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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: 10px 0 0; margin-top: 0">The unique-constraint is actually picked up by the annotation parser.</p> <p style="margin: 10px 0 0">The reason they're actually not pushed to the schema is because when the schema tooling asks the table for the unique-keys, the <tt>org.hibernate.mapping.Table#getUniqueKeys()</tt> method performs a data sanitize step that is based on the following rules:</p> <p style="margin: 10px 0 0"> its just that there is some sanitation logic for unique-key definitions that map to primary-keys. More specifically:</p>
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<span class="code-comment" style="color: #808080">// Rule 1
</span><span class="code-comment" style="color: #808080">// If there are multiple unique keys contained in the uniqueKeys Map, we need to deduplicate
</span><span class="code-comment" style="color: #808080">// any sharing the same columns as other defined unique keys; <span class="code-keyword" style="color: #000091; color: #808080">this</span> is needed <span class="code-keyword" style="color: #000091; color: #808080">for</span> the annotation
</span><span class="code-comment" style="color: #808080">// processor since it creates unique constraints automagically <span class="code-keyword" style="color: #000091; color: #808080">for</span> the user
</span><span class="code-comment" style="color: #808080">//
</span><span class="code-comment" style="color: #808080">// Rule 2
</span><span class="code-comment" style="color: #808080">// Remove any unique keys that share the same columns as the primary key; again, <span class="code-keyword" style="color: #000091; color: #808080">this</span> is
</span><span class="code-comment" style="color: #808080">// needed <span class="code-keyword" style="color: #000091; color: #808080">for</span> the annotation processor to handle @Id @OneToOne cases. In such cases the
</span><span class="code-comment" style="color: #808080">// unique key is unnecessary because a primary key is already unique by definition. We handle
</span><span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">this</span> <span class="code-keyword" style="color: #000091; color: #808080">case</span> specifically because some databases fail <span class="code-keyword" style="color: #000091; color: #808080">if</span> you <span class="code-keyword" style="color: #000091; color: #808080">try</span> to apply a unique key to
</span><span class="code-comment" style="color: #808080">// the primary key columns which causes schema export to fail in these cases.</span>
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</div> <p style="margin: 10px 0 0">In your specific case, the unique-key qualifies as Rule 2; thus it gets removed. In other words, working as intended.</p> </td>
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