code: @Override
    public <T> T find(Class<T> clazz, Object id) {
      if (null == clazz) {
        throw new IllegalArgumentException("clazz cannot be null");
      }
      if (null == id) {
        throw new IllegalArgumentException("id cannot be null");
      }
  
      CFMappingDef<T> cfMapDef = cacheMgr.getCfMapDef(clazz, false);
      if (null == cfMapDef) {
        throw new HectorObjectMapperException("No class annotated with @"
            + Entity.class.getSimpleName() + " for type, " + clazz.getName());
      }
  
      return objMapper.getObject(keyspace, cfMapDef.getEffectiveColFamName(), id);
    }
docs: Load an entity instance. If the ID does not map to a persisted entity, then
  null is returned.
  
  @param <T>   The type of entity to load for compile time type checking
  @param clazz The type of entity to load for runtime instance creation
  @param id    ID of the instance to load
  @return instance of Entity or null if can't be found