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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/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12049" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-32ea7899-3a5d-45f7-b106-f08fb5889a2f" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12049" style="color: #3b73af; text-decoration: none">HHH-12049</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/HHH-12049" style="color: #3b73af; text-decoration: none">getReference and @Inheritance</a> </span> </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-avatar-32ea7899-3a5d-45f7-b106-f08fb5889a2f" 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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 20/Oct/2017 12:39 PM </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="christor" id="email_christor" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=christor" style="color:#6c797f;; color: #3b73af; text-decoration: none">Chris Rued</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">With entities</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">
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorValue(value = <span class="code-quote" style="color: #009100">"E1"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>MyEntity1 {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
...
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">extended by</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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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">
@Entity
@DiscriminatorValue(value = <span class="code-quote" style="color: #009100">"E2"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>MyEntity2 <span class="code-keyword" style="color: #000091">extends</span> MyEntity1 {
...
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">With data prepared so that there is a instance of <tt>MyEntity2</tt> persisted and the following findOne works:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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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">
MyEntity2 theEntity = (MyEntity2) em.find(MyEntity1.class, id); <span class="code-comment" style="color: #808080">// Successful load</span>
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Will result in a ClassCastException with the findOne in the following:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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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">
MyEntity1 theRef = em.getReference(MyEntity1.class, id); <span class="code-comment" style="color: #808080">// Note <span class="code-keyword" style="color: #000091; color: #808080">this</span> is a getOne
</span>MyEntity2 theEntity = (MyEntity2) em.find(MyEntity1.class, id); <span class="code-comment" style="color: #808080">// ClassCastException</span>
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This seems to be due to the reference first being stored in the session with only the superclass, causing the surprise in the call to find later.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This makes it so that entities loaded with <tt>getReferences</tt> cannot be used where references loaded with <tt>find</tt> can be used, even when later loaded using <tt>find</tt>.</p>
<ul>
<li>hibernate-core:5.0.12.Final</li>
<li>hibernate-jpa-2.1-api:1.0.0.Final</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Suggested improvement: When getting a reference to a class with <tt>@Inheritance</tt>, make a database call to check the <tt>@Discriminator</tt> so that the correct type of proxy can be returned.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">(somewhat related to this, I'm seeing a change in behavior in how getReference works ... is used to be that a null would be returned when called with a non-existent ID, but now a reference is returned that causes an exception when properties are accessed ... this seems ok to me, but may be noteworthy)</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">FYI, a related issue was created in spring-boot <a href="https://jira.spring.io/browse/DATAJPA-1206" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://jira.spring.io/browse/DATAJPA-1206</a>, but closed as "works as intended" ...</p> </td>
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