catch Exception thrown by ScheduledPollConsumer

[Martin Samuelsson]

Scenario: We have built a custom samba-component backed by jcifs that
extends GenericFileComponent. The Consumer extends GenericFileConsumer,
meaning it's also a ScheduledPollConsumer. The Consumer is in this case
using a custom Strategy that extends DefaultPollingConsumerPollStrategy. The
Strategy's rollback-method will under some circumstances throw an Exception
(e.g. when the share is unavailable or the provided credentials are
incorrect)

The RouteBuilder's configure-method looks something like this:

public void configure() {
    //...
    errorHandler(loggingErrorHandler("Handling FAILED"));

    onException(Exception.class)
            .log(LoggingLevel.INFO, "Caught an exception.");

     from("ourCustomerEndpointUri")
                .log(LoggingLevel.INFO, "Processing ${file:name}...")
                .to("anotherCustomEndpointUri");
    //...
}

Question: How can we handle this Exception?  We need a way to "catch" this
Exception and invoke another route (at this time to produce some custom
logging). The above code doesn't produce anything in the log. I believe this
have something to do with the Exception being thrown before the Exchange is
created.

Thanks in advance,

Martin