I had a very ‘uncomfortable’ issue with Idea when using it for ant builds – it hang in certain places like jar update task, rename task or similar.

All my struggle can be found on Idea track. Fortunately Carl Abramsson found a workaround for that issue using

-noinput

switch to ant launch. Now everything works like a charm. Decided to create this post in case some one will be desperately googling for a solution in the wrong place 🙂