Spring Boot 4.0.0 has been released, bringing a host of new features and improvements to the table. This release is a significant upgrade for Java developers looking to leverage the power of Spring for their applications. With the integration of JSpecify, the entire Spring ecosystem now offers enhanced null safety, ensuring more robust and error-free code. The REST client has been simplified, improving type safety and making it easier to declare and invoke REST services. A major highlight is the full support for the latest Java 25 while still maintaining compatibility with Java 17. Developers can now build applications using Gradle 9, although Gradle 8.14+ remains fully supported. This release is built on top of the Spring Framework 7.0, which itself is a substantial update. Additionally, Jackson has been upgraded to version 3.0, which comes with a change in package naming. These updates and enhancements make Spring Boot 4.0 a compelling choice for developers seeking a powerful and flexible framework for building production-grade applications and services with minimal fuss.

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