Canvas BufferedStrategy causes Error after adding contentPage to JFrame

[lethal trench]

So I was programming a bit on a Game Engine and have a JFrame and Canvas. Everything and all worked absolutely fine until I added a JPanel as Contentpage to my JFrame using setContentPage(JPanel).
I did this to use Keybindings in my JFrame because and now all of a Sudden my Canvas throws a "java.lang.IllegalStateException: Component must have a valid peer" Exception at the point where I try to use Canvas.createBufferStrategy.

I have no idea why and it only started after I added the setContentPage to my code. Google doesnt return an Answer as does SO.

[hearty osprey]

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[deep tiger]

You had Canvas as a component in frame (so on default contentpane). And you put another panel instead of the default. Right? If yes - that's the problem. Canvas can't exists out of nothing, I believe

[lethal trench]

Wait so the JPanel overwrites the Canvas?

[deep tiger]

it overwrites the panel that was set as default contentpane, if I understood you correctly

[lethal trench]

Do you have a different idea for how I can add Keybindings to my JFrame then?

[deep tiger]

KeyListener?
frame.addKeyListene(...)

[lethal trench]

Yes but Keylisteners have the problem of being way less functional than keybindings and also losing focus all the time

[deep tiger]

you might should create that panel and put in there the canvas

[hearty osprey]

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