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Spring / Spring7 Intermediate to Advanced Interview questions

How does Spring Boot 4 differ from Spring Boot 3 in terms of baseline requirements?

Spring Boot 4 sits on Spring Framework 7, so its baseline shift mirrors the framework's own jump.

RequirementSpring Boot 3Spring Boot 4
Underlying frameworkSpring Framework 6Spring Framework 7
Jakarta EEEE 9/10EE 11
Servlet containerTomcat 10, Jetty 11Tomcat 11+, Jetty 12.1+
Minimum Java17 (Java 11 dropped in 3.x already)17, but 25 strongly recommended

Beyond baselines, Spring Boot 4 also continues a modularization push - splitting some starters into finer-grained artifacts - so teams pull in less unused code, which matters more for container-dense and serverless deployments than it did in Boot 3.

Which Spring Framework generation does Spring Boot 4 build on?
Which servlet container versions does Spring Boot 4 require, versus Boot 3's Tomcat 10?

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