Generating Javadoc
  Javadoc execution
  Loading source file src/java/org/programmersunited/xml/App.java...
  Loading source file src/java/org/programmersunited/xml/Sample.java...
  Loading source file src/java/org/programmersunited/xml/XmlSerializer.java...
  Loading source file src/java/org/programmersunited/xml/XmlElement.java...
  Loading source file src/java/org/programmersunited/xml/XmlRootElement.java...
  Loading source file src/java/org/programmersunited/xml/XmlAttribute.java...
  Constructing Javadoc information...
  Standard Doclet version 1.5.0-beta2
  Building tree for all the packages and classes...
  Generating target/docs/apidocs/constant-values.html...
  Copying file /home/tphilipp/.maven/cache/maven-javadoc-plugin-1.5/plugin-resources/stylesheet.css to file target/docs/apidocs/stylesheet.css...
  Internal error: package sets don't match: [] with: null
  Internal error: package sets don't match: [] with: null
  Internal error: package sets don't match: [] with: null
  Building index for all the packages and classes...
  Building index for all classes...