How to stop "javax.mail.internet.AddressException: Domain contains illegal character in string" errors

[dbolton]

I get sync error notifications from DAVx5 with every sync. The error is (actual URL changed)

Caused by: net.fortuna.ical4j.data.ParserException: Error at line 7:javax.mail.internet.AddressException: Domain contains illegal character in string ``example@https://example.com/remote.php/caldav/''

Is there a way to get DAVx5 to stop throwing errors (or an easy way to fix this)? The example@https://example.com/remote.php/caldav/ appear hundreds of times in my calendar (and seem to originate from Thunderbird email client and appear after "CN=", "EMAIL=" and "mailto:"). I didn't see a easy way to use find and replace to fix these though since the caldav format has lots of line breaks.

I'm using a Nextcloud-hosted calendar synced with Thunderbird desktop client (with CalDAV Provider installed), Samsung phone (with DAVx5 installed), iPhone, and MacOS calendar.

[rfc2822]

ical4j 3.2.4 has changed the email address validator, but it will still throw an IllegalArgumentException for invalid email addresses.

@sunkup Do you think we can do about this? Or otherwise I think we'd have to create an enhancement request for ical4j to ignore email addresses instead of throwing an exception in relaxed mode.

[sunkup]

When catching the exception we do not get any parsing results and the Event is ignored. Given this I think that unfortunately we can not do something about it at the moment. We will have to create mentioned request for ignoring email addresses when in relaxed mode and maybe do the email validation logic ourselves or in some other way.

Nonetheless it'd be interesting to see the actual raw ical, which produces said exception. Can you provide us with it?

[dbolton]

@sunkup Here's a few sample events (edited to remove personal details)

BEGIN:VEVENT
ATTENDEE;PARTSTAT=;CN="example@https://example.com/remote.php/caldav/<ex
 ample@https//example.com/remote.php/caldav/>";ROLE=REQ-PARTICIPANT;RSVP
 =TRUE:
ATTENDEE;PARTSTAT=;CN="example@https://example.com/remote.php/caldav/<ex
 ample@https//example.com/remote.php/caldav/>";ROLE=CHAIR;RSVP=TRUE:
CLASS:PUBLIC
DTEND;TZID=Central Standard Time:20160620T110000
DTSTAMP:20160701T160744Z
DTSTART;TZID=Central Standard Time:20160620T100000
LOCATION:IWC
ORGANIZER;CN="example@https://example.com/remote.php/caldav/<example@htt
 ps//example.com/remote.php/caldav/>";SCHEDULE-AGENT=CLIENT:
PRIORITY:5
SEQUENCE:0
SUMMARY:Copy: Example
TRANSP:OPAQUE
UID:05ae16b4-36b1-4b98-ae61-e0fc917d9006
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
END:VEVENT

BEGIN:VEVENT
ATTENDEE;PARTSTAT=;CN=example@https//example.com/remote.php/caldav/;ROLE
 =REQ-PARTICIPANT;RSVP=TRUE:MAILTO:example@https//example.com/remote.php
 /caldav/
CLASS:PUBLIC
DTEND;TZID=Central Standard Time:20150312T190000
DTSTAMP:20160106T185110Z
DTSTART;TZID=Central Standard Time:20150312T170000
ORGANIZER;CN=example@https//example.com/remote.php/caldav/;SCHEDULE-AGEN
 T=CLIENT:MAILTO:example@https//example.com/remote.php/caldav/
PRIORITY:5
SEQUENCE:0
SUMMARY:Example
TRANSP:OPAQUE
UID:dd59cc1e-5896-4255-8827-5c39978e3863
END:VEVENT

BEGIN:VEVENT
LAST-MODIFIED:20160105T052421Z
DTSTAMP:20160105T052421Z
UID:14480334331963be9539d94c542fc9ef6e01f4616465d@sufficientlysecure.org
SUMMARY:Example
STATUS:CONFIRMED
ORGANIZER;EMAIL="example@https://example.com/remote.php/caldav/":mailto:
 example@https://example.com/remote.php/caldav/
X-MOZ-LASTACK:20160105T052421Z
DTSTART;TZID=America/Chicago:20160103T103000
DTEND;TZID=America/Chicago:20160103T113000
SEQUENCE:0
TRANSP:OPAQUE
X-MOZ-GENERATION:1
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER;VALUE=DURATION:-PT10M
DESCRIPTION:Example
X-LIC-ERROR;X-LIC-ERRORTYPE=PROPERTY-PARSE-ERROR:Parse error in property na
 me: ACKNOWLEDGED
UID:6761D14C-E90D-4871-950A-677683E5D4B5
X-WR-ALARMUID:6761D14C-E90D-4871-950A-677683E5D4B5
END:VALARM
END:VEVENT

[sunkup]

Thanks for the examples. I am only getting an exception on the third one, but nonetheless, as we can not do anything about it, I opened an issue over at the ical4j repo.