How to `mobile-install` a desugared app that has JDK 21 dependencies?

[IndiTheo]

I'm building an app that depends on a library specifically built for JVM 21. As the java tools use JDK 17, there's an error from DesugarDexSharding:

Error: java.lang.IllegalArgumentException: Unsupported class file major version 65

What's the recommended way to deal with this, and what will be the eventual fix?

[ted-xie]

I'm surprised to see this error, since DesugarDexSharding's JDK version is set by --tool_java_runtime_version and should be independent of app code, but JDK 17 is just the minimum --tool_java_runtime_version/--java_runtime_version. You should be able to set these values higher if you want.