setting JMSXGroupId property from within a processor

[Kamal]

I am trying to set the JMXGroupId property from within a processor using the
following code.  
exchange.getOut().setHeader("JMSXGroupID",groupId);
which doesn't work.

I also tried to get hold of the underlying JMSMessage by casting the Message
object, but the underlying JMS message object is null. 
                Message outMessage = exchange.getOut();
                JmsMessage jmsOutMessage = (JmsMessage) outMessage;
                javax.jms.Message underlyingMessage = 
jmsOutMessage.getJmsMessage();
                System.out.println("underlyingMessage" + underlyingMessage);

The requirement is to extract information from the message and set it as a
JMSXGroupID.  We don't have control over the producer.  We are using
ActiveMQ, with Camel embedded within the broker.  

The following is my camel context configuration
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring";>
          <route>
                <from uri="activemq:testQ-input"/>
                <process ref="groupIdInsertionProcessor"/>
                <to uri="activemq:testQ-output"/>
          </route>
</camelContext>

<bean id="groupIdInsertionProcessor" class="xx.GroupIdInsertionProcessor"/>

public class GroupIdInsertionProcessor implements Processor {
        public void process(Exchange exchange) throws Exception {
                Message inMessage = exchange.getIn();
                exchange.getOut().setHeader("JMSXGroupID",inMessage.getBody());
        }
}


Thanks for the help.

Regards,
Kamal
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