Please try adding to the Tomcat context file
<Parameter name="db_timestamp_file" value="[application root]/.timestamp.db"/>
This should eliminate the error message in the log - I'm not sure if it will solve the problem.
The .timestamp.db file helps the application server know when it's time to update the database structure. This is more relevant for development setting than for deployment. In future releases the server won't care if this parameter is missing.
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