<style>
/* Changing the layout to use less space for mobiles */
@media screen and (max-device-width: 480px), screen and (-webkit-min-device-pixel-ratio: 2) {
#email-body { min-width: 30em !important; }
#email-page { padding: 8px !important; }
#email-banner { padding: 8px 8px 0 8px !important; }
#email-avatar { margin: 1px 8px 8px 0 !important; padding: 0 !important; }
#email-fields { padding: 0 8px 8px 8px !important; }
#email-gutter { width: 0 !important; }
}
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<img id="email-avatar" src="https://secure.gravatar.com/avatar/953ecae5408035dc5fd8692e943e5c63?d=mm&s=48" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
<div id="email-action" style="padding: 0 0 8px 0;font-size:12px;line-height:18px;">
<a class="user-hover" rel="stefanfromm" id="email_stefanfromm" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=stefanfromm" style="color:#6c797f;">Stefan Fromm</a>
created <img src="https://hibernate.atlassian.net/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.atlassian.net/browse/HHH-8208'>HHH-8208</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.atlassian.net/browse/HHH-8208'><strong>DuplicateMappingException with multiple subclasses in one mapping file</strong></a>
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<td id="email-gutter" style="width:64px;white-space:nowrap;"></td>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<img src="https://hibernate.atlassian.net/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
4.2.1, 3.6.10 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned
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<strong style="font-weight:normal;color:#505050;">Attachments:</strong>
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hibernate-extendsqueue-test.zip </td>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
core </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
28/Apr/13 11:55 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>On building a session factory the <tt>HbmBinder.bindRoot()</tt> delays subclass entity mapping creation, if one the referenced superclasses has not been loaded, yet.</p>
<p style='margin-top:0;margin-bottom:10px;'>If one mapping file contains mappings for multiple subclasses, which reference still not loaded superclasses, then there occurs a bug because of the way the queuing works for delayed loading. For each missing superclass there is created one queue entry containing ALL the entities of the mapping file.</p>
<p style='margin-top:0;margin-bottom:10px;'>Consider the following example:</p>
<div class="panel" style="border-width: 1px;"><div class="panelHeader" style="border-bottom-width: 1px;"><b>Subclasses.hbm.xml</b></div><div class="panelContent">
<div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
<pre>hibernate-mapping>
<hibernate-mapping>
<subclass name="de.di.hibernate.tests.Subclass1" extends="de.di.hibernate.tests.RootClass1">
<property name="age" />
</subclass>
<subclass name="de.di.hibernate.tests.Subclass2" extends="de.di.hibernate.tests.RootClass2">
<property name="age" />
</subclass>
</hibernate-mapping>
</pre>
</div></div>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>There are referenced two superclasses <tt>RootClass1</tt> and <tt>RootClass2</tt>. If they both are not loaded yet the created queue entries are:</p>
<div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
<pre>RootClass1 -> [Subclass1, Subclass2]
RootClass2 -> [Subclass1, Subclass2]
</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>Later on, when the queued entries are iterated through, the subclasses are going to be mapped twice. This leads to a <tt>DuplicateMappingException</tt>.</p>
<p style='margin-top:0;margin-bottom:10px;'>Workaround 1: define mapping files which contain at most one subclass mapping.</p>
<p style='margin-top:0;margin-bottom:10px;'>Workaround 2: assure that superclass mappings are always loaded before subclass mappings.</p>
<p style='margin-top:0;margin-bottom:10px;'>I think this a bug, as generally it is allowed to define more than one subclass mapping per mapping file. The order in which mapping files are loaded is free, as the <tt>HbmBinder</tt> contains a treatment for this case (as mentioned in this bug ticket).</p>
<p style='margin-top:0;margin-bottom:10px;'>Test case attached.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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JDK 1.6
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
</td>
<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a style="color:#6c797f;" href="https://hibernate.atlassian.net/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.atlassian.net/images/icons/priorities/major.png" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="stefanfromm" id="email_stefanfromm" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=stefanfromm" style="color:#6c797f;">Stefan Fromm</a>
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