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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HV" style="color: #3b73af; text-decoration: none">Hibernate Validator</a> / <a href="https://hibernate.atlassian.net/browse/HV-1603" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-58ed0ce1-c0e8-4b75-9e66-751289883231" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HV-1603" style="color: #3b73af; text-decoration: none">HV-1603</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HV-1603" style="color: #3b73af; text-decoration: none">Optional.empty with @NotBlank on the type field fails validation</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-58ed0ce1-c0e8-4b75-9e66-751289883231" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 6.0.9.Final </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> validators </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 25/Apr/2018 10:15 AM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> mvn -v: <br> Apache Maven 3.5.2 (138edd61fd100ec658bfa2d307c43b76940a5d7d; 2017-10-18T00:58:13-07:00) <br> Maven home: C:\tools\apache-maven\bin\.. <br> Java version: 9.0.4, vendor: Oracle Corporation <br> Java home: C:\Program Files\Java\jdk-9.0.4 <br> Default locale: en_US, platform encoding: Cp1252 <br> OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows" </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> validation </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-minor-5e62494f-90e4-4e74-8a91-150c7f3fafb1" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="clockwork-muse" id="email_clockwork-muse" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=clockwork-muse" style="color:#6c797f;; color: #3b73af; text-decoration: none">Stephen Imhoff</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Supposing a type with the following definition:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">final</span> <span class="code-keyword" style="color: #000091">class </span>StringWrapper {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">final</span> Optional<@NotBlank <span class="code-object" style="color: #910091">String</span>> num;
<span class="code-keyword" style="color: #000091">public</span> StringWrapper(Optional<<span class="code-object" style="color: #910091">String</span>> num) {
<span class="code-keyword" style="color: #000091">this</span>.num = num;
}
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I would expect <tt>Optional.empty()</tt> to generate no validation errors, because the value is not present. Certainly that's the way other constraints work. Unfortunately, what I get instead is:</p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">'must not be blank'</p>
</blockquote> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It's pretty clear why this is happening:</p>
<div class="code panel" style="border-style: solid;border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;border-bottom-style: solid;; border-bottom: 1px solid #cccccc; padding: 9px 12px">
<b>OptionalValueExtractor.java</b>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Override
<span class="code-keyword" style="color: #000091">public</span> void extractValues(Optional<?> originalValue, ValueExtractor.ValueReceiver receiver) {
receiver.value( <span class="code-keyword" style="color: #000091">null</span>, originalValue.isPresent() ? originalValue.get() : <span class="code-keyword" style="color: #000091">null</span> );
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">...and since null isn't a valid value, it of course fails the validation. Any null-failing validator would complain at that point.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">A more idiomatic way to deal with optionals would be something like:</p>
<div class="code panel" style="border-style: solid;border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<b>OptionalValueExtractor.java</b>
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<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Override
<span class="code-keyword" style="color: #000091">public</span> void extractValues(Optional<?> originalValue, ValueExtractor.ValueReceiver receiver) {
originalValue.ifPresent( value -> receiver.value( <span class="code-keyword" style="color: #000091">null</span>, value ));
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">...which would only call the receiver if it was present. However, that's <b>only</b> if the value was present, which is a behavior change, so I'm unsure of all the ramifications of that.</p> </td>
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