I have a field of type java.util.GregorianCalendar<field name="tripDate" class="java.util.GregorianCalendar"/>[/code]I need to create a JSON datasource and pass this field. For String/Boolean and numbers all is ok, i can simply create the JSON datasource. But, how i can pass a GregorianCalendar from JSON to Jasper? In any cases, i got the error: Unable to get value for JSON field "tripDate" of class java.util.GregorianCalendarField "tripDate" is of class java.util.GregorianCalendar and can not be converted.[/code]