Why does Java 8's split not produce the last token

I would expect the following Java code to split a string into three items:

    String csv = "1,2,";

    String[] tokens = csv.split(",");

    System.out.println(tokens.length);

However, I am only getting two items.

I must admit that I did not analyze this very deeply, but it seems counter-intuitive to me. Both Python and C# generate three items, as follows, in Python:

def test_split(self):

    line = '1,2,'

    tokens = line.split(",")

    for token in tokens:

        print('-' + token)

-1

-2

-

and in C#:

   [Test]

    public void t()

    {

        string s = "1,2,";

        var tokens = s.Split(',');

        foreach (var token in tokens)

        {

            Console.WriteLine("-" + token);

        }

    }

-1

-2

-

What am I missing?

This is Java 1.8.0_101.