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The Spring Blog is a resource for developers working with the Spring Framework, providing insights, tutorials, and best practices for building enterprise Java applications. Covering a wide range of topics, including Spring Boot, Spring MVC, and Spring Data, the blog offers practical guidance on application architecture, dependency injection, and integration with other frameworks. Developers can learn how to leverage the power of Spring to create scalable, maintainable, and robust Java applications that meet the demands of modern software development.

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Spring Boot 4 and the Spring portfolio now provide null-safe APIs using JSpecify annotations to help prevent NullPointerExceptions. The Spring team has annotated most major projects including Spring Framework 7, Spring Data 4, and Spring Security 7 with explicit nullability information. Developers can leverage this through IDE support (IntelliJ IDEA 2025.3+) for warnings, or use build-time checkers like NullAway for stricter enforcement. Kotlin 2 automatically translates these annotations to native Kotlin nullability. This allows teams to choose their level of null-safety adoption, from simple IDE warnings to fully null-safe applications, without breaking existing APIs.

Null-Safe applications with Spring Boot 4

Are we fixing “the billion dollar mistake”?