Binding a DateField to a form

Vaadin 6 / 7 / 8 Framework Data Binding
1

Hi,
I bind a DateField to a form in this way:

DateField t=new DateField("Date");
t.setResolution(DateResolution.DAY);
Binder myBinder=new Binder<>(mioBean.getClass());
BindingBuilder builder=myBinder.forField(t)
		.withNullRepresentation("");
builder.bind(fieldName);

When I read the bean from database and send to the form with setBean(myBean), I get:

java.lang.String cannot be cast to java.time.temporal.Temporal

I also tryed adding

.withConverter(new StringToDateConverter())

with the same error. I couldn’t find any documentation about this. What is the right way to bind DateFields?
Thanks, Francesco

2

What is the type of the attribute you try to bind at builder.bind(fieldName)? Tried your example with a simple bean that has a attribute LocalDate date; and it worked well.

If the type of your attribute is String, change it to LocalDate, then it should work. The converter is not needed.

3

Hi,
thank you for your answer. The type is Date. In the database (postgresql) is mapped as timestamp.
Francesco

4

Which version of Vaadin do you use (in current version 8.3.3 a LocalDate is expected)?

5

Version 8.3.2

6

Hi,

LocalDate is different than Date. DateField value type is LocalDate. If your bean has a Date attribute you need to converter it.

For debugging, you can use getter and setter instead of fieldname:
Instead of builder.bind(fieldName); use builder.bind(MyBean::getDate, MyBean::setDate)

Then you should have a error in your IDE (you won’t need to run it)

7

All my beans have Date properties and not LocalDate. How can I bind them to DateField? Is there a Converter?

8

I think there is no converter for that (I’m not sure). You have to write it.

9

I tried but without success. Which type of converter do I need?

10

Does this LocalDateToDateConverter work?
Basically you have a DateField returns you a LocalDate, in the bean, you have a Date, so most likely you would need a LocalDateToDateConverter

11

For Date use LocalDate and LocalDateTime then you dont need any converter. If you get string from datebase then you need use converter.

binder.forField(fieldName).bind("propertyName")

12

I use DateField and LocalDate and no problem

DateField dateBorn = new DateField(bundle.getString("label.birthdate"));
		dateBorn.setDateFormat(browserLocale == Locale.forLanguageTag("en") ? "dd.MM.yyyy" : null);
		dateBorn.setRangeEnd(LocalDate.now());
		dateBorn.setValue(LocalDate.now());
		
binder.forField(dateBorn).asRequired().bind(Person::getDate, Person::setDate);