[vbezhenar]

Imagine keycloak. It's classical enterprise Java application with database. You can deploy it as WAR file with configured JDBC connection.

But people who use keycloak often have little idea what Java is. They write code in Go and call Keycloak interfaces via REST API. They just need to start that thing and connect to some database.

With docker they'll get it up and running in minutes.

With EAR they'll spend next few days I bet it.