I am looking for FastInfoset sources and javadocs in maven repositories. Have they ever been published to maven repository?
no, we don't publish sources nor javadocs.
You can download them manually on FI download page 
Your use of this web site or any of its content or software indicates your agreement to be bound by these Terms of Participation.
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Oracle and Java are registered trademarks of Oracle and/or its affiliates. Other names may be trademarks of their respective owners.