Spring Framework 6.1 and Spring Boot 3.2 run on Java 21. They make concurrent programming simpler and more efficient with virtual threads, as well as improving reactive programming and Kotlin ...

Spring 5 supports traditional servlet-based and reactive web stacks in the same application. In this article Spring committer Rossen Stoyanchev provides guidance for choosing the appropriate stack.

Reactive programming, in which programs react to events, is gathering steam as a mechanism for programming on multicore processors and for Web development.