What is the ruling on the court case of Spencer v Commonwealth of Australia?

In the case of Spencer v Commonwealth of Australia (2010), the High Court of Australia ruled on the validity of the Commonwealth's acquisition of land under the Constitution. The court concluded that the Commonwealth did not have the power to acquire land without just compensation, as mandated by Section 51(xxxi) of the Constitution. The decision emphasized the requirement for just compensation when property is acquired by the government, reinforcing property rights against government actions.