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Welcome to the validators wiki!

Validators is a Java library for Bean validation covering common validation scenarios without the baggage of additional third-party dependencies.

Components

1) DateTime Constraint

Use the @DateTime constraint to validate that a sequence of characters matches at least one of the date patterns provided.

class TestBean {
    @DateTime(patterns = "yyyy-MM-dd", message = "Invalid ISO date")
    String isoDate;

    public Date getIsoDate() {
        try {
            return new SimpleDateFormat("yyyy-MM-dd").parse(isoDate);
        } catch (ParseException e) {
            // Exception will not occur if the bean instance has been validated successfully.
        }
        return null;
    }
}

2) Expression Constraint

The @Expression constraint should be used in scenarios where either multiple fields must be considered or where slightly more complicated logic is necessary to check for an individual field's validity.