Jesse brought up a few points about giving credit. I will try to address them.

Boon logging was heavily inspired by the logging that is in Vertx.
Boon int parser was heavily inspired by the int parsing in Jackson.
Boon incorrectly copied comments from PrintWriter and may have been
inspired by code in the OpenJDK.

I believe at all times the usage was small enough and derived enough to
be covered under "fair use".

I have publicly acknowledge the use of int parsing several times on my
blog and to Tatu.

The copied comments I took out. As I want there to be no doubt in
Boon’s commitment to the Apache 2 license.

I have poured through the code looking for other issues, and have found
none.

I believe the perceived violations were minor and covered under fair
use, but copying comments was the wrong thing to do.

There is no code that I know of that has been directly copied from the
OpenJDK other than the comments that Jesse mentioned.

While developing Boon, I have read many blogs about many techniques. I
don’t believe there are any other questionable code copies in Boon, and
again the last update and this one were mostly about attribution and
deleting JavaDoc comments not code.