code: public Collection<String> scanClasses() {
          return scanJar(p -> Files.isRegularFile(p) && p.toString().endsWith(".class") && !isIgnored(p.toAbsolutePath()));
      }
docs: Scans the specified jars for packages and returns a list of all packages found in that jar. The scanner makes no
  distinction between packages and folders.
  
  @return a collection of all classes names found in the jar