code: public static int extractVersionFromSchemaName(String clz_name) {
      int idx = clz_name.lastIndexOf('V');
      if (idx == -1) return -1;
      try { return Integer.valueOf(clz_name.substring(idx+1)); }
      catch( NumberFormatException ex) { return -1; }
    }
docs: Extract the version number from the schema class name.  Returns -1 if
  there's no version number at the end of the classname.