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<p style="margin: 10px 0 0 0; margin-top: 0">In this case @NotBlank constraint handles null as a value but @Length constraint doesn't so if the order of their execution is random sometimes you can get the NullPointerException</p>
</blockquote> <p style="margin: 10px 0 0 0">There should be no <tt>NullPointerException</tt> one way of the other. As you say, constraint validators might treat <tt>null</tt> values differently, but they should never throw an exception. Most validators treat a <tt>null</tt> value as valid, and rely on constraint composition and for example the existence of an additional <tt>@NotNull</tt>. <tt>@NotBlank</tt> is a bit different, since it explicitly checks for the <tt>null</tt> value: "Validate that the annotated string is not null or empty."</p> <p style="margin: 10px 0 0 0">Do you have a case where a combination of built-in constraints throw a <tt>NullPointerException</tt>? I would consider this a bug.</p>
<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0 0; margin-top: 0">This can be fixed simpler than <a href="https://hibernate.atlassian.net/browse/HV-706" title="Offer ability to order constraint defined on single property" class="issue-link" data-issue-key="HV-706" style="color: #3b73af; text-decoration: none">HV-706</a>, generally speaking Option1 is not going to resolve this issue because of the eliminated groups parameter of the composing annotation.</p>
</blockquote> <p style="margin: 10px 0 0 0">Personally I prefer option 2</p>
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<p style="margin: 10px 0 0 0; margin-top: 0">I suggest to extend the @ConstraintComposition with an order parameter, so it could be:</p>
</blockquote> <p style="margin: 10px 0 0 0">I would prefer if a solution for <a href="https://hibernate.atlassian.net/browse/HV-706" title="Offer ability to order constraint defined on single property" class="issue-link" data-issue-key="HV-706" style="color: #3b73af; text-decoration: none">HV-706</a> also applies for constraint composition, instead of introducing yet another annotation/concept.</p> </td>
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