Port `Att.scala` to Java #4380

Job	Run time
Version Sync	11s
Nix flake (self-hosted, linux, normal)	4m 5s
Nix flake (macos-13, macos-13)	25m 17s
Nix flake (MacM1, self-macos-12)	4m 19s
Check code formatting	1m 10s
K Tests	56s
K Ubuntu Jammy Package	1m 49s
Performance Tests	0s
	37m 47s

Provide feedback