Adding Functionality to Apache NiFi
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Deprecating a Component

Sometimes it may be desirable to deprecate a component. Whenever this occurs the developer may use the @DeprecationNotice annotation to indicate that a component has been deprecated, allowing the developer to describe a reason for the deprecation and suggest alternative components. An example of how to do this can be found below:

          @DeprecationNotice(alternatives = {ListenSyslog.class}, classNames = {"org.apache.nifi.processors.standard.ListenRELP"}, reason = "Technology has been superseded",  )
 public class ListenOldProtocol extends AbstractProcessor {

As you can see, the alternatives can be used to define and array of alternative Components, while classNames can be used to represent the similar content through an array of strings.