I think you're using the word "container" when perhaps "app server container" is more meaningful. An app server container (like Tomcat, WebLogic, WebSphere, etc

I think you're using the word "container" when perhaps "app server container" is more meaningful. An app server container (like Tomcat, WebLogic, WebSphere, etc.) typically provides services (database connectivity, persistence, management, etc.) to the applications deployed into the app server container, where the benefit is especially useful when multiple applications are deployed in the same container (though in my experience, this is often where problems occur and people end up deploying separate app servers per application). Dropwizard is meant to run without an app server (aka containerless), and uses the Jetty embedded web server (which is not an app server container) to provide the HTTP communication.