ClassNotFoundException when running web-app inside Eclipse IDE

If we have a Maven project and we try to run/debug the project inside the Eclipse IDE to our web server, we need to be sure that all the dependencies are added to the "Deployment Assembly". Check this with Right button in your project hierachy "Properties -> Deployment Assembly". If you don't see the libraries in there, run again mvn eclipse:eclipse -Dwtpversion=2.0 and recheck