Heisenbug-ish NullPointerExceptions in DataContext.flushToParent()

Hugi Thordarson <[email protected]>
Newsgroups gmane.comp.java.cayenne.user
Message-ID <[email protected]> 
Hi all,

occasionally my users encounter errors when committing changes to the DB. The relevant part of the stack trace looks like this:

---------
org.apache.cayenne.CayenneRuntimeException: [v.4.1 Jul 14 2020 10:26:08] Commit Exception
	at org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:774)
	at org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:691)
	[...removed rest of trace…]
Caused by: java.lang.NullPointerException
---------

Unfortunately I've been unable to reproduce this error, so before I dive into it I'm wondering if this looks familiar to anyone, if there are obvious places to look or if there are recommendations for strategies to debug?

Cheers,
- hugi
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