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<p style="margin: 10px 0 0; margin-top: 0">Why doesn't the @NotNull constraint on a1 ever get enforced?</p>
</blockquote> <p style="margin: 10px 0 0">Is it really <em>never</em> or is it not validated only if the constraint on <tt>a2</tt> is violated? Validation of group sequences stops after the first erroneous group. So if your default group sequence is defined as <tt>Complete</tt>, <tt>A</tt>, validation will stop after <tt>Complete</tt> if <tt>a2</tt> is invalid.</p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0; margin-top: 0">I don't think there's any way to actually achieve what I want since there doesn't seem to be any way to invoke validation such that only the constraint on a1 is enforced</p>
</blockquote> <p style="margin: 10px 0 0">Your use case can be implemented using <a href="http://beanvalidation.org/1.1/spec/#constraintdeclarationvalidationprocess-groupsequence-groupinheritance" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">group inheritance</a>. Define two groups like so:</p>
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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">interface</span> Relaxed {}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> Complete <span class="code-keyword" style="color: #000091">extends</span> Relaxed, javax.validation.groups.Default {}
</pre>
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</div> <p style="margin: 10px 0 0">Redeclare the default group sequence for <tt>A</tt> so it as <tt>Complete</tt> as the first element:</p>
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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">
@GroupSequence({Complete.class, SuperUser.class})
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>A {
@NotNull(groups=Relaxed.class)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> a1;
@NotNull
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> a2;
}
</pre>
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</div> <p style="margin: 10px 0 0">Then when validating the default group (by passing no group at all or <tt>Default.class</tt> to the <tt>validate()</tt> call), it will validate the <tt>Complete</tt> group which comprises all the constraints from <tt>Default</tt> and <tt>Relaxed</tt>. When calling <tt>validate(new A(), Relaxed.class</tt>), it'll only validate the constraint on <tt>a1</tt>.</p> <p style="margin: 10px 0 0">Hope that helps - please let me know when we can close this issue. Thanks!</p> </td>
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