13-dic-2011 17.00.36 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in producti
Looking at the exception you get, this looks like a problem with publishing your WEB-App (eg. Eclipse WTP could mess something up). First things that come in my mind:
Check your Tomcat server settings: go to Servers - double click on your server. Get your 'Server Locations - Server Path' and check if it exists and check the user/group read/write permissions. eg. ls -lh somepath/.medadata/.plugins/.org.eclipse.wst.server.core/tmp0 You must be owner or at least in same group for the folder.
Clean the eclipse workspace. (Project - clean all)
Clean/Republish your wep-app (right click on server, clean, publish).
Check if the application is published, there should be a folder named Preventini in /home/claudio/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ Also check the permissions here again (see above).