This has magically stopped happening.
I can only think of two things that could have changed:
* I switched to m2e rather than iam for my Maven plugin in Eclipse.
* I probably got a new snapshot of the dependencies (including the CDK itself) today.
Unfortunately, I won't be looking into it any further; already got what I want. :)
We've seen the issue: it was caused by a bug in JDK 6 JAXP (but I couldn't find this issue in our JIRA). Please file a bug into JIRA about that if you are not using JDK 6 and theh problem still occurs.
Thank you in advance!