How do I get the exception information that is caught in Spring DSL routes?

[Robert J. Liguori]

How do I get the exception information that is caught in Spring DSL
routes? 

For, example, when I'm using the validation component, the exception
routes the invalid XML to the specified endpoint:

            ...
           <doCatch>
               
<exception>org.apache.camel.ValidationException</exception>
                <to uri="mock:invalid"/>
            </doCatch>
            ...

That's cool, but I want to see what the exception was... how do I get
to it?  Note that I'm new to Spring and Camel.

Thanks,
Robert