Example code in the scrolling document might not consume every element in the database.

[r6hk]

The example code in the document:

Window<User> users = repository.findFirst10ByLastnameOrderByFirstname("Doe", ScrollPosition.offset());
do {

  for (User u : users) {
    // consume the user
  }

  // obtain the next Scroll
  users = repository.findFirst10ByLastnameOrderByFirstname("Doe", users.positionAt(users.size() - 1));
} while (!users.isEmpty() && users.hasNext());

The execution result is as follows (there are slight differences from the code in the documentation, but it illustrates the point):

It can be observed that the elements with indices 10 through 14 have not been consumed.

Modified code:

ScrollPosition position = ScrollPosition.offset();
while (true) {
    users = repository.findFirst10ByLastnameOrderByFirstname("Doe", position);
    if (users.isEmpty()) break;
    for (User u : users) {
        // consume the user
    }
    if (!users.hasNext()) break;
    position = users.positionAt(users.size() - 1);
}

This code accounts for more cases, such as when the count of data is 0 or an exact multiple of 10.

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