Problem when clearing selected items programatically

[mlopezFC]

According to a comment in the discussions in the addon's Vaadin directory page:

Is there a way to clear the selected items programmatically. I tried with twinColGrid.setValue(null) which throws exception. Tried with twinColGrid.clear() which doesn't throw any exception, but doesn't clear the elements. I've also tried with twinColGrid.setValue(new HashSet<>()) which again, throws no exception, but doesn't clear

[javier-godoy]

The "value" of a TwinColGrid is the set of right-selected items, thus setValue isn't expected to modify the lists in any way. In order to clear the lists one has to call setItems(Collections.emptyList()))

setValue(null) indeeds throws an exception., which seems to be the correct behavior since getItems() returns an empty set when no items are selected.

On the other hand clear() DOES throw an exception (as of 2.0.4-SNAPSHOT) because it's implemented as setValue(getEmptyValue()) and getEmptyValue() returns null.