code: @Override
      public URL findResource(final String _name)
      {
          URL ret = null;
          final String name = _name.replaceAll(System.getProperty("file.separator"), ".").replaceAll(".class", "");
          final byte[] data = loadClassData(name);
          if (data != null && data.length > 0) {
              final File file = FileUtils.getFile(EFapsClassLoader.getTempFolder(), name);
              try {
                  if (!file.exists() || FileUtils.isFileOlder(file, new DateTime().minusHours(1).toDate())) {
                      FileUtils.writeByteArrayToFile(file, data);
                  }
                  ret = file.toURI().toURL();
              } catch (final IOException e) {
                  EFapsClassLoader.LOG.error("Could not geneate File for reading from URL: {}", name);
              }
          }
          return ret;
      }
docs: In case of jbpm this is necessary for compiling,
  because they search the classes with URL.
  @param _name filename as url
  @return URL if found