Catch Exception thrown by a SwingWorker located in a different class?

Keep a reference to your workers in your GUI and in your workes add a try catch. In the catch assign the exception to a variable and add a getter to it. IN your GUI, when your worker is done, just check if there is an exception in the worker or not.

An alternative (with slightly lower coupling) I'm nowadays playing with is to let the worker fire a propertyChange with the exception as newValue.

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