Customized Converter for String to Enum

Vaadin 6 / 7 / 8 Framework Data Binding
1

I wrote the Customized converter for String to Enum (for OptionalGroup field), when ever i tried to bind the values, convertToModel() and convertToPresentation() methods are getting called trice with values of null, which results in invalid data binding .

2

Converter should handle null values. convertToModel and convertToPresentation may receive null values.

3

Hi Johannes,

Thanks for the Comment, and in the above case
how to clear the OptionalGroup,
 the statements setValue(null) and selected(null) are not working as i have already dealt the null condition in Converter methods- convertToModel(), convertToPresentation(). Please guide me here.

4

Well null should be the value of cleared OptionGroup. How are you handling the null in Converter?