code: @Deprecated
      public <T> Exception onFallbackError(HystrixCommand<T> commandInstance, Exception e) {
          // pass-thru by default
          return e;
      }
docs: DEPRECATED: Change usages of this to {@link #onFallbackError}.
  
  Invoked after failed execution of {@link HystrixCommand#getFallback()} with thrown exception.
  
  @param commandInstance
  The executing HystrixCommand instance.
  @param e
  Exception thrown by {@link HystrixCommand#getFallback()}
  @return Exception that can be decorated, replaced or just returned as a pass-thru.
  
  @since 1.2