Annotation processor (javac's -processor) that selects the top-level @AutoValhalla classes in a source tree and emits generated value class/value record sources plus a selection manifest. The auto-valhalla-maven-plugin drives it with javac -proc:only and compiles the generated sources with --enable-preview.

Maven plugin that compiles @AutoValhalla classes as JEP-401 value classes (via the JDK 28 compiler with --enable-preview) and packages them as multi-release jar entries, so they run as value classes on JDK 28+ and as ordinary identity ...