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Errors in multicast are not propagated to the dead letter chanel


I have a route that uses multicast parallel processing to process messages
in parallel. It works great, when everything is good. However if an
exception happens in any of the multicasted routes, the exception is
handled by the multicast but never written to the route's dead letter
channel. I am using the "shareUnitOfWork" and "stopOnException" but they
don't seem to help.

I discovered this while working on a unit test. Here is the unit test route:

from(errorMultiDirect).routeId("errorMulticastTest")
.errorHandler(deadLetterChannel(mock)
              .onPrepareFailure(errorProcessor).maximumRedeliveries(0))
.log(LoggingLevel.INFO, "Testing Error route")
.setHeader(OrderMessageConstants.WIMS_MSG_TYPE, simple("body[messageType]"))
.setHeader(OrderMessageConstants.SAP_MESSAGE_ID, simple("body[messageID]"))
.setHeader(OrderMessageConstants.ORDER_NUMBER,
simple("body[orderHeader][order]"))
.multicast().parallelProcessing().shareUnitOfWork().stopOnException().to("direct:materialsTest",
"direct:qmDocTest", "direct:sdsTest").end()
.to("log:com.sial.NotifyStatusLogger?level=INFO");

The test sends a message that causes "direct:materialsTest" to throw a null
pointer exception.

I can send the same message to this route which does not use multicast and
the error is propagated to the dead letter chanel.

from(errorDirect).routeId("errorMaterialTest")
.errorHandler(deadLetterChannel(mock)
              .onPrepareFailure(errorProcessor).maximumRedeliveries(0))
.log(LoggingLevel.INFO, "Testing Error route")
.setHeader(OrderMessageConstants.WIMS_MSG_TYPE, simple("body[messageType]"))
.setHeader(OrderMessageConstants.SAP_MESSAGE_ID, simple("body[messageID]"))
.setHeader(OrderMessageConstants.ORDER_NUMBER,
simple("body[orderHeader][order]"))
.bean(materialsEnrichment)
.to("log:com.sial.NotifyStatusLogger?level=INFO");

I am using Apache-camel 2.18.2
I will have to remove the multicast if it won't propagate the exception to
the Dead letter chanel

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