How to force rollback in spring DSL route?

[dunnlow]

Hi, I have a transacted route in Spring DSL that calls a service (via HTTP
post).  I want to examine the response from that service and force a
rollback depending on the returned value.  Basically something like:

<route>
   <from uri="jpa:com.MyBean"/>
   <transacted/>
   <setHeader
headerName="CamelHttpMethod"><constant>POST</constant></setHeader>
   <setHeader headerName="charset"><constant>utf-8</constant></setHeader>
   <setHeader
headerName="CONTENT_TYPE"><constant>test/xml</constant></setHeader>
   <to uri="http4://196.12.34.54:2020"/>
   <choice>
       <when>
          <simple>${header.CamelHttpResponseCode} != 202</simple>
          *(( Roll Back the Transaction ))*
          </simple>
       </when>
   </choice>
</route>

What is the right way to force a rollback?

Thanks for any insight,
-J


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