iCalendar parsering - ical4j exception

[juham]

Hello!

My Davdroid log:
https://drive.google.com/open?id=1piBL3d3wr6qLw_8kwPRRRUtURsOSZUBX

I am running Davdroid against my own caldav server. Synchronizing(REPORT) VTODOS seems not to work. When looking Davdroid log, I can find ical4j exceptions. With my iCalandar knowledge I can’t find any fatal error in iCalendar content. Could some look my log, if you could say what’s going wrong here.

regards
Juha

 [syncadapter.TasksSyncManager] Received invalid iCalendar, ignoring
EXCEPTION at.bitfire.ical4android.InvalidCalendarException: Couldn't parse iCalendar resource
	at at.bitfire.ical4android.Task$Companion.fromReader(Task.kt:71)
	at at.bitfire.davdroid.syncadapter.TasksSyncManager.processVTodo(TasksSyncManager.kt:165)
	at at.bitfire.davdroid.syncadapter.TasksSyncManager.downloadRemote(TasksSyncManager.kt:149)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.kt:159)
	at at.bitfire.davdroid.syncadapter.TasksSyncAdapterService$TasksSyncAdapter.sync(TasksSyncAdapterService.kt:64)
	at at.bitfire.davdroid.syncadapter.SyncAdapterService$SyncAdapter.onPerformSync(SyncAdapterService.kt:85)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)
Caused by: net.fortuna.ical4j.data.ParserException: Error at line 30:net.fortuna.ical4j.model.component.Daylight cannot be cast to net.fortuna.ical4j.model.component.VAlarm
	at net.fortuna.ical4j.data.CalendarParserImpl.parse(CalendarParserImpl.java:158)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:198)
	at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:178)
	at at.bitfire.ical4android.Task$Companion.fromReader(Task.kt:69)
	... 6 more
Caused by: java.lang.ClassCastException: net.fortuna.ical4j.model.component.Daylight cannot be cast to net.fortuna.ical4j.model.component.VAlarm
	at net.fortuna.ical4j.data.CalendarBuilder$ContentHandlerImpl.endComponent(CalendarBuilder.java:236)
	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$ComponentParser.parse(CalendarParserImpl.java:422)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.access$900(CalendarParserImpl.java:406)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(CalendarParserImpl.java:208)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.parse(CalendarParserImpl.java:422)
	at net.fortuna.ical4j.data.CalendarParserImpl$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)
	... 9 more

Sample iCalandar:
DAV:getcontenttype = GetContentType(type=text/calendar;component=vtodo)]
2018-01-09 15:21:46 3 [DavResource] Ignoring unknown property DAV:status
2018-01-09 15:21:46 3 [DavResource] Received <response> for http://10.0.2.2/juha/neo/rush8crr2a203728.ics
	PARAMETER #0 = [DAV:getetag = 723be14b4c09bc2eb28e7f6209a2d26b, urn:ietf:params:xml:ns:caldavcalendar-data = CalendarData(iCalendar=BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VTIMEZONE
LAST-MODIFIED:20040110T032845Z
TZID:Europe/Kiev
BEGIN:DAYLIGHT
DTSTART:20000404T020000
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20001026T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:EST
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
END:STANDARD
END:VTIMEZONE

BEGIN:VTODO
BEGIN:VTIMEZONE
LAST-MODIFIED:20040110T032845Z
TZID:Europe/Kiev
BEGIN:DAYLIGHT
DTSTART:20000404T020000
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20001026T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:EST
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
END:STANDARD
END:VTIMEZONE
DTSTAMP:20170728T073134
DTSTART;TZID=Europe/Kiev:20160415T000000
DTEND;TZID=Europe/Kiev:20160415T143000
DUE;TZID=Europe/Kiev:20160416T235959
LAST-MODIFIED:20170728T103134
STATUS:NEEDS-ACTION
SUMMARY:Perjantain RUSH muuttui Outlookissa
UID:19970901T130000Z-123404@host.com
END:VTODO
END:VCALENDAR
), DAV:getcontenttype = GetContentType(type=text/calendar;component=vtodo)]

[rfc2822]

http://10.0.2.2/juha/neo/rush8crr2a203728.ics seems to be an invalid iCalendar. Have a look at line 30, but the error may has its root in another line. Can you post this resource (without private data)?

How did you create these tasks?

Does synchronization work when you create the task on your Android device?

[juham]

This iCalandar is generated by a server that I have written myself.

<D:multistatus xmlns:C=“urn:ietf:params:xml:ns:caldav” xmlns:D=“DAV:”>
<D:response>
<D:href>/juha/neo/rush8crr2a203728.ics</D:href>
<D:propstat>
<D:prop>
<D:getetag>“723be14b4c09bc2eb28e7f6209a2d26b”</D:getetag>
<C:calendar-data>
BEGIN:VCALENDAR VERSION:2.0 BEGIN:VTIMEZONE LAST-MODIFIED:20040110T032845Z TZID:Europe/Kiev BEGIN:DAYLIGHT DTSTART:20000404T020000 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4 TZOFFSETFROM:+0200 TZOFFSETTO:+0300 END:DAYLIGHT BEGIN:STANDARD DTSTART:20001026T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:EST TZOFFSETFROM:+0300 TZOFFSETTO:+0200 END:STANDARD END:VTIMEZONE BEGIN:VTODO BEGIN:VTIMEZONE LAST-MODIFIED:20040110T032845Z TZID:Europe/Kiev BEGIN:DAYLIGHT DTSTART:20000404T020000 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4 TZOFFSETFROM:+0200 TZOFFSETTO:+0300 END:DAYLIGHT BEGIN:STANDARD DTSTART:20001026T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:EST TZOFFSETFROM:+0300 TZOFFSETTO:+0200 END:STANDARD END:VTIMEZONE DTSTAMP:20170728T073134 DTSTART;TZID=Europe/Kiev:20160415T000000 DTEND;TZID=Europe/Kiev:20160415T143000 DUE;TZID=Europe/Kiev:20160416T235959 LAST-MODIFIED:20170728T103134 STATUS:NEEDS-ACTION SUMMARY:Perjantain RUSH muuttui Outlookissa UID:19970901T130000Z-123404@host.com END:VTODO END:VCALENDAR
</C:calendar-data>
<D:displayname>Perjantain RUSH muuttui Outlookissa</D:displayname>
<D:getcontenttype>text/calendar;component=vtodo</D:getcontenttype>
<D:status>HTTP/1.1 200 OK</D:status>
</D:prop>
</D:propstat>
</D:response>
</D:multistatus>

[rfc2822]

It seems the iCalendar is invalid. Please double-check it, including the VTIMEZONEs. You may also use a validator.

Also, please use correct formatting for such data. It’s really hard to read it otherwise.

If you think that your iCalendar is correct and it’s a DAVdroid error, please provide an iCalendar file to reproduce the problem.

[juham]

Now I get it to work. Datetime formats where wrong. iCalendar.org validator did not detect these problems. I find this errors using severinghaus.org validator here:. It is based on same iCal4j library.