Spring Boot Demo Representation for configuring the Built-in Embedded Server and Developer Tools.
For more, visit spring.io Official Documentation - Built-in Web Servers
Uisng build-systems.starter configurations
For Application Live-Reload use Dev Tools (Developer Tools) Developer Tools Documentation
‘How-to’ guides- Embedded Web Servers
in28minutes - Spring Boot and Embedded Servers - Tomcat, Jetty and Undertow