Webflow and SnapshotNotFoundException

[arecibo]

Hi,

I sometimes get a SnapshotNotFoundException when using webflow:

Caused by: org.springframework.webflow.execution.repository.snapshot.SnapshotNotFoundException: No flow execution snapshot could be found with id ?; perhaps the snapshot has been removed?

I can also produce this error if I manually change the execution parameter in the webflow URL. How can I catch this exception? Ideally I would like to redirect my users to the start of the flow when this happens. I think I need to extend the class org.springframework.webflow.mvc.servlet.FlowHandlerAdapter and inject it into the FlowController but how can I do this in Grails?

Thanks in advance for any help!

Kenny