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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-8924" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-973b7e18-c315-45e9-8bc6-3930fb8f865c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-8924" style="color: #3b73af; text-decoration: none">HHH-8924</a>
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Issue Type:
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Affects Versions:
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4.3.1
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Unassigned
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singletable.zip
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Components:
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core
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Created:
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02/Feb/14 2:52 AM
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Reporter:
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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"> <a class="user-hover" rel="jbraeuchi" id="email_jbraeuchi" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=jbraeuchi" style="color:#6c797f;; color: #3b73af; text-decoration: none">Jakob Braeuchi</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">i have a class with two OneToMany relations pointing to different leafs of a class hierarchy mapped to a single table.</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = <span class="code-quote" style="color: #009100">"personId"</span>)
<span class="code-keyword" style="color: #000091">private</span> List<Book> books = <span class="code-keyword" style="color: #000091">new</span> ArrayList<Book>();
@OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = <span class="code-quote" style="color: #009100">"personId"</span>)
<span class="code-keyword" style="color: #000091">private</span> List<FavoriteBook> favoriteBooks = <span class="code-keyword" style="color: #000091">new</span> ArrayList<FavoriteBook>();
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">both classes Book and FavoriteBook inherit from AbstractBook which defines a SingleTableInheritance:</p>
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@Entity
@Table(name = <span class="code-quote" style="color: #009100">"ST_BOOK"</span>, uniqueConstraints = { @UniqueConstraint(columnNames = { <span class="code-quote" style="color: #009100">"author"</span>, <span class="code-quote" style="color: #009100">"name"</span> }) })
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
<span class="code-comment" style="color: #808080">//@DiscriminatorOptions(force = <span class="code-keyword" style="color: #000091; color: #808080">true</span>) // prevent WrongClassException
</span><span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">abstract</span> class AbstractBook {
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When i load a person and access the relationships, Hibernate does not include the discriminator in the select and ends up with the following exception:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">org.hibernate.WrongClassException: Object [id=1] was not of the specified subclass [brj.entities.FavoriteBook] : loaded object was of wrong class class brj.entities.Book
at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.hydrateEntityState(EntityReferenceInitializerImpl.java:203)
at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:107)
at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:129)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:138)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102)
at org.hibernate.loader.collection.plan.AbstractLoadPlanBasedCollectionInitializer.initialize(AbstractLoadPlanBasedCollectionInitializer.java:102)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:693)
at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:92)
at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1893)
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">As a workaround i could a a Hibernate-specific annotation to the Root of my Class hierarchy, but i'd prefer to stick to JPA-Annotations.</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.annotations.DiscriminatorOptions;
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"ST_BOOK"</span>, uniqueConstraints = { @UniqueConstraint(columnNames = { <span class="code-quote" style="color: #009100">"author"</span>, <span class="code-quote" style="color: #009100">"name"</span> }) })
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorOptions(force = <span class="code-keyword" style="color: #000091">true</span>) <span class="code-comment" style="color: #808080">// prevent WrongClassException
</span><span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">abstract</span> class AbstractBook {
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">there's another (quite old) issue about WrongClassException <a href="https://hibernate.atlassian.net/browse/HHH-5954" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://hibernate.atlassian.net/browse/HHH-5954</a> but without OneToManyRelations.</p>
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