Implementation of Java EE standard

Java EE standard implementations are runtimes that allow us to run the components and provide them with the services specified in the Java EE standard. Such runtimes are called application servers.

Application developers create components based on the specification. Those components are assembled into archives, which can be deployed on application servers.

Application servers allow for the deployment of a number of applications. Furthermore, as hinted at the beginning of this chapter, an application can change the server implementation and deploy archives using the application server from the other vendor: