Java – how to display a temporary balloon tooltip during input validation?

I'm a little used to Gui idioms. When I input an error in the text input field, a balloon pops up from the field, with information about what error / expected input I have It remains visible until I type it again

Given a jtextfield, do you know any library / code that will display such a balloon when my keylistener is triggered?

@see http://www.javapractices.com/topic/TopicAction.do?Id=151

Solution

Balloon tip is a library:

balloonTip = new BalloonTip(f,"Tooltip msg");

All this is needed! If you insist on a tooltip:

tooltipBalloon = new BalloonTip(someComponent,"I'm a balloon tooltip!");
// Now convert this balloon tip to a tooltip,such that the tooltip shows up after 500 milliseconds and stays visible for 3000 milliseconds
ToolTipUtils.balloonToToolTip(tooltipBalloon,500,3000);