Has anyone run into the low-level error "java.lang.IllegalArgumentException at coldfusion.filter.FormScope.parseName"? We've seen this intermittently for a long time, on a small percentage of requests, all ajax. Ring any bells?

do you have underscores in your field names in this ajax routine?

Big app, built over years by many people. I imagine there are underscores in some fieldnames somewhere 🙂 Do you know of an issue with them?

i don't know if it's still a thing in recent cf versions, but as i recall specific naming conventions for form field names would flag cf to validate them, so (again, memory is hazy on specifics) a form field named "start_date" would cause cf to validate the value for a date, even when it was used outside of a cfinput. given that, i was just postulating that you may have field names that cf is choking on because it doesn't know 'what to do' with them. the specific error you're getting above made me think along these lines

Thanks for your thoughts, but I doubt it's that. As I said, these requests don't even get to CF, they blow up at the Java level before that. I see them in Fusion Reactor.