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Spring Boot

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description Spring Boot Overview

Spring Boot is a framework for building robust Java enterprise applications. It streamlines development through automated configuration, including integrated web servers. This simplifies creating APIs and backend systems, particularly beneficial for developers familiar with the Spring ecosystem seeking efficient application deployment and management. It’s commonly used by professional software engineers and teams developing complex server-side solutions.

help Spring Boot FAQ

What is the difference between Spring Boot and the Spring Framework?

Spring Boot is built on top of the Spring Framework and adds auto-configuration, embedded servers, and opinionated starter dependencies so you can run an application with minimal manual setup. The Spring Framework itself provides the core IoC container, dependency injection, and AOP features, but requires you to manually wire XML or Java configuration and deploy to an external servlet container.

Which embedded server does Spring Boot use by default?

Spring Boot uses Apache Tomcat as its default embedded servlet container when you include the spring-boot-starter-web dependency. You can switch to Jetty or Undertow by excluding the Tomcat starter and adding the corresponding jetty or undertow starter to your pom.xml or build.gradle.

Can I package a Spring Boot app as a WAR file for deployment to an external server?

Yes, you can convert a Spring Boot JAR application to a deployable WAR by extending SpringBootServletInitializer in your main class and changing the packaging in your build file. This allows deployment to external containers like Tomcat, WebLogic, or JBoss, though you lose the benefit of the embedded server.

What minimum Java version does Spring Boot 3 require?

Spring Boot 3.x requires Java 17 as the baseline, a significant jump from Spring Boot 2.x which supported Java 8. Spring Boot 3 also migrates from javax to jakarta namespace packages (e.g., jakarta.servlet instead of javax.servlet), reflecting the adoption of Jakarta EE 9+ specifications.

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