When a JSF validator finds an error, the form is returned to the user so he or she can correct it.

当JSF验证器发现一个错误时，将向用户返回此表单，以便改正。

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org.apache.derby.demo.validators — The ForwardDates is a custom JSF validator class, which ensures the date a flight is booked is either today or a future date.

validators —— ForwardDates 是定制 JSF 验证器类，确保预订的航班日期是今天或未来日期。

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