CAS double submit issue?

[Yan Zhou]

Hi,

I noticed this in CAS4.x and CAS5.x.  CAS is built on Spring Webflow, it should automatically prevent double submission, but on my CAS overlay, it does not.

After form submits (such as Login, Password Reset), if the action takes longer to complete, and user clicks again before the Post is completed, I see the 2nd call coming in while the first is still being executed. 

What am I missing?  How would CAS (or Spring Webflow) prevent double-submit out of box?

P.S., this is not about the browser refresh, which happens when form is submitted for the 2nd time  _AFTER_ the 1st POST completes.  Mine is about clicking the submit button very fast, you generate multiple execution into the same action, when it should only be one. 

Thx!

Yan