code: List<File> findNonJdkJars() throws IOException, SAXException, XPathExpressionException, ParserConfigurationException {
          Enumeration<URL> manifests = LibraryVersions.class.getClassLoader().getResources("META-INF/MANIFEST.MF");
          String javaHome = System.getProperty("java.home");
          List<File> ret = new LinkedList<File>();
          while (manifests.hasMoreElements()) {
              URL u = manifests.nextElement();
              // jar:file:/home/username/.m2/repository/org/slf4j/slf4j-jdk14/1.5.0/slf4j-jdk14-1.5.0.jar!/META-INF/MANIFEST.MF
              // we're not interested if it's not a jar, although how you'd have a MANIFEST.MF which wasn't in a jar?
              if (u.getProtocol().equals("jar")) {
                  // file:/home/username/.m2/repository/com/betfair/tornjak/kpi/3.0-SNAPSHOT/kpi-3.0-SNAPSHOT.jar!/META-INF/MANIFEST.MF
                  String file = u.getFile();
                  // file:/home/username/.m2/repository/com/betfair/tornjak/kpi/3.0-SNAPSHOT/kpi-3.0-SNAPSHOT.jar
                  file = file.substring(0, file.indexOf("!"));
                  // /home/username/.m2/repository/com/betfair/tornjak/kpi/3.0-SNAPSHOT/kpi-3.0-SNAPSHOT.jar
                  file = file.substring(5);
                  // remove %20 etc
                  file = URLDecoder.decode(file, "UTF-8");
                  File f = new File(file);
                  String canonicalPath = f.getCanonicalPath();
                  if (!canonicalPath.startsWith(javaHome)) {
                      ret.add(f);
                  }
              } else {
                  logger.info("Can't include code in checksum which isn't in a JAR: " + u);
              }
          }
          return ret;
      }
docs: package private for testing purposes