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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-10551" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-6d41eef5-d8c4-481a-a4ca-8798941060f5" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10551" style="color: #3b73af; text-decoration: none">HHH-10551</a> </td>
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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-10551" style="color: #3b73af; text-decoration: none">NonIdentifierAttribute.isLazy() returns false when @Basic(fetch=FetchType.LAZY)</a> </span> </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="gabor.varga" id="email_gabor.varga" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gabor.varga" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gábor Varga</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">When setting the {{enableLazyInitialization}} parameter of the {{hibernate-enhance-maven-plugin}}'s configuration to {{true}}, the non-identifier attributes annotated with {{@Basic(fetch = FetchType.LAZY)}} will show as {{LazyPropertyInitializer.UNFETCHED_PROPERTY}} in [{{EntityEntry.getLoadedState()}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/engine/spi/EntityEntry.java#L38], while [{{AbstractEntityTuplizer.getPropertyValues(Object)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/tuple/entity/AbstractEntityTuplizer.java#L493] will show {{null}} current values because [{{NonIdentifierAttribute.isLazy()}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/tuple/NonIdentifierAttribute.java#L17] returns {{false}}.<br><br>This causes a problem in [{{DefaultFlushEntityEventListener.dirtyCheck(FlushEntityEvent)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultFlushEntityEventListener.java#L465], where the two different representations are stored in the following two variables:<br>{code:java}<br>final Object[] loadedState = entry.getLoadedState();<br>final Object[] values = event.getPropertyValues();<br>{code}<br>And then (when there is no {{findDirty()}} interceptor override, and the entity is not an instance of {{SelfDirtinessTracker}}, so the {{enableDirtyTracking}} parameter of the {{hibernate-enhance-maven-plugin}} configuration is {{false}}), the dirty check is performed by [{{AbstractEntityPersister.findDirty(Object\[\] currentState, Object\[\] previousState, Object entity, SessionImplementor session)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/persister/entity/AbstractEntityPersister.java#L4079], and then forwarded to [{{TypeHelper.findDirty(NonIdentifierAttribute\[\] properties, Object\[\] currentState, Object\[\] previousState, boolean\[\]\[\] includeColumns, boolean anyUninitializedProperties, SessionImplementor session)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/type/TypeHelper.java#L282]. This checks if the current state holds {{LazyPropertyInitializer.UNFETCHED_PROPERTY}}, but it holds {{null}} instead (as described in the first paragraph). These two values are then compared in the appropriate {{Type}} subclass' {{isDirty()}}, {{isSame()}} and {{isEqual()}} methods, which (depending on the actual implementation) either return an incorrect dirty state (and then an unnecessary UPDATE is scheduled in [{{DefaultFlushEntityEventListener.onFlushEntity(FlushEntityEvent)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultFlushEntityEventListener.java#L143]), or throw an exception (e.g. {{ClassCastException}} when comparing a primitive byte array to {{LazyPropertyInitializer.UNFETCHED_PROPERTY}}.<br><br>In my opinion, the problem lies in [{{NonIdentifierAttribute.isLazy()}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/tuple/NonIdentifierAttribute.java#L17] returning {{false}} in {{AbstractEntityTuplizer.getPropertyValues(Object)}}, causing the current state array to hold {{null}} instead of {{LazyPropertyInitializer.UNFETCHED_PROPERTY}}.</span> <span class="diffaddedchars" style="background-color:#ddfade;"> These different values are also visible in [{{Interceptor.findDirty</span> <span class="diffcontext"> (</span> <span class="diffaddedchars" style="background-color:#ddfade;">Object, Serializable, Object\[\], Object\[\], String\[\], Type\[\])}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/Interceptor.java#L198]'s {{currentState}} and {{previousState}} arrays. (</span> <span class="diffcontext">As far as I can tell, no {{Type}} subclasses are prepared to handle {{LazyPropertyInitializer.UNFETCHED_PROPERTY}} directly, so it shouldn't be propagated to them from {{TypeHelper.findDirty()}}.)<br><br>The code path of the error that I've observed:<br>- [{{DefaultFlushEntityEventListener.onFlushEntity(FlushEntityEvent)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultFlushEntityEventListener.java#L125]<br>- [{{DefaultFlushEntityEventListener.isUpdateNecessary(FlushEntityEvent, boolean)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultFlushEntityEventListener.java#L211]<br>- [{{DefaultFlushEntityEventListener.dirtyCheck(FlushEntityEvent)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultFlushEntityEventListener.java#L465]<br>- [{{AbstractEntityPersister.findDirty(Object\[\], Object\[\], Object, SessionImplementor)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/persister/entity/AbstractEntityPersister.java#L4079]<br>- [{{TypeHelper.findDirty(NonIdentifierAttribute\[\], Object\[\], Object\[\], boolean\[\]\[\], boolean, SessionImplementor)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/type/TypeHelper.java#L282]<br>- [{{Type.isDirty(Object, Object, boolean\[\], SessionImplementor)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/type/Type.java#L263]<br>- [{{Type.isDirty(Object, Object, SessionImplementor)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/type/Type.java#L249]<br>- [{{Type.isSame(Object, Object)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/type/Type.java#L167]<br>- [{{Type.isEqual(Object, Object)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/type/Type.java#L184]<br><br>First I've observed this problem with a {{UserType}} field, but I could reproduce it with {{byte[]}} too.<br><br>Setting {{enableDirtyTracking}} to {{true}} is a possible workaround, as [{{DefaultFlushEntityEventListener.dirtyCheck(FlushEntityEvent)}}|https://github.com/hibernate/hibernate-orm/blob/5.0.8/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultFlushEntityEventListener.java#L465] uses a different code path in that case.<br><br>My original {{hibernate-enhance-maven-plugin}} configuration:<br>{code:xml}<br><configuration><br> <enableLazyInitialization>true</enableLazyInitialization><br> <enableDirtyTracking>false</enableDirtyTracking><br> <enableAssociationManagement>false</enableAssociationManagement><br> <enableExtendedEnhancement>false</enableExtendedEnhancement><br></configuration><br>{code}</span> </td>
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