Generating Javadoc
  Javadoc execution
  Loading source files for package org.apache.maven...
  Constructing Javadoc information...
  Standard Doclet version 1.4.2_10
  Generating target/docs/apidocs/constant-values.html...
  Copying file /home/lukas/.maven/cache/maven-javadoc-plugin-1.8/plugin-resources/stylesheet.css to file target/docs/apidocs/stylesheet.css...
  Building tree for all the packages and classes...
  Building index for all the packages and classes...
  Building index for all classes...
  src/main/org/apache/maven/XmlPomFormatter.java:106: warning - Tag @link: can't find input in org.apache.maven.XmlPomFormatter
  Generating target/docs/apidocs/help-doc.html...
  1 warning