[hibernate-issues] [Hibernate-JIRA] Commented: (HV-435) org.hibernate.validator.constraints.impl.PatternValidator rejecting empty strings
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http://opensource.atlassian.com/projects/hibernate/browse/HV-435?page=com...
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Gunnar Morling commented on HV-435:
-----------------------------------
I don't think that this change would be correct, as we would derive from what is
defined in the spec (it's only saying null is a valid value, but there is nothing said
about empty strings). I suggest that you modify your regular expression so that it excepts
empty strings OR the pattern you really intend. If you are working with JSF 2, you can
also have empty strings automatically being converted to null by specifying the following
context parameter in your web.xml (see [JSF 2 spec|http://jcp.org/en/jsr/detail?id=314],
section 11.1.3):
{code:xml}
<context-param>
<param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
<param-value>true</param-value>
</context-param>
{code}
org.hibernate.validator.constraints.impl.PatternValidator rejecting
empty strings
---------------------------------------------------------------------------------
Key: HV-435
URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-435
Project: Hibernate Validator
Issue Type: Bug
Components: validators
Affects Versions: 4.1.0.Final
Environment: Hibernate Core 3.5.6 with MySql database (not relevant to this bug)
Reporter: Stephen Hiley
Original Estimate: 1h
Remaining Estimate: 1h
The PatternValidator currently checks for a null value and returns true from isValid() in
that case. An empty string should have the same effect. This is necessary for the same
reason: to allow for an empty form submission (which commonly are submitted as empty
strings rather than nulls) and only validate when some value is submitted. IMO, this
should be standard behavior. If nothing else, provide an option to treat empty strings as
ignored in the same manner that null values are treated today.
Suggested modification:
public boolean isValid(String value, ConstraintValidatorContext
constraintValidatorContext) {
if ( value == null || value.length() == 0) {
return true;
}
Thanks,
Stephen Hiley
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