Camel supports the Event Message from the EIP patterns by supporting the Exchange Pattern on a Message which can be set to InOnly to indicate a oneway event message. Camel Components then implement this pattern using the underlying transport or protocols.
See the related Request Reply message.
Explicitly specifying InOnly
If you are using a component which defaults to InOut you can override the Exchange Pattern for an endpoint using the pattern property.
From 2.0 onwards on Camel you can specify the Exchange Pattern using the DSL.
Using the Fluent Builders
or you can invoke an endpoint with an explicit pattern
Using the Spring XML Extensions