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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/OGM" style="color: #3b73af; text-decoration: none">Hibernate OGM</a> / <a href="https://hibernate.atlassian.net/browse/OGM-1294" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-15fb337f-45b6-451b-8f2a-0f1107e2f1c5" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/OGM-1294" style="color: #3b73af; text-decoration: none">OGM-1294</a> </td>
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<td style="vertical-align: top;; padding: 0; 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/OGM-1294" style="color: #3b73af; text-decoration: none">Properties of a subclass in a SINGLE_TABLE inheritance hierarchy are not loaded</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-15fb337f-45b6-451b-8f2a-0f1107e2f1c5" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.1.0.Final </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> mongodb </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 11/Jul/2017 23:15 PM </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-4c270223-5e56-49d1-99d8-0841d95029e3" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="dadrus" id="email_dadrus" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=dadrus" style="color:#6c797f;; color: #3b73af; text-decoration: none">Dimitrij Drus</a> </td>
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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-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">In a entity hierarchy using SINGLE_TABLE inheritance type, the properties of subclasses (which do not exist in the parent class) are not loaded if the query to retrieve the required objects acts on a parent class. It looks like the selector, created by Hibernate OGM for MongoDB extension, considers properties of a base class only. This works without any issue with any JPA provider for RDBMS databases.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">E.g.</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// Some comments here
</span>@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = <span class="code-quote" style="color: #009100">"TYPE"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">abstract</span> <span class="code-keyword" style="color: #000091">class </span>BaseClass {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> baseClassProperty;
}
@Entity
@DiscriminatorValue(value = <span class="code-quote" style="color: #009100">"A"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>SubClassA <span class="code-keyword" style="color: #000091">extends</span> BaseClass {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> subClassAProperty;
<span class="code-comment" style="color: #808080">// further properties and methods ...
</span>}
@Entity
@DiscriminatorValue(value = <span class="code-quote" style="color: #009100">"B"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>SubClassB <span class="code-keyword" style="color: #000091">extends</span> BaseClass {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> subClassBProperty;
<span class="code-comment" style="color: #808080">// further properties and methods ...
</span>}
<span class="code-comment" style="color: #808080">// from a e.g. test and having multiple corresponding documents in the DB, the following query will <span class="code-keyword" style="color: #000091; color: #808080">return</span> the proper objects, but the subClass*Property will be <span class="code-keyword" style="color: #000091; color: #808080">null</span> in all cases.
</span>
<span class="code-keyword" style="color: #000091">final</span> TypedQuery<BaseClass> query = manager.createQuery(<span class="code-quote" style="color: #009100">"SELECT d FROM BaseClass b WHERE b.baseClassProperty=<span class="code-quote" style="color: #009100">'some value'</span>"</span>, BaseClass.class);
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">You can find a fully working example in <a href="https://github.com/dadrus/jpa-unit" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/dadrus/jpa-unit</a> to reproduce this issue. The affected test case is in <a href="https://github.com/dadrus/jpa-unit/blob/master/integration-test/base/src/main/java/eu/drus/jpa/unit/test/AbstractApplyCustomScripsTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/dadrus/jpa-unit/blob/master/integration-test/base/src/main/java/eu/drus/jpa/unit/test/AbstractApplyCustomScripsTest.java</a> (test1() method; line 70) With Hibernate OGM and MongoDB it can be run using <a href="https://github.com/dadrus/jpa-unit/blob/master/integration-test/jpa-mongodb-hibernate-ogm-test/src/test/java/eu/drus/jpa/unit/test/ApplyCustomScripsTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/dadrus/jpa-unit/blob/master/integration-test/jpa-mongodb-hibernate-ogm-test/src/test/java/eu/drus/jpa/unit/test/ApplyCustomScripsTest.java</a>. The aforementioned line is disabled because of this issue. If enabled NPE is thrown with Hibernate OGM and MongoDB.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If you run the same test but for a RDBMS (e.g. from <a href="https://github.com/dadrus/jpa-unit/blob/master/integration-test/jpa2.1-hibernate-test/src/test/java/eu/drus/jpa/unit/test/ApplyCustomScripsTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/dadrus/jpa-unit/blob/master/integration-test/jpa2.1-hibernate-test/src/test/java/eu/drus/jpa/unit/test/ApplyCustomScripsTest.java</a>) everything is fine.</p> </td>
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