Has anyone noticed a fair number of WARN messages in AEM 6.3sp1? This is just out-of-the-box with some JVM_OPTS configuration and no custom anything loaded to the framework:
"org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate Attempted to perform refresh while thread Apache Sling Resource Provider Change Notifier was concurrently writing to this session. Blocked until the other thread finished using this session. Please review your code to avoid concurrent use of a session."
My first reaction would be to test with a new JDK version but in my case that's not a preferred approach or solution. In consideration of Jorg's past suggestion, I will test it again with no JVM parameters added but I would still be interested if others in the community are seeing these warning and whether someone might have found a little tweak to solve them.