So here is what I did :
cd ~/mina
svn co http://svn.apache.org/repos/asf/mina/trunk clean-trunk
cd ~/.m2
rm -rf repository (this is where I 'doom' the directory)
cd ~/mina/clean-trunk
mvn clean install
It builds just fine.
You may point to a strange repos, from which Maven is trying to get the
plugin. Here is what I have :
http://repo1.maven.org/maven2/org/codehaus/mojo/build-helper-maven-plugin/1.4/build-helper-maven-plugin-1.4.jar
and you have :
http://repository.codehaus.org/org/codehaus/mojo/build-helper-maven-plugin/
Can you check your maven settings.xml file ?
--
--
cordialement, regards,
Emmanuel Lécharny
www.iktek.com
directory.apache.org