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I am adding item in the combo box within a fucntion and I am calling that function from actionListener of a button.
The combo box is getting populated, I am able to print the value using SOP but it is not updating in GUI.
On line 43 you create a new instance of Leeloo which is completely unrelated to the current Leeloo instance. It has its own set of combo boxes and all. Try calling simply "getDataFiles", without the "l." This will call this method on your current instance.