it sort of depends on how you’re rendering, actually. If all you have is a JFrame rendering with a BufferStrategy from that JFrame, then the JFrame needs to be handling the events (and the JFrame is likely the only AWTEvent-capable container you’re using in that situation)
If your fullscreen frame is using a panel or some other container, it might not have focus (the fullscreen may have it). a few ways you can fix this:
- allow the fullscreen window to pass events to your container
or
- use the setFocusable(false) on your container, and do all event handling with the frame
but most important of all: post your code, so I can stop taking guesses at what the situation is