health_monitor | Monitor individual aspects of your rails | Application Framework library

Well, Spring Integration is a Messaging framework. It transfers messages from endpoint to endpoint via channels in between. That's already the target endpoint responsibility to deal with consumed message the proper way. The framework doesn't care about the payload. It is really a business part of the target application. That's how we can make framework components as generic as possible leaving the room for target business types for end-users.

Anyway the Framework provides some mechanisms to interact with payloads. We call it POJO method invocation. So, you provide some business with arbitrary contract, however following some Spring Integration rules: https://docs.spring.io/spring-integration/docs/current/reference/html/#service-activator.

So, according your description it is really a surprise that it doesn't work for healtcheckActivator.process(Healthcheck healthcheck). Your transform(Transformers.fromJson(Healthcheck.class)) should really produce a Message with Healthcheck object as a payload. The framework consults a method signature and tries to map a payload and/or headers to the method invocation arguments, having the whole message as a container for data to delegate to the method call.

From here it would be great to see your healtcheckActivator.process() method to determine why the transform(Transformers.fromJson(Healthcheck.class)) result cannon be mapped to that method arguments.