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.

The default behaviour of many Components is InOnly such as for JMS in EIP Component Reference, File or SEDA in EIP Component Reference

	Related
	See the related Request Reply message.

If you are using a component which defaults to InOut you can override the Exchange Pattern for an endpoint using the pattern property.

foo:bar?exchangePattern=InOnly

From 2.0 onwards on Camel you can specify the Exchange Pattern using the dsl.

Using the Fluent Builders

from("mq:someQueue").
  inOnly().
  bean(Foo.class);

or you can invoke an endpoint with an explicit pattern

from("mq:someQueue").
  inOnly("mq:anotherQueue");

Using the Spring XML Extensions

<route>
    <from uri="mq:someQueue"/>
    <inOnly uri="bean:foo"/>
</route>

<route>
    <from uri="mq:someQueue"/>
    <inOnly uri="mq:anotherQueue"/>
</route>