• PLATFORM: JDK27 support added #4072.
• BUGFIX: @SneakyThrows usage on JDK26 no longer results in class files that require lombok.jar to be on the runtime classpath (which should not be neccessary). #4040.
• FEATURE: New config key lombok.checkReturnValueAnnotation (values: none, lombok; default: none) lets lombok generate @lombok.CheckReturnValue on generated methods where the return value should not be ignored, such as @With methods and @Builder.build(). A future lombok release may flip the default to lombok. #4013.
• PROMOTION: @SuperBuilder has been promoted to the main package. Otherwise, no changes have been made to the annotation. The old experimental annotation will remain for a few versions, at which point it will be marked as a deprecated annotation. Eventually it'll be removed. If you had lombok.config configuration for this annotation, the configuration keys for this feature have been renamed. #2209.
• OLD-CRUFT: lombok.experimental.Wither and lombok.Delegate are deprecated remnants; these features were moved (to respectively lombok.With and lombok.experimental.Delegate over 5 years ago. They are now removed entirely. If your project is dependent on an older version of lombok which still has those; fret not, lombok still processes these annotations. It just no longer includes them in the jar.
• FEATURE: CheckerFramework: Lombok now adds @SideEffectFree to constructors it makes if you have enabled checker framework via lombok.config.
• BUGFIX: CheckerFramework: Lombok would add @SideEffectFree to the build() method of any generated builder, even if it is a builder for invoking a method; in that case, the side-effect-free nature of build() mirrors the side-effect-free nature of the method invocation you've built. Lombok now checks if the method it generated a builder for is side effect free / 'check return type'.