Use this information if you need to troubleshoot the JMX Dumper.
Invoking the JMX Dumper can result in a stack trace in the log file. When you open jmx-dumper.zip, it is trying to find a data source defined in the web.xml file. (<res-ref-name>jdbc/dataSource</res-ref-name>), but this data source is not declared in the alfresco.xml file.
To prevent this logging message for appearing, you can configure the data source in the $CATALINA_BASE/conf/[enginename]/[hostname]/alfresco.xml file.