This is a quick memento on how to set up tomcat7-maven-plugin and jetty-maven plugin (current version is 8).
It is interesting to note both of these servers are servlet 3.0 compatible.
Setting up Jetty :
Now your can run mvn jetty:run
To set up tomcat-7 plugin, you will have to add either the plugin to the pluginManagement section of your pom (more portable) - see below - or adding the pluginGroup to your settings.xml.
Now your can run mvn tomcat7:run
pluginGroup :
<pluginGroups>
....
<pluginGroup>org.apache.tomcat.maven</pluginGroup>
....
</pluginGroups>