Master Spring Boot
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Spring Boot is an opinionated, convention-over-configuration framework built on top of the Spring Framework for Java. It was created by Pivotal (now VMware Tanzu) and released in 2014. Its core promise: build production-ready Spring applications with minimal configuration. Before Spring Boot, setting up a Spring application required hundreds of lines of XML configuration. Spring Boot eliminated almost all of that.

The Spring Framework itself has been the dominant Java enterprise framework since 2003 — handling dependency injection, transaction management, data access, and web MVC. Spring Boot does not replace Spring; it auto-configures it. When you add a dependency for a database, Spring Boot automatically configures a connection pool. When you add web dependencies, it automatically starts an embedded Tomcat server. You write business logic — Spring Boot handles the plumbing.

The problem Spring Boot solves is the setup-to-productivity ratio. Traditional Java enterprise development meant days of configuration before writing a single line of business logic. Spring Boot reduces that to minutes. It also packages your entire application — including the web server — into a single executable JAR file. No separate Tomcat installation, no deployment XML, no container configuration. Run java -jar myapp.jar and your API is live.