I'm developing an application over the Netbeans API and I need to show a `JFrame` object. I have already designed this frame in an independent Swing application and it seems to work fine but when I want to import it in my Netbeans application and show it. It just does nothing.
As far as I know, the code to show a frame is simply:
I have also tried to create a new frame straight from Netbeans to see how it reacts with a simple frame. It lead to the same issue.
Does the Netbeans API have some other requirements to show a `JFrame`?
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