[SOLVED] Zimbra CalDAV servlet fails on "invalid XML character"

[Rich Graves]

(Zimbra support case 00048097; local WHD 5134)

So I've got iCal 3 (OS X 10.5.8) dying on specific shared calendars with "http://1.1.400 bad request to cal.davqueueqbleacctoperation fail."

I found the 400 errors in jetty/logs/access_log.2010-01-08:

1.2.3.4 - - [08/Jan/2010:18:35:08 +0000] "REPORT /dav/test/Test%20User's%20Calendar/ HTTP/1.1" 400 0 "-" "DAVKit/3.0.6 (661); CalendarStore/3.0.8 (860); iCal/3.0.8 (1287); Mac OS X/10.5.8 (9L31a)"

And mailbox.log (strangely 10 seconds behind, after time zone correction):

2010-01-08 12:35:18,329 WARN ... dav - proxy request failed 
org.dom4j.DocumentException: Error on line 1346 of document : Character reference "&#0" is an invalid XML character. Nested exception: Character reference "&#0" is an invalid XML character.
at org.dom4j.io.SAXReader.read(SAXReader.java:350)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at com.zimbra.cs.dav.service.DavServlet.isProxyRequest(DavServlet.java:583)
at com.zimbra.cs.dav.service.DavServlet.service(DavServlet.java:221)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
2010-01-08 12:35:18,374 INFO ... dav - sending http error 400 because
: requested resource is not a calendar collection

Line 1346 of what?

The literal string &#0 does not appear in the .ics export of the calendar. I do see another escape, lots of color="#000000" in embedded HTML, and some binary (hopefully unicode) gunk embedded in Outlook-originated messages.

[inqueue]

Hi Rich,

To track this down, enable DEBUG logging for CalDAV on the grantee account attempting to access the shared calendar, then search for the string in the logging to figure out which appointment it's sitting in. You will be able to edit the appointment summary, save, then sync will work.

zmprov aal grantee@domain.com zimbra.dav debug

Then watch for the string in mailbox.log.

[inqueue]

NULL character in shared appointment summary breaks CalDAV/iCal sync - Bug 43996