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Ahh, didn't look through it that closely ::blush::
dlorde's right, there is a flaw in your merge method. Do what he says and see if you can figure out what it is :)

Your MergeSort method never returns the sorted list.


public static int[] mergeSort(int[] data) {
if (data.length > 1) {

int mid = data.length / 2;

...