XMLItem - avoid Arrays.asList

[rsoika]

We should avoid Arrays.asList in XMLItem.

The static method Arrays.asList returns an instance of java.util.Arrays$ArrayList which is a nested class inside the Arrays class that implements the List interface. This particular implementation has a fixed size. And this can lead to a problem if the value is later converted back into an ItemCollecton!

The solution is to use instead the constructor to create the list:

new ArrayList<>(Arrays.asList(....));