Question

who were the Kalangs what was their field of expertise

Answer 1

heya your answer!!
Kalangas were the skilled community of the
woodcutters and shifting cultivators.
the were considered valuable due to their skills that were required to harvest team and engage in their other construction activities.

their value can be gauged from the fact that when the Mataram Kingdom of Java spilt in 1755.
the 6000 kalang families were equally divided between the kingdoms.