code: public final void setPackageExtractors(final String packageExtractorImplementations)
              throws IllegalArgumentException {
  
          // Check sanity
          if(packageExtractorImplementations == null) {
              throw new NullPointerException("Cannot handle empty packageExtractorImplementations argument.");
          }
          
          // Instantiate the PackageExtractor instances.
          List<PackageExtractor> extractors = new ArrayList<PackageExtractor>();
          for (String current : splice(packageExtractorImplementations)) {
              try {
  
                  // Load the current PackageExtractor implementation class
                  final Class<?> aClass = getClass().getClassLoader().loadClass(current);
  
                  // The PackageExtractor implementation must have a default constructor.
                  // Fire, and handle any exceptions.
                  extractors.add((PackageExtractor) aClass.newInstance());
              } catch (Exception e) {
                  throw new IllegalArgumentException("Could not instantiate PackageExtractor from class ["
                          + current + "]. Validate that implementation has a default constructor, and implements the"
                          + PackageExtractor.class.getSimpleName() + " interface.");
              }
          }
  
          // Assign if non-null.
          if (extractors.size() > 0) {
              this.packageExtractors = extractors;
          }
      }
docs: Splices the supplied packageExtractorImplementations argument, which is assumed to be a comma-separated
  string holding fully qualified class names of the PackageExtractor implementations which should be used
  by this CorrectPackagingRule.
  
  @param packageExtractorImplementations a comma-separated string holding fully qualified class names of the
  PackageExtractor implementations. Each such class must have a default
  (i.e. no-argument) constructor.
  @throws IllegalArgumentException if the supplied packageExtractorImplementations argument could not yield an
  instantiated PackageExtractor instance.