Maven Archetype plugin encoding warning

Dear community,
I faced the following issue (that I also posted on Stackoverflow:
http://stackoverflow.com/questions/24144073/why-does-maven-warns-me-about-encoding
):
I got an encoding warning even if I set UTF-8 as default encoding.

Please see the SO link for details (problem description and example pom
attached to the question).

Thanks.

Marco Ferrari
Email: ferrari.marco [ at ] gmail.com
Website: http://www.ferrarimarco.info