Internal server error for events without end date

[esprit libre]

Hello,
I try DAVdroid and in some cases stops sync with error. I try with different types of events and discover that DAVdroid seems not supporting an event without ending date.
Does some have the same problem? Know how to solve it?
Best regards,
Thomas

[esprit libre]

Sorry, I forget to give a bit more info :

SYNCHRONIZATION INFO
Synchronization phase: 7
Account name: testing
Authority: com.android.calendar

HTTP REQUEST:
REPORT /cdav/server.php/calendars/user/1-cal-user/
Content-Length: 328
Content-Type: application/xml; charset=utf-8
Depth: 1

<?xml version='1.0' encoding='UTF-8' ?><CAL:calendar-query xmlns="DAV:" xmlns:CAL="urn:ietf:params:xml:ns:caldav"><prop><getetag /></prop><CAL:filter><CAL:comp-filter name="VCALENDAR"><CAL:comp-filter name="VEVENT"><CAL:time-range start="20160629T150123Z" /></CAL:comp-filter></CAL:comp-filter></CAL:filter></CAL:calendar-query>

HTTP RESPONSE:
http/1.1 500 Internal Server Error
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Connection: close
Content-Length: 257
Content-Type: application/xml; charset=utf-8
Date: Tue, 27 Sep 2016 13:01:48 GMT
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Pragma: no-cache
Server: Apache/2.2.22 (Debian)
X-Sabre-Version: 3.0.8

<?xml version="1.0" encoding="utf-8"?>[LF]
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">[LF]
  <s:sabredav-version>3.0.8</s:sabredav-version>[LF]
  <s:exception>ErrorException</s:exception>[LF]
  <s:message>Uninitialized string offset: 0</s:message>[LF]
</d:error>[LF]


EXCEPTION:
at.bitfire.dav4android.exception.HttpException: 500 Internal Server Error
	at at.bitfire.dav4android.DavResource.checkStatus(DavResource.java:316)
	at at.bitfire.dav4android.DavResource.checkStatus(DavResource.java:289)
	at at.bitfire.dav4android.DavCalendar.calendarQuery(DavCalendar.java:88)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.listRemote(CalendarSyncManager.java:126)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.java:161)
	at at.bitfire.davdroid.syncadapter.CalendarsSyncAdapterService$SyncAdapter.onPerformSync(CalendarsSyncAdapterService.java:69)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:254)

SOFTWARE INFORMATION
DAVdroid version: 1.2 (109) Sun Jul 03 15:15:13 UTC+02:00 2016
Installed from: org.fdroid.fdroid
JB Workaround installed: no

CONFIGURATION
System-wide synchronization: automatically
Account: testing
  Address book sync. interval: 240 min
  Calendar     sync. interval: 240 min
  OpenTasks    sync. interval: —
  Preemptive auth: true
  WiFi only: false
  [CardDAV] Contact group method: GROUP_VCARDS
            RFC 6868 encoding: true
  [CalDAV] Time range (past days): 90
           Manage calendar colors: true

SQLITE DUMP
android_metadata
	|  locale |
	|  fr_FR |
----------
settings
	|  setting | value |
	|  hint_OpenTasksNotInstalled | 0 |
----------
services
	|  _id | accountName | service | principal |
	|  13 | testing | carddav | https://my.server.com/cdav/server.php/principals/user/ |
	|  14 | testing | caldav | https://my.server.com/cdav/server.php/principals/user/ |
----------
sqlite_sequence
	|  name | seq |
	|  services | 14 |
	|  collections | 38 |
	|  homesets | 24 |
----------
homesets
	|  _id | serviceID | url |
	|  22 | 13 | https://my.server.com/cdav/server.php/addressbooks/user/ |
	|  24 | 14 | https://my.server.com/cdav/server.php/calendars/user/ |
----------
collections
	|  _id | serviceID | url | readOnly | displayName | description | color | timezone | supportsVEVENT | supportsVTODO | sync |
	|  33 | 13 | https://my.server.com/cdav/server.php/addressbooks/user/default/ | 0 | Dolibarr | Contacts Dolibarr user | <null> | <null> | <null> | <null> | 0 |
	|  38 | 14 | https://my.server.com/cdav/server.php/calendars/user/1-cal-user/ | 0 | user | SuperAdmin | <null> | <null> | 1 | 1 | 1 |
----------

SYSTEM INFORMATION
Android version: 4.2.2 (JDQ39.S7275RXXUAOJ1)
Device: Samsung GT-S7275R (loganrelte)

[rfc2822]

Hello,

As you can see, this is an internal server error:

http/1.1 500 Internal Server Error

<?xml version="1.0" encoding="utf-8"?>[LF]
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">[LF]
  <s:sabredav-version>3.0.8</s:sabredav-version>[LF]
  <s:exception>ErrorException</s:exception>[LF]
  <s:message>Uninitialized string offset: 0</s:message>[LF]
</d:error>[LF]

Please contact your server vendor; it’s not a DAVdroid problem.

[esprit libre]

Hello,
that’s what I though first, but I made this test :

• new calendar, single event without ending date
  -> sync is ok with Thunderbird/SoGo
  -> sync error with DAVdroid. Error message from this test is the one in my second post
• same calendar, edit this single event by adding ending date
  -> sync is ok with Thunderbird/SoGo
  -> sync is ok with DAVdroid

How investigate more? HTTP flow should help, maybe… I can capture it with wireshark.
Thanks a lot.
Thomas

[rfc2822]

@esprit-libre Thunderbird probably doesn’t use the same REPORT calendar-query request, so that the server error (which occurs when the server tries to process the events in order to process the REPORT calendar-query request) doesn’t occur.

You can create a new calendar, upload a single event, and then have a look whether the problem occurs. If it does, you have a look at the uploaded event, and the current event in the server’s database.

However, it’s clearly a server problem, so I suggest to report it to the server vendor and continue discussion there. Which server do you use?

BTW: Android doesn’t support events without end dates. All-day events will become assigned end := start + 1 day, the other events end := start.