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<p style="margin: 10px 0 0 0">I'm experiencing ENFE with merge() in similar situation and noticed that <a href="https://github.com/hibernate/hibernate-orm/commit/c3819b499f6f9fd528bfd1aab05c60fddd99b1a7" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/hibernate/hibernate-orm/commit/c3819b499f6f9fd528bfd1aab05c60fddd99b1a7</a> was applied instead of <a href="https://github.com/zroubalik/hibernate-orm/commit/537822c9d0f0a9ca5b85903f8f80074c0de6d03f" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/zroubalik/hibernate-orm/commit/537822c9d0f0a9ca5b85903f8f80074c0de6d03f</a> that would have dealt with this problem as well. </p>
<p style="margin: 10px 0 0 0">My problem arises through merge() operation that utilizes <tt>session.get()</tt> at <tt>DefaultMergeEventListener.entityIsDetached()</tt> which in turn is aware only of <tt>ObjectNotFoundException</tt> and not ENFE (as it should). This happens mainly because instance with assigned id was assumed to be detached and ENFE was not catched. The comment lines below state the situation as well (persistent should be transient in the last sentence, I presume).</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">//TODO: we should <span class="code-keyword" style="color: #000091; color: #808080">throw</span> an exception <span class="code-keyword" style="color: #000091; color: #808080">if</span> we really *know* <span class="code-keyword" style="color: #000091; color: #808080">for</span> sure
</span><span class="code-comment" style="color: #808080">// that <span class="code-keyword" style="color: #000091; color: #808080">this</span> is a detached instance, rather than just assuming
</span><span class="code-comment" style="color: #808080">//<span class="code-keyword" style="color: #000091; color: #808080">throw</span> <span class="code-keyword" style="color: #000091; color: #808080">new</span> StaleObjectStateException(entityName, id);
</span>
<span class="code-comment" style="color: #808080">// we got here because we assumed that an instance
</span><span class="code-comment" style="color: #808080">// with an assigned id was detached, when it was
</span><span class="code-comment" style="color: #808080">// really persistent
</span>entityIsTransient( event, copyCache );
</pre>
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