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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/BVAL" style="color: #3b73af; text-decoration: none">Bean Validation</a> / <a href="https://hibernate.atlassian.net/browse/BVAL-469" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/BVAL-469" style="color: #3b73af; text-decoration: none">BVAL-469</a>
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<td style="vertical-align: top;; padding: 0px; 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/BVAL-469" style="color: #3b73af; text-decoration: none">Clarify that nesting of message parameters within EL expressions is legal</a> </span>
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spec-general
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18/Nov/13 11:28 AM
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="gunnar.morling" id="email_gunnar.morling" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gunnar.morling" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gunnar Morling</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">While not explicitly stated, the <a href="http://beanvalidation.org/1.1/spec/#default-resolution-algorithm" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">algorithm for message interpolation</a> also covers the case of nesting message parameters within EL expressions, which allows for use cases which refer to messages from the resource parameters or constraint attributes (which are resolved via parameter interpolation) which then are used within EL expressions. The following gives an example:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@ThresholdMax(
value=10,
messageThreshold=50,
message=<span class="code-quote" style="color: #009100">"${validatedValue > {messageThreshold} ? '{muchTooLarge.message}' : '{aBitTooLarge.message}'}"</span>)
<span class="code-object" style="color: #910091">int</span> myInt = ...;
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This case should be resolved by the algorithm as follows:</p>
<ul>
<li>
After step 3 (resource bundle replacements): "$
<div class="error">
<span class="error">Unknown macro: {validatedValue > {messageThreshold} ? 'Viel zu groß' }</span>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">"</p>
</li>
<li>
After step 4 (resolution of constraint attributes): "$ {validatedValue > 50 ? 'Viel zu groß' : 'Zu groß'}
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">"</p>
</li>
<li>
After step 5 (EL evaluation): "Viel zu groß" or "Zu groß", depending on the threshold value
</li>
</ul>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">To clarify that such nesting is considered legal, an example as this should be added to the spec and a test to the TCK.</p>
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