code: protected ClassMapping createClassMapping (short code, String cname)
          throws IOException, ClassNotFoundException
      {
          // resolve the class and streamer
          ClassLoader loader = (_loader != null) ? _loader :
              Thread.currentThread().getContextClassLoader();
          Class<?> sclass = Class.forName(cname, true, loader);
          Streamer streamer = Streamer.getStreamer(sclass);
          if (STREAM_DEBUG) {
              log.info(hashCode() + ": New class '" + cname + "'", "code", code);
          }
  
          // sanity check
          if (streamer == null) {
              String errmsg = "Aiya! Unable to create streamer for newly seen class " +
                  "[code=" + code + ", class=" + cname + "]";
              throw new RuntimeException(errmsg);
          }
  
          return new ClassMapping(code, sclass, streamer);
      }
docs: Creates and returns a class mapping for the specified code and class name.