Spring Boot 2.1.7.RELEASE requires
* Java 8 +
* Spring Framework 5.1.9 +
Explicit build support
* Maven 3.3+
* Gradle 4.4+
Servlet Container Support
* Tomcat 9.0 – Servlet Version 4.0
* Jetty 9.4 – Servlet Version 3.1
* Undertow 2.0 – Servlet Version 4.0
