NullPointerException with Team Calendar after deactivation default event type "events"

[F_ Heidemann]

First of all, Team Calendar is great and I love it on the Confluence Servers I use.

While managing a calendar for my team, I encountered a bug with the default event type, resulting in a NullPointException. The following steps are relevant for the problem

• I created a calendar from an imported .ics
• For better usage, I create several custom event types and allocated the events to them
• I deactivated the default event type "events" as I could not rename it to anything useful
• (so far, all is fine, no problems)
• From iOS, I created several events via CalDAV interface
• The created events immediately disappeared after creating, on iOS as well as in Confluence
• When reactivating the default event type "events", the events created from iOS reappeared
• Furthermore, several instances of the "events" type were listed in the right sidepane in the calendar
• Now, when I tried to create a new event via Confluence, an NullPointerException was thrown as seen below

I did not find any reference or similar problems via search, thus I am posting the error here for future reference. Together with the server admin, we could not solve the problem per se. Nevertheless, we solved it with the workaround as follows.

Workaround

• Export the calendar to .ics
• Reimport the calendar from .ics

Stacktrace