code: public Serializer getSerializer(Class cl)
          throws HessianProtocolException {
          Serializer serializer;
  
          serializer = (Serializer) _cachedSerializerMap.get(cl);
  
          if (serializer != null) {
              return serializer;
          }
  
          serializer = loadSerializer(cl);
  
          _cachedSerializerMap.put(cl, serializer);
  
          return serializer;
      }
docs: Returns the serializer for a class.
  
  @param cl the class of the object that needs to be serialized.
  @return a serializer object for the serialization.