This is an alpha release allowing Byteman to be used on JDK9. It does not provide full JDK9 support. It simply allows Byteman to cope with class files generated with a JDK9 version tag and avoids breakage when a jar contains a module-info.class.
This release will operate as normal on JDK6-8. On JDK9 only one issue is expected: members of classes which belong to a named module but are not exported by that module will be inaccessible from Byteman rules. The full 4.0.0 release will restore full access to all public and private members irrespective of module encapsulation.