Let's address the issue of including any Docker image while building data pipelines using Spring Cloud Data Flow, which can natively interpret only Spring Boot images.
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Look at containerizing a Spring Data Cassandra Application. More specifically, how to put a Spring application that connects to a Cassandra database into containers.
Want to learn more about messaging with RabbitMQ? Check out this tutorial on how to create a message producer with Spring Boot and the RabbitMQ in PCF.