title: Spring integration ending the flow
body: <p>I am working on a spring integration project, currently we are using return null to end the flow in some instances. Generally return null is not a good practice, I am looking for an alternate. I tried with throwing exception for stopping the flow which i believed better than returning null. But in some cases there are two flows from single publish-subscribe-channel, in those cases throwing exception stops both the flow.Is there any better way to stop the flow in SI?  </p>