iterablebatch.xml

<batch:job name="forceJob">
   <batch:input>
     <http:listener path="/forceWielders" config-ref="forceListener" />
     <ee:transform>
            <ee:message>
                <ee:set-payload><![CDATA[%dw 2.0
                  output application/java
                  ---
                 payload
                }]]></ee:set-payload>
            </ee:message>
     </ee:transform>
   <batch:input>
   .....
</batch:job>