDAY=2SU;BYMONTH=5
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19470624T030000
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19470629T020000Z;BYDAY=-1SU;BYMONTH=6
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19471007T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19491002T020000Z;BYDAY=1SU;BYMONTH=10
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19480415T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19480418T010000Z;BYDAY=3SU;BYMONTH=4
END:DAYLIGHT
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19490408T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19490410T010000Z;BYDAY=2SU;BYMONTH=4
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19800102T000000
TZOFFSETFROM:+0100
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19791231T220000Z;BYDAY=1TU;BYMONTH=1
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19800401T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;UNTIL=19800406T010000Z;BYDAY=1SU;BYMONTH=4
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19800930T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;UNTIL=19950924T010000Z;BYDAY=-1SU;BYMONTH=9
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:19810325T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
DTSTART:19961028T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:29499b32bcbfd6e8d587877903d31f8b4197ef37
DTSTAMP:20180507T042915Z
DTSTART;TZID=/freeassociation.sourceforge.net/Europe/Berlin:
 20181112T173000
DTEND;TZID=/freeassociation.sourceforge.net/Europe/Berlin:
 20181112T190000
SEQUENCE:2
SUMMARY:St. Martinsfest
LOCATION:Kita Buntspecht
TRANSP:OPAQUE
CLASS:PUBLIC
CREATED:20180507T052305Z
LAST-MODIFIED:20180507T052305Z
BEGIN:VALARM
X-EVOLUTION-ALARM-UID:ca54afeb78f18a27d0334eb25167ccec92e77f6f
ACTION:DISPLAY
TRIGGER;RELATED=START:-PT5M
END:VALARM
END:VEVENT
END:VCALENDAR

The problematic line(s) are the ones with

TZID=/freeassociation.sourceforge.net/Europe/Berlin:

Changing this to a known TZ solves the problematic sync. This problem is new to my installations but 100% reproducible on different devices. Nextcloud Calendar, K-Mail or Evolution don’t have problems with this entries, only Davdroid on my two Android 8.0 devices.

rfc2822

@A-2017-U1 Which Android 8.0 device? Can you please provide the debug info? I can try once again in Android 8 emulator, but I guess I won’t be able to reproduce the problem (like always).