question: @ Override public void onFailure ( TaskCallback callback , Throwable t ) { try { state . doneProcess ( ) ; abort ( t ) ; TaskCallbackImpl callbackImpl = ( TaskCallbackImpl ) callback ; callbackManager . updateCallback ( callbackImpl , false ) ; log . error ( "Got callback failure for task {}" , callbackImpl . taskName ) ; } catch ( Throwable e ) { log . error ( e . getMessage ( ) , e ) ; } finally { resume ( ) ; } }
target:  Task process fails. Trigger the listener indicating failure.