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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-10162" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-909cd95e-9fab-4f5b-8468-b3dfc0445f9b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-10162" style="color: #3b73af; text-decoration: none">HHH-10162</a>
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<td style="vertical-align: top;; padding: 0px; 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-10162" style="color: #3b73af; text-decoration: none">Inheritance and L2 cache</a> </span>
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Issue Type:
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Affects Versions:
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4.3.11
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Unassigned
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Components:
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hibernate-core
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Created:
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04/Oct/2015 02:32 AM
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metamodel core performance
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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="demon101" id="email_demon101" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=demon101" style="color:#6c797f;; color: #3b73af; text-decoration: none">demon101</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Simple app works wrong with following entity structure</p>
<div class="code 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">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity(name=<span class="code-quote" style="color: #009100">"some_table"</span>)
@Inheritance(strategy= InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn( name=<span class="code-quote" style="color: #009100">"TYPE"</span>, discriminatorType=DiscriminatorType.STRING )
<span class="code-keyword" style="color: #000091">abstract</span> class EntityBase {
@Id
@GeneratedValue(strategy= GenerationType.AUTO)
@Column
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> id;
}
@Entity
@DiscriminatorValue(<span class="code-quote" style="color: #009100">"EntityA"</span>)
@Cacheable
class EntityA <span class="code-keyword" style="color: #000091">extends</span> EntityBase {
@Column
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> aColumn;
...
}
@Entity
@DiscriminatorValue(<span class="code-quote" style="color: #009100">"EntityB"</span>)
@Cacheable
class EntityB <span class="code-keyword" style="color: #000091">extends</span> EntityBase {
@Column
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> bColumn;
...
}
@Entity(name=<span class="code-quote" style="color: #009100">"holder_table"</span>)
@Cacheable
class HolderEntity {
@Id
@GeneratedValue(strategy= GenerationType.AUTO)
@Column
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> id;
@ManyToOne(fetch=FetchType.LAZY)
EntityBase holdedEntity;
...
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">For first load or without cache everything works well</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">After loading of HolderEntity instance from cache, holdedEntity field initialised by object with type EntityBase (abstract class).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Pseudocode:</p>
<div class="code 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 class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
def a = HolderEntity.get(1)
<span class="code-keyword" style="color: #000091">assert</span> a.holdedEntity.class!=EntityBase <span class="code-comment" style="color: #808080">//ok
</span>a = HolderEntity.get(1) <span class="code-comment" style="color: #808080">// load from cache
</span><span class="code-keyword" style="color: #000091">assert</span> a.holdedEntity.class!=EntityBase <span class="code-comment" style="color: #808080">//fails</span>
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">During loading from cache hibernate construct entity using special logic: for field it detect class type by variable type (it's EntityBase class) instead of discriminator (final Type[] types = subclassPersister.getPropertyTypes(); in DefaultLoadEventListener) and call method<br /> SessionImpl.internalLoad(String entityName, Serializable id, boolean eager, boolean nullable) witch "instantiate" abstract class and init fields by data from hibernate cache</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">It works same for lazy & eager loading of holdedEntity Class type stored in AbstractEntityPersister.EntityMetamodel. It looks like, field type for cache is static, but it's should depend on instance of field</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">How to solve it without disabling of hibernate L2 cache?</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Test case <a href="https://github.com/demon101/hibernate-l2-inheritence" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/demon101/hibernate-l2-inheritence</a><br /> <a href="https://github.com/demon101/hibernate-l2-inheritence/blob/master/src/test/java/com/test/hibernate/L2InheritanceTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/demon101/hibernate-l2-inheritence/blob/master/src/test/java/com/test/hibernate/L2InheritanceTest.java</a></p>
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