See forum post for full description: http://ocpsoft.org/support/topic/command-not-fired-with-multipart-form-jsf-2-2/

I don't exactly know if this is a bug or not, but I wanted to raise the issue just in case. It seems like a "corner" case that could occur quite easily, and given that it requires a pretty nasty workaround (using undertow internals,) I figured it should probably be addressed.

Should DefaultServlet be aware of multipart requests?