edit: i think i misunderstoodd you. You want to trigger a scheduled action manually. I dont know that, sorry.
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You could place a scheduled job in your Alfresco Extensions directory. If you name the file custom-scheduled-jobs-context.xml and you copy the bean structure from scheduled-jobs-context.xm in it, it should work. I used the Records Management scheduled jobs as an example.
Well, i have a scheduled Action but i want (if necessary) run this action with a link. Eg: for evict to wait the time to next run… It's possible via WebScript or other???