One of the most important web frameworks in java ecology. Spring provides Spring data,Spring security, and other projects to solve all the problems encountered in your web project. Features Create stand-alone Spring applications Embed Tomcat, Jetty or Undertow directly (no need to deploy WAR files) Provide opinionated 'starter' dependencies to simplify your build configuration Automatically configure Spring and 3rd party libraries whenever possible Provide production-ready features such as metrics, health checks, and externalized configuration Absolutely no code generation and no requirement for XML configuration