Primefaces Calendar Setting Date Value in Backing Bean

问题

I am using Primefaces inline (no popup) calendar on my JSF page. When the page is initially loaded, the calendar shows today's date. Initially the backing bean's value attached to calendar's date is empty. Now when I submit the form without selecting a date (no mouse select), the today's date value is not being set in backing bean. Isn't this a bug? Why am I forced to select a date when the date is already highlighted on a calendar when page is loaded?

Primefaces 3.4.2, JSF 2.2, Glassfish 4

<h:form id="calendarFormId">
        <p:calendar id="calendarId" mode="inline" value="#{eventController.eventUI.date}" widgetVar="calendarWidget">
        </p:calendar>
</h:form>

来源：https://stackoverflow.com/questions/17737414/primefaces-calendar-setting-date-value-in-backing-bean