JDBC Sqlite rs.next - don't go in rs.next-loop when PreparedStatement has a variable

It is really freaking me out. In my code I hand over a generated uuid as my private Key. Now I want to select from a table with only one value inside (avg_distance_as). Everything works fine when I write the statement with a fix uuid. But because I want to get the specific row with my current uuid, I want to put that in my statement too.

soooo no error nothing - he does not even call the syso in the rs.next loop. This one is working:

    public int getavgDistanceAs(String uuid) {

    try {
        Class.forName("org.sqlite.JDBC");
        con = DriverManager.getConnection("jdbc:sqlite:test.db");


        statement = con.prepareStatement("Select avg_distance_as, UUID from avg_distance");
        System.out.println(uuid);
        statement.setString(1, uuid);

        ResultSet rs = statement.executeQuery();

        while (rs.next()) {
            System.out.println(rs.getDouble(1));
            System.out.println("test");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            statement.close();
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return 0;
}

But this one isn't and it looks PRETTY much the same:

            statement = con.prepareStatement("Select avg_distance_as, UUID from avg_distance where UUID = ?");
        statement.setString(1, uuid);

Would be awesome if someone could help :)