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int[] oldArray = {1,2,3};
Integer[] newArray = new Integer[oldArray.length];
int i = 0;
for (int value : oldArray) {
    newArray[i++] = Integer.valueOf(value);
}

// OR
Integer[] IntegerArray = ArrayUtils.toObject(intArray)

int[] intArray = new int[IntegerArray.length];
for (int i = 0; i < IntegerArray.length; i++) {
    intArray[i] = IntegerArray[i].intValue();
}

// OR
ArraysUtils.toPrimitive(IntegerArray);