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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-11187" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-26b7c659-9580-4b9e-9712-6b655a512843" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11187" style="color: #3b73af; text-decoration: none">HHH-11187</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-11187" style="color: #3b73af; text-decoration: none">NPE when using Criteria+Projection+LockMode</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-26b7c659-9580-4b9e-9712-6b655a512843" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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"> 5.1.0 </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"> Unassigned </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"> 20/Oct/2016 08:31 AM </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-static-major-38c143b2-1a52-4e4d-8c6b-f8dd8500426d" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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="BlackFlag" id="email_BlackFlag" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=BlackFlag" style="color:#6c797f;; color: #3b73af; text-decoration: none">Ma</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">I have a problem to lock some row when I use a projection to get entity count ,and occur nullPointerException ! I stepped through the hibernate code in the debugger. This is a BUG!<span class="error">Unable to render embedded object: File (There is a long BUG) not found.</span>!</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Hibernate version:5.1.0.Final</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Code between sessionFactory.openSession() and session.close(): </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">/**********************<b>CODE</b>****************************/<br> Criteria criteria = getSession().createCriteria(TbGenerateRecord.class); <br> criteria.setLockMode(LockMode.PESSIMISTIC_WRITE);<br> criteria.setProjection(Projections.rowCount()).uniqueResult();<br> /**********************<b>CODE</b>****************************/</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">soon after,I stepped through the hibernate code in the debugger.<br> The NullPointerException in CriteriaLoader.applyLocks happens because its local "entityAliases" array is null; that array is null because the "aliases" field (defined in OuterJoinLoader) is null. So the question is, where did (or should) OuterJoinLoader.aliases come from? Well, it comes from a method called initFromWalker(JoinWalker walker), which calls walker.getAliases(). </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">So now the question is, what's up with this JoinWalker? In this case, it is a CriteriaJoinWalker, which extends AbstractEntityJoinWalker. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Where, then, does (or should) JoinWalker.aliases get initalized? It happens in a method called initPersisters. This method, in turn, is called by the AbstractEntityJoinWalker.initAll method. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Why isn't CriteriaJoinWalker calling that initAll method? Here's the relevant code in the CriteriaJoinWalker constructor: </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">/**********************<b>CODE</b>****************************/<br> if ( translator.hasProjection() ) </p> { initProjection( translator.getSelect(), translator.getWhereCondition(), translator.getOrderBy(), translator.getGroupBy(), LockOptions.NONE ); resultTypes = translator.getProjectedTypes(); userAliases = translator.getProjectedAliases(); includeInResultRow = new boolean[resultTypes.length]; Arrays.fill( includeInResultRow, true ); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> else </p> { initAll( translator.getWhereCondition(), translator.getOrderBy(), LockOptions.NONE ); // root entity comes last userAliasList.add( criteria.getAlias() ); //root entity comes *last* resultTypeList.add( translator.getResultType( criteria ) ); includeInResultRowList.add( true ); userAliases = ArrayHelper.toStringArray( userAliasList ); resultTypes = ArrayHelper.toTypeArray( resultTypeList ); includeInResultRow = ArrayHelper.toBooleanArray( includeInResultRowList ); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">/**********************<b>CODE</b>****************************/<br> So, when there's a projection, we don't call the initAll method, and so the aliases field is never initialized. NPE is not a helpful error message.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If there are solutions, please contact me:2245089166@qq.com</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Full stack trace of any exception that occurs: <br> java.lang.NullPointerException<br> at org.hibernate.loader.criteria.CriteriaLoader.applyLocks(CriteriaLoader.java:237)<br> at org.hibernate.loader.Loader.preprocessSQL(Loader.java:234)<br> at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1894)<br> at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1874)<br> at org.hibernate.loader.Loader.doQuery(Loader.java:919)<br> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)<br> at org.hibernate.loader.Loader.doList(Loader.java:2610)<br> at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2452)<br> at org.hibernate.loader.Loader.list(Loader.java:2414)<br> at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:109)<br> at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1787)<br> at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:363)<br> at org.hibernate.internal.CriteriaImpl.uniqueResult(CriteriaImpl.java:385)<br> at net.yasion.common.utils.HibernateUtils.countByCriteria(HibernateUtils.java:274)<br> at net.yasion.common.dao.impl.BaseDAOImpl.sourceListByCriteria(BaseDAOImpl.java:574)<br> at net.yasion.common.dao.impl.BaseDAOImpl.listByCriteria(BaseDAOImpl.java:484)<br> at net.yasion.shortlink.service.impl.LinkServiceImpl.shortLink(LinkServiceImpl.java:126)</p> </td>
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