title: Spring Boot to Spring XD conversion
body: <p>I have an existing stand-alone Spring Boot (CommandLineRunner) application that generates JSON payloads, currently written to the local file system.  Though I could tail that file easily in Spring XD, I'd rather have the entire Spring Boot application run as either a source or job module in Spring XD, but I'm having some difficulties making the conversion.  Does anyone know of a Spring XD sample where the XD module (source or job) is the creator/originator of outgoing messages, instead of using some sort of inbound adapter from another external system?  (Maybe my entire premise is misguided, but I want the application to be managed by Spring XD so that I don't have to manage another out-of-band orchestration tool to start and stop the JSON-generating process.)</p>