When writing custom message composers, one tends to extend it from the composer that is based on the underlying component. This creates a dependency on the switchyard-component-common component. Here are the thoughts as expressed by Keith:

1) Should users depend on component-common classes when writing custom message composers?
2) Is extending the component's message composer the right approach?
3) Why is the common message composer not picked up transitively from the resteasy component?

https://github.com/jboss-switchyard/quickstarts/pull/205