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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-7071" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-88fb99e3-0066-4889-be02-9b52160c765b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-7071" style="color: #3b73af; text-decoration: none">HHH-7071</a> </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">Change By:</th>
<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="crancran" id="email_crancran" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=crancran" style="color:#6c797f;; color: #3b73af; text-decoration: none">Chris Cranford</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">Given an abstract parent class :<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext"><br> <class abstract="true"<br> name="pojo.Product" table="Product"><br> <id column="ID" name="id"><br> <generator class="native" /><br> </id><br> <discriminator column="type" type="java.lang.String"<br> force="true" /><br>[...]<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext"><br>and one (or more) subclasses, defined in a separate file : <br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}<br></span> <span class="diffcontext"> <subclass discriminator-value="Childroduct"<br> extends="pojo.Product"<br> lazy="true" name="pojo.plugin.ChildProduct"><br> <join fetch="join" table="ChildProduct"><br> <key column="productID" /><br>[...]<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br></span> <span class="diffcontext">The separate file can be loaded or not in the hibernate configuration, with a plugin system. That's why force=true was placed on the discriminator element.<br><br>Given this class that have a relationship with the parent class :<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext"><br> <class name="pojo.ProductCategory"><br> <id column="ID" name="id"><br> <generator class="native"/><br> </id><br> <property name="code"/><br> <property name="description"/><br> <bag name="products" table="product_productcategory"><br> <key column="productCategoryID"/><br> <many-to-many class="pojo.Product" column="productID" /><br> </bag><br> </class><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext"><br><br>The following code throws an exeception :<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{code}</span> <span class="diffcontext"><br>ProductCategory pc = productCategoryDao.findById(1);<br><br>for (Product product: pc.getProducts()) {<br> System.out.println(product.getId());<br>}<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{code}</span> <span class="diffcontext"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}<br></span> <span class="diffcontext">Caught: org.hibernate.WrongClassException: Object with id: 592 was not of the specified subclass: pojo.Product (Discriminator: ChildProduct)<br>org.hibernate.WrongClassException: Object with id: 592 was not of the specified subclass: pojo.Product (Discriminator: ChildProduct)<br> at org.hibernate.loader.Loader.getInstanceClass(Loader.java:1626)<br> at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1460)<br> at org.hibernate.loader.Loader.getRow(Loader.java:1384)<br> at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:640)<br> at org.hibernate.loader.Loader.doQuery(Loader.java:856)<br> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)<br> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)<br> at org.hibernate.loader.Loader.loadCollection(Loader.java:2175)<br> at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:61)<br> at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:622)<br> at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:82)<br> at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1606)<br> at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:379)<br> at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:112)<br> at org.hibernate.collection.internal.PersistentBag.iterator(PersistentBag.java:266)<br></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext"><br><br>The generated SQL to load the Product collection doesn't contains a WHERE clause to limit the result to known discriminators values.<br><br></span> </td>
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