OH3 Problem with writing the data, class org.openhab.core.io.rest.sitemap.internal.PageDTO

Maybe your log4j2.xml was not updated.
Please check that commit.

For me the file location is:

 /var/lib/openhab/etc/log4j2.xml

Add the lines:

<!-- Filters warnings from broken connections during startup -->
<!-- https://github.com/openhab/openhab-core/issues/2998 -->
<Logger level="ERROR" name="org.apache.cxf.phase.PhaseInterceptorChain"/>
2 Likes

@kristofejro
Thanks for this hint!
This was the reason …
Now the entries are gone (for now) …

Michael