discardChannel 
  Specify a channel where rejected Messages should be sent. If the discard channel is null (the default), rejected Messages will be dropped. A "Rejected Message" means that split function has returned an empty result (but not null): no items to iterate for sending.
Parameters
discardChannel 
The discard channel.
Specify a channel bean name where rejected Messages should be sent. If the discard channel is null (the default), rejected Messages will be dropped. A "Rejected Message" means that split function has returned an empty result (but not null): no items to iterate for sending.
Parameters
discardChannelName  
The discard channel bean name.