Say I have the following simple java bean:
class MyBean {
private Date startDate;
private Date endDate;
//setter, getters etc...
}
Is there a mechanism in JSR 303 to create a custom validator that validates the constraint that startDate must be before endDate?
It seems to me to be a common use case, yet I cannot find any examples of this kind of multiple property relationsship constraint.
If you're using Hibernate Validator in version 4.1 or later you can use the @ScriptAssert constraint together with a scripting or expression language to express this kind of constraint. Using JavaScript your example would look like this:
@ScriptAssert(lang = "javascript", script = "_this.startDate.before(_this.endDate)")
public class CalendarEvent {
private Date startDate;
private Date endDate;
//...
}
You can get an even more compact syntax by creating a custom constraint for the script language of your choice:
@JexlAssert("_.startDate < _.endDate")
public class CalendarEvent {
private Date startDate;
private Date endDate;
//...
}