Can this program correctly bootstrap OpenJDK8?

[vxtls]

As the title says, I've recently been looking for a way to bootstrap OpenJDK (because the 1.5 download provided by Oracle is a binary version, and I want to bootstrap OpenJDK starting from just a C++ compiler).
I'm not sure about the level of support for this project.

When I am using this project to bootstrap it tell me it need a standart JDK structure, which is

bin/java
bin/javac
rt.jar
...

So, actually, I’d like to confirm whether it’s possible to support bootstrapping as well. I believe the greatest value of this project isn’t just that it can run independently of OpenJDK, but that it can help establish a root of trust. Otherwise, building OpenJDK always involves going through a black-box JDK.

I hope the author sees this and can reply. If you have time, I hope you can continue improving this project!

[vxtls]

If there's already the capability to bootstrap the openjdk, would it be possible to write a documentation file explaining specifically how to do it?