Reading bootstrap class bytecode from Java 7

[Ess Kay]

I am working on a utility currently running on Java 7 which will need to be
able process Java 9 classes and read the Java 9 bootstrap class bytecode
(e.g. java.lang.Object).

Is there a stable, "official" way to read the Java 9 bytecode from Java 7
where there is no "jrt" provider?  Also, is there a stable, "official" way
in which the user can specify the location of the Java 9 modules? Obviously
"java.home" will point to the Java 8.

- Svet