Record a Phone Message with Java

This is a tutorial on how to receive a phone call, record a message, and display the recording URL using Java and the Spark framework with Vonage API. To complete this tutorial, you need a Vonage API account, a virtual phone number, and a copy of the JDK installed. The tutorial covers setting up a new Java project with Gradle, defining routes for answering calls and logging recordings, purchasing a phone number and configuring your application to use it, exposing your application to the internet using ngrok, and testing your application. The tutorial provides an example of how to create an application that can receive a phone call, record a message, and display the recording URL in a few lines of code.