The Style Masks constants [1], which are utilised by AWT, were deprecated starting from macOS 10.12 Sierra. It is high time to replace them with new constants introduced by NSWindowStyleMask enumeration [2].

[1] - https://developer.apple.com/documentation/appkit/nspanel/style_masks
[2] - https://developer.apple.com/documentation/appkit/nswindowstylemask