TextField null representation and setting value programmatically

Hi all,

Using Vaadin v7.5.9, I have a textfield declared as follows:

TextField tf = new TextField();
tf.setNullRepresentation("");
tf.setNullSettingAllowed(true);
tf.setImmediate(true);
tf.addValueChangeListener( .. )

Now, if I programmatically set its value to the empty string...

tf.setValue("");

... and then retrieve its value in the ValueChangeListener...

String value = tf.getValue();

... the resulting value should be null, right? Or have i missed something?

Anyways, value turns out to be the empty string.

Is this a bug?

No - from javadoc of setNullRepresentation:

Textual representation for null strings.

Nothing about converting a null representaion to null value.

Javadoc of setNullSettingAllowed:

Sets the null conversion mode.

If this property is true, writing null-representation string to text field always sets the field value to real null.

Sou you need to call:

setNullSettingAllowed(true);

to get null for empty string.