An "outbound-channel-adapter" element can also connect a MessageChannel to any POJO consumer method that should be invoked with the payload of Messages sent to that channel.

<outbound-channel-adapter channel="channel1" ref="target1" method="method1"/>

If the channel being adapted is a PollableChannel, provide a poller sub-element:

<outbound-channel-adapter channel="channel2" ref="target2" method="method2">
    <poller>
        <interval-trigger interval="3000"/>
    </poller>
</outbound-channel-adapter>
<beans:bean id="target1" class="org.bar.Foo"/>

Using a "ref" attribute is generally recommended if the POJO consumer implementation can be reused in other <outbound-channel-adapter> definitions. However if the consumer implementation should be scoped to a single definition of the <outbound-channel-adapter>, you can define it as inner bean:

<outbound-channel-adapter channel="channel2" method="method2">
        <beans:bean class="org.bar.Foo"/>
    
</outbound-channel-adapter>

	Note
	Using both the "ref" attribute and an inner handler definition in the same <outbound-channel-adapter> configuration is not allowed, as it creates an ambiguous condition and will result in an Exception being thrown.

Any Channel Adapter can be created without a "channel" reference in which case it will implicitly create an instance of DirectChannel. The created channel's name will match the "id" attribute of the <inbound-channel-adapter/> or <outbound-channel-adapter element. Therefore, if the "channel" is not provided, the "id" is required.