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https://issues.apache.org/struts/browse/WW-2263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44217#action_44217
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Bob Tiernay commented on WW-2263:
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I agree that this is quite confusing and lead to a lot of message="".
Recommend making this this optional.
> validation annotation message attribute required even if using key attribute
> ----------------------------------------------------------------------------
>
> Key: WW-2263
> URL: https://issues.apache.org/struts/browse/WW-2263
> Project: Struts 2
> Issue Type: Bug
> Components: XML Validators
> Affects Versions: 2.0.9
> Environment: Debian Linux
> Reporter: chad michael davis
> Fix For: 2.1.3
>
>
> This "bug" is about a quirky interface to validations using annotations. In
> the XML, the message element can contain the text of the message in its body,
> or omit the body and use key attribute to name the key into the resource
> bundles for retrieving the message.
> Under annotations, the message attribute is always required. Seems like you
> should be able to specify a key and drop the message attribute but you can't.
> To specify a key you must use the key attribute ( note, key and message are
> sibling level attributes of the annotation itself; this is different from the
> xml ) such as follows:
> @EmailValidator(type = ValidatorType.FIELD, key="email.invalid",
> message="Email no good.")
> In this annotation, I still have a message specified, as a back up I guess.
> But if I try to remove it altogether, the equivalent of what i do in XML with
> the following:
> <field-validator type="requiredstring">
> <message key="username.required"/>
> </field-validator>
> Then it blows up. i guess this isn't a bug, but it seems kind of odd,
> forcing the user to specify a message text that won't be used ( a default
> message will be provided in the form of the key string itself if the
> properties file is missing, right? ), and its clearly inconsistent between
> the XML and the annotations
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