I got a similar problem when updated to macOS 10.15 Catalina. I went to System Preferences -> Security & Privacy -> Accessibility and here I deleted my application and then added it again. After this, all work perfectly.
For each window, use JComponent.registerKeyboardAction with a condition of WHEN_IN_FOCUSED_WINDOW. Alternatively use: JComponent.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(keyStroke, command); JComponent.getActionMap().put(command,action); as described in the registerKeyboardAction API docs.
Alright, this is kind of disappointing I’m sure, but you fundamentally cannot do this with 100% reliability. Windows assumes that the active window is the one getting keyboard input. The proper way to fake keyboard input is with SendInput, and you’ll notice that it sends messages to the active window only. That being said, you … Read more