code: @Nullable
    public static InputStream getInputStream (@Nonnull @Nonempty final String sPath,
                                              @Nonnull final ClassLoader aClassLoader)
    {
      final URL aURL = ClassLoaderHelper.getResource (aClassLoader, sPath);
      return _getInputStream (sPath, aURL, (ClassLoader) null);
    }
docs: Get the input stream of the passed resource using the specified class
  loader only.
  
  @param sPath
  The path to be resolved. May neither be <code>null</code> nor empty.
  @param aClassLoader
  The class loader to be used. May not be <code>null</code>.
  @return <code>null</code> if the path could not be resolved using the
  specified class loader.