TCP and file system access use JNI under the hood as well. For most other use cases there are already libraries that provide wrappers. And after Panama is shipp

TCP and file system access use JNI under the hood as well. For most other use cases there are already libraries that provide wrappers. And after Panama is shipped, they will eventually be upgraded to use that faster FFI. Btw, aren't serial devices treated as files under Unix?