How to capture error code while calling rest service through cxfrs client ?

Issue

• User need some help regarding how to capture error codes while calling rest web services using cxfrs client.
• Below is the route user is using to do so in blueprint. User can see the control navigated to doCatch block, user is unable to find the exact error code in the route or inside handler bean.
• Everytime Error code is printed on the log as Payload though.
• User need to check some business conditions based on these error codes.

<to uri="bean:myServiceCaller" />
<doTry>
                <loadBalance>
                                <failover />
                                <to uri="cxfrs:bean:myService" />
                                <to uri="cxfrs:bean:myService" />
                                <to uri="cxfrs:bean:myService" />
                </loadBalance>
                <log message="myservice is called Successfully" />
                <to uri="bean:mySeriviceProcessor" />
                <doCatch>
                                <exception>java.lang.Exception</exception>
                                <log message="..... BODY .....${body}" />
                                <log message="..... exception.message .....${exception.message}" />
                                <to uri="bean:myServiceHandler" />
                </doCatch>
</doTry>

• This is how user is throwing error codes on the rest provider side.

throw new WebApplicationException(Response.status(Response.Status.INTERNAL_SERVER_ERROR)
        .entity("ERROR001").type(MediaType.TEXT_PLAIN).build());