This SMS dashboard in Java using Spring Boot and Twilio allows users to send SMS messages to multiple recipients with a timely channel for critical notification messages. The development environment includes Java 8 or newer, the Spring Initializr tool, and Twilio account setup. The front-end is configured using Thymeleaf templating engine, while the back-end uses Spring Web and Twilio helper library. A new controller class, SMSController, is created to handle sending messages, which initializes Twilio with the account SID and Auth Token from application.properties. The code also includes a MessageDetails inner class to parse JSON posted in from the dashboard. After setting up the environment and adding dependencies, users can run the application and test it by adding contacts and sending SMS messages.