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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-5a1b775a-de61-43a3-800a-b9e0b3f9d51a" 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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<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"> <span class="diffcontext">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.<br><br>E.g.<br><br>{code:java}<br></span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">// Some comments here<br></span> <span class="diffcontext">@Entity<br>@Inheritance(strategy = InheritanceType.SINGLE_TABLE)<br>@DiscriminatorColumn(name = "TYPE")<br>public abstract class BaseClass {<br> private String baseClassProperty;<br>}<br><br>@Entity<br>@DiscriminatorValue(value = "A")<br>public class SubClassA extends BaseClass {<br> private String subClassAProperty;<br> <br> // further properties and methods ...<br>}<br><br>@Entity<br>@DiscriminatorValue(value = "B")<br>public class SubClassB extends BaseClass {<br> private String subClassBProperty;<br><br> // further properties and methods ...<br>}<br><br>// from a e.g. test and having multiple corresponding documents in the DB, the following query will return the proper objects, but the subClass*Property will be null in all cases.<br><br>final TypedQuery<BaseClass> query = manager.createQuery("SELECT</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> d</span> <span class="diffaddedchars" style="background-color:#ddfade;"> b</span> <span class="diffcontext"> FROM BaseClass b WHERE b.baseClassProperty='some value'", BaseClass.class);<br>{code}<br><br>You can find a fully working example in https://github.com/dadrus/jpa-unit to reproduce this issue. The affected test case is in https://github.com/dadrus/jpa-unit/blob/master/integration-test/base/src/main/java/eu/drus/jpa/unit/test/AbstractApplyCustomScripsTest.java (test1() method; line 70) With Hibernate OGM and MongoDB it can be run using 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. The aforementioned line is disabled because of this issue. If enabled NPE is thrown with Hibernate OGM and MongoDB.<br><br>If you run the same test but for a RDBMS (e.g. from https://github.com/dadrus/jpa-unit/blob/master/integration-test/jpa2.1-hibernate-test/src/test/java/eu/drus/jpa/unit/test/ApplyCustomScripsTest.java) everything is fine.<br><br></span> </td>
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