in src/main/java/org/apache/maven/shared/jar/classes/JarClasses.java [68:75]
public JarClasses() {
// Unique list decorators are used to ensure natural ordering is retained, the list interface is availble, and
// that duplicates are not entered.
imports = SetUniqueList.setUniqueList(new ArrayList<>());
packages = SetUniqueList.setUniqueList(new ArrayList<>());
classNames = SetUniqueList.setUniqueList(new ArrayList<>());
methods = SetUniqueList.setUniqueList(new ArrayList<>());
}