Today I have a look on maven 3 features, when I start to build the maven site of my project it always failed. Because the configuration for the maven site was changed in the maven version 3.X. Here my first maven site configuration that worked for my project:
More about the maven site plugin configuration version for maven version 3.X here:
https://cwiki.apache.org/MAVEN/maven-3x-and-site-plugin.html