To use the jboss maven repository under https://repository.jboss.org/nexus/ you have to add a profile in your settings.xml (~/.m2 or $M2_HOME/conf).
<settings>
...
<profiles>
...
<profile>
<id>jboss-public-repository</id>
<repositories>
<repository>
<id>jboss-public-repository-group</id>
<name>JBoss Public Maven Repository Group</name>
<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
<layout>default</layout>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>jboss-public-repository-group</id>
<name>JBoss Public Maven Repository Group</name>
<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
<layout>default</layout>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
</profiles>
<activeProfiles>
<activeProfile>jboss-public-repository</activeProfile>
</activeProfiles>
...
</settings>
[copied from https://developer.jboss.org/wiki/MavenGettingStarted-Users, 25.02.2015]
Of course you have to activate it.