Im using maven with tomcat7-maven plugin and its working quite well. Recently I noticed a message saying
At least one JAR was scanned for TLDs yet contained no TLDs.
Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them.
Believe the property jarsToSkip is a "catalina.properties" entry. Where ever your Tomcat conf folder is look at file "catalina.properties" and you should see a property like this around line 90 or so:
You should be able to add jars to that list to prevent them from being scanned.
As far as finding which jars are causing the issues, that would be a little more difficult to determine. Probably some trial and error work to be done there.