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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-5a172d79-c9a4-4974-81c8-91cfd811b27c" 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="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"> <span class="diffcontext">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!!There is a long BUG!!<br><br>Hibernate version:5.1.0.Final<br><br>Code between sessionFactory.openSession() and session.close(): <br><br>/***********************CODE*****************************/<br>Criteria criteria = getSession().createCriteria(TbGenerateRecord.class); <br>criteria.setLockMode(LockMode.PESSIMISTIC_WRITE);<br>criteria.setProjection(Projections.rowCount()).uniqueResult();<br>/***********************CODE*****************************/<br><br>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(). <br><br>So now the question is, what's up with this JoinWalker? In this case, it is a CriteriaJoinWalker, which extends AbstractEntityJoinWalker. <br><br>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. <br><br>Why isn't CriteriaJoinWalker calling that initAll method? Here's the relevant code in the CriteriaJoinWalker constructor: <br><br>/***********************CODE*****************************/<br>if ( translator.hasProjection() ) {<br><br>initProjection(translator.getSelect(),translator.getWhereCondition(),translator.getOrderBy(),translator.getGroupBy(),LockOptions.NONE);<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> resultTypes = translator.getProjectedTypes();<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> userAliases = translator.getProjectedAliases();<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> includeInResultRow = new boolean[resultTypes.length];<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> Arrays.fill( includeInResultRow, true );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext">}else {<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> initAll( translator.getWhereCondition(), translator.getOrderBy(), LockOptions.NONE );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> // root entity comes last<br> userAliasList.add( criteria.getAlias() ); <br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> //root entity comes *last*<br> resultTypeList.add( translator.getResultType( criteria ) );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> includeInResultRowList.add( true );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> userAliases = ArrayHelper.toStringArray( userAliasList );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> resultTypes = ArrayHelper.toTypeArray( resultTypeList );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext"> includeInResultRow = ArrayHelper.toBooleanArray( includeInResultRowList );<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br></span> <span class="diffcontext">}<br>/***********************CODE*****************************/<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.<br><br>If there are solutions, please contact me:2245089166@qq.com<br><br>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)</span> </td>
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