[saurik]

This is the exact opposite of what I got from reading this blog post... Jack is what did the bad stuff you are talking about, Jill was (apparently: I hadn't read much about it before today) a mitigation for that badness (by allowing you to "link" in .class files), and they finally decided to throw all that away and go back to actually (correctly, in my book) supporting the old javac->dx flow (which guarantees that if they are going to support Java 8, and this blog posts claims they are intending to do so, that they do it by supporting the bytecode correctly, as now all source code has to go through this path and the Java ecosystem of code transformers will continue to work as expected).