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All of us have come among situations when we have to parse user input for validation. Other fields such as text or numeric are rather easy, but Java date validation is little bit difficult and a small error can leave the application in unstable state.
1. Java Date Validation with SimpleDateFormat.parse() method
Usually, SimpleDateFormat.parse() method is used for validation. If parse()
method is able to parse the date, then it is considered that input is valid. Well, it might be incorrect. See below a use case.


1.1. What went wrong?
Above date validation is strange for two reasons. First, it should have flagged the validation error, and second the date object obtained is completely useless. So, what went wrong here.
Well, error is in parsing logic. parse(
) method uses positions of pattern keywords in DATE_PATTERN and uses it to parse input string. It is not intelligent by default to use the right characters for parsing and it uses what comes on its way (even slashes).
2. Correct way to validate date in Java – SimpleDateFormat.setLenient()
The solution is to use SimpleDateFormat.setLenient() method to bring the missing intelligence. Look at the strict date validation example given below:
Program output.
So, clearly setting setLenient(false); corrects the parsing behavior of SimpleDateFormat
.
3. Update – Default leniency behavior in date parsing
Source – http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Calendar.html
Calendar
class has two modes for interpreting the calendar fields, lenient and non-lenient. When a calendar is in lenient mode, it accepts a wider range of calendar field values than it produces. When a calendar recomputes field values for return by get()
, all of the calendar fields are normalized.
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For example, a lenient GregorianCalendar
interprets “MONTH = JANUARY and DAY_OF_MONTH = 32” as February 1, which is incorrect.
When a Calendar is in non-lenient mode, it throws an exception if there is any inconsistency in its calendar fields. For example, a GregorianCalendar
always produces DAY_OF_MONTH
values between 1 and the length of the month. A non-lenient GregorianCalendar
throws an exception upon calculating its time or calendar field values if any out-of-range field value has been set.
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Default is lenient mode.
In this Java date validation example, we learned how to convert string to a particular date format in Java. And fail for other date patterns.
Happy Learning !!
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Ref – SimpleDateFormat Java Doc
@oscarand: I like your tool. It's easy to use and serves its purpose well. Anyway, I found that it doesn't support some xpath expressions. Given this xml input: <root> <test><id>3000</id></test> <test><id>3000</id></test> <test><id>3000</id></test> <test><id>3002</id></test> <test><id>3002</id></test> <test><id>3005</id></test> </root> And the following xpath: (/root/test[id=3002]/id)[1] The tool doesn't return any result. (It should return '3002'). Do you plan to support this kind of xpath expressions in a future release? Thanks!
This would be a good tool, however, when validating xml against an xsd, I get a message: 'Error - The element cannot contain text. Content model is empty'. But it does not tell me anywhere what Node or Element has the error. I finally found which node by manually figuring it out. This tool should always show what node/element the error occurred on, but it doesn't. I forced other errors too, and many errors do not tell you what node the error occurred on. For example, add any attribute to an element, that isn't allowed in the xsd, and you get an error, but it does not tell you what Node/Element the error is in. Otherwise, this looks like it would be a good tool.
Limited to 64 KB
Bad handling. Limited to 64 KB. Cannot be used when XSD > 64 KB
Great app, precisely what I needed without the extra fat! Thanks