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The warnings should not appear in the logs if you follow our recommendation to update first to the latest minor release version before upgrading to the most recent major release, see How to update.

H2 does not accept more than one connection

Our default configuration does not use server mode. Therefore, if you try to initiate a backup call using CLI or REST, it fails because H2 does not allow more than one connection at a time. This is a new issue in Magnolia (most likely due to H2 or Jackrabbit updates).

A temporary workaround is to make H2 run in server mode and adding AUTO_SERVER=TRUE in the URL parameters: 

<param name="url" value="jdbc:h2:${wsp.home}/db;AUTO_SERVER=TRUE" />

<param name="url" value="jdbc:h2:${rep.home}/version/db;AUTO_SERVER=TRUE" />

See 

Reloading a page in the editor causes a 404 error

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