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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-9302" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-7963296b-f3c5-4a79-9105-b6be11c06de7" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9302" style="color: #3b73af; text-decoration: none">HHH-9302</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-9302" style="color: #3b73af; text-decoration: none">SQLGrammarException with @DiscriminatorColumn in an inheritance hierarchy</a> </span>
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<p style="margin: 10px 0 0 0">We migrated .hbm.xml mappings to annotations (so we could use an annotation processor) and also encountered this issue in a hierarchy with subclasses having all their properties in <join table>s, similar to the following:</p>
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<class name=<span class="code-quote" style="color: #009100">"ParentXML"</span> table=<span class="code-quote" style="color: #009100">"parent_xml"</span> discriminator-value=<span class="code-quote" style="color: #009100">"PARENT"</span>>
<id name=<span class="code-quote" style="color: #009100">"id"</span> type=<span class="code-quote" style="color: #009100">"string"</span> length=<span class="code-quote" style="color: #009100">"36"</span>/>
<discriminator column=<span class="code-quote" style="color: #009100">"dtype"</span>/>
</class>
<subclass name=<span class="code-quote" style="color: #009100">"SubXML"</span> <span class="code-keyword" style="color: #000091">extends</span>=<span class="code-quote" style="color: #009100">"ParentXML"</span> discriminator-value=<span class="code-quote" style="color: #009100">"SUB"</span>>
<join table=<span class="code-quote" style="color: #009100">"sub_xml"</span>>
<key column=<span class="code-quote" style="color: #009100">"id"</span>/>
<!-- subclass properties -->
</join>
</subclass>
<subclass name=<span class="code-quote" style="color: #009100">"SubSubXML"</span> <span class="code-keyword" style="color: #000091">extends</span>=<span class="code-quote" style="color: #009100">"SubXML"</span> discriminator-value=<span class="code-quote" style="color: #009100">"SUB-SUB"</span>>
<join table=<span class="code-quote" style="color: #009100">"sub_sub_xml"</span>>
<key column=<span class="code-quote" style="color: #009100">"id"</span>/>
<!-- subclass properties -->
</join>
</subclass>
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<p style="margin: 10px 0 0 0">We changed it to a joined subclass hierarchy with discriminator and it resulted in the same schema being generated.</p>
<p style="margin: 10px 0 0 0">Using the session API and programmatically generated IDs we can persist but get the exception when querying subclasses with a subclass.(Another difference is that lazy-loaded associations to the parent class now return proxies of the parent class when they returned the real class before, but that is another issue)</p>
<p style="margin: 10px 0 0 0">The attached maven project contains both xml and annotated hierarchies and a test class that triggers the exception.</p>
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Change By:
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Attachment:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <span class="diffaddedchars" style="background-color:#ddfade;">hibernate-multi-level-joined-subclass-discriminator-xml.zip</span>
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