Deep copy of an object array

I want to make a deep copy of an object array using a constructor.

public class PositionList {
    private Position[] data = new Position[0];

public PositionList(PositionList other, boolean deepCopy) {
        if (deepCopy){
            size=other.getSize();
            data=new Position[other.data.length];
            for (int i=0;i<data.length;i++){
            data[i]=other.data[i];
            }

However, what I have above for some reason is not working. I have automated tests that I run, and its failing those tests. So theres an error an here that Im not sure what it is.