OpenJDK proposal would replace ASM with an up-to-date and performant API for parsing, generating, and transforming Java class files.

JEP 457, Class-File API (Preview), has been Integrated into JDK 22, proposing a new API for parsing, generating, and transforming Java class files. This API will initially replace ASM within the ...

Java 23, now generally available, includes previews of module import declarations, stream gatherers, structured concurrency, scoped values, and a class-file API. And much more.

Java 24 adds several new features to the language, such as the availability of the Stream Gatherers API and Class-File API, ...