我已将Netbeans设置为在Java代码中显示未经检查的警告，但我无法理解以下行中的错误：

private List<String> cocNumbers;
private List<String> vatNumbers;
private List<String> ibans;
private List<String> banks;
List<List<String>> combinations = Utils.createCombinations(cocNumbers, vatNumbers, ibans);

提供：

[unchecked] unchecked generic array creation for varargs parameter of type List<String>[]

方法来源：

/**
 * Returns a list of all possible combinations of the entered array of lists.
 * Example: [["A", "B"], ["0", "1", "2"]]
 * Returns: [["A", "0"], ["A", "1"], ["A", "2"], ["B", "0"], ["B", "1"], ["B", "2"]]
 * @param <T> The type parameter
 * @param elements An array of lists
 * @return All possible combinations of the entered lists
public static <T> List<List<T>> createCombinations(List<T>... elements) {
    List<List<T>> returnLists = new ArrayList<>();
    int[] indices = new int[elements.length];
    for (int i = 0; i < indices.length; i++) {
        indices[i] = 0;
    returnLists.add(generateCombination(indices, elements));
    while (returnLists.size() < countCombinations(elements)) {
        gotoNextIndex(indices, elements);
        returnLists.add(generateCombination(indices, elements));
    return returnLists;
}

到底哪里出了问题，我该如何修复它，因为我认为在代码中留下未经检查的警告不是一个好主意？

忘了提一下，我使用的是Java7。

编辑 ：我现在还看到该方法有以下几点：

[unchecked] Possible heap pollution from parameterized vararg type List<T>
  where T is a type-variable:
    T extends Object declared in method <T>createCombinations(List<T>...)