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Spring / Spring Boot 4 Basics Interview Questions

What is Spring Boot 4 and when was it released?

Spring Boot 4.0 was released on November 20, 2025, making it the most structurally significant Spring release since the move to Jakarta EE in Spring Boot 3.0 (2022). Spring Boot 4.1 followed on June 10, 2026 and is the current recommended version for new projects.

Spring Boot 4 is described by the Spring team as the beginning of a new generation -- not an incremental update but a genuine architectural shift built on top of Spring Framework 7 and Jakarta EE 11.

Spring Boot 4 at a glance
PropertyDetail
GA releaseNovember 20, 2025 (4.0.0)
Latest stable4.1.0 (June 10, 2026)
Underlying frameworkSpring Framework 7
Jakarta EE baselineJakarta EE 11 (Servlet 6.1, Persistence 3.2, Validation 3.1)
Minimum JavaJava 17
First-class Java supportJava 25
Minimum KotlinKotlin 2.2
Recommended for new projectsSpring Boot 4.1

Key headlines:

  • Complete modularisation into 70+ focused JARs
  • Native API versioning in Spring MVC and WebFlux
  • JSpecify null safety across the entire portfolio
  • Jackson 3 is the new JSON library (Jackson 2 removed)
  • JUnit 4 removed entirely
  • Undertow removed (no Servlet 6.1 support)
  • Built-in retry and concurrency limits via @Retryable and @ConcurrencyLimit
When was Spring Boot 4.0 released as GA?
Which underlying framework version does Spring Boot 4 build on?

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More Related questions...

What is Spring Boot 4 and when was it released? What is the complete modularisation of Spring Boot 4 and why does it matter? What is the Java version baseline in Spring Boot 4 and what Java features does it unlock? What is Jakarta EE 11 and what changes does it bring in Spring Boot 4? How does Spring Boot 4 auto-configuration work and what is the new @AutoConfiguration annotation? What is native API versioning in Spring Boot 4 and how do you use it? What are JSpecify nullability annotations in Spring Boot 4 and why are they important? What changed with Jackson in Spring Boot 4 and what are the migration considerations? What are @Retryable and @ConcurrencyLimit in Spring Boot 4 and how do they work? What are HTTP Service Clients in Spring Boot 4 and how do you define them? What are the key breaking changes removed in Spring Boot 4 that were deprecated in Boot 3? How does Spring Boot 4 handle dependency injection and what are the core stereotypes? What is Spring Boot's application.properties / application.yml and how does configuration work? What are Spring Boot profiles and how do you use them for environment-specific configuration? How does Spring Boot 4 testing work with @SpringBootTest and test slices? What is Spring Boot Actuator and what does it provide in Boot 4? How does Spring Boot 4 handle data access with Spring Data JPA? What is Spring Security in Spring Boot 4 and what are the key Boot 4 changes? What is the Spring Boot starter parent (POM) and how do you set up a Spring Boot 4 project? What is @SpringBootApplication and what does it combine? How do you build REST APIs with Spring Boot 4 using @RestController? How does Bean Validation work with Spring Boot 4? What is Spring Boot's embedded server and how do you configure it? What is Spring Boot's transaction management with @Transactional? What is Spring Boot's caching abstraction and how do you use it? What is Spring Boot's observability stack in Boot 4 with Micrometer and OpenTelemetry? How does Spring Boot 4 support GraalVM native images? What is Spring WebFlux and reactive programming in Spring Boot 4? What is Spring Boot's exception handling with @RestControllerAdvice? How do you use Spring Data MongoDB and other NoSQL stores in Spring Boot 4? How does Spring Boot 4 handle async processing with @Async? What is Spring Boot's externalized configuration with @Value and @ConfigurationProperties? What is Spring Boot's messaging support with Kafka in Boot 4? How do you schedule tasks in Spring Boot 4 with @Scheduled? What is Spring AI and how does it integrate with Spring Boot 4? How does Spring Boot 4 handle logging configuration? What is Spring Boot 4 migration from Boot 3: complete checklist and common pitfalls? What is Spring Boot DevTools and how does it improve development productivity? How does Spring Boot 4 support containerised deployments with Docker? What is the Spring Boot 4 vs Spring Boot 3 comparison and what are the key takeaways?
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