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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-10337" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-49cd2bcb-90f5-4e13-a9bc-f65bcbbc8f2c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10337" style="color: #3b73af; text-decoration: none">HHH-10337</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-10337" style="color: #3b73af; text-decoration: none">Aggregate function in select clause causes NPE</a> </span> </td>
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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"> 5.0.1 </td>
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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"> 25/Nov/2015 15:20 PM </td>
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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"> DB independent. Tested on Postgres, Derby, H2 and HSQLDB </td>
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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="atijms" id="email_atijms" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=atijms" style="color:#6c797f;; color: #3b73af; text-decoration: none">arjan tijms</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"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Using an (aggregate) function in the select clause of a query causes a null pointer exception to be thrown.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This happens when using either the JPA Criteria API or JPQL, and using either a constructor expression or a multi-valued select, and in case of the latter using either a <tt>Tuple</tt> or an <tt>Object[]</tt> return. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The following shows example code with an hsqldb specific function:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<b>JPQL query</b>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
SELECT <span class="code-keyword" style="color: #000091">new</span> test.AggregatedTestEntity(
FUNCTION('GROUP_CONCAT', _testEntity.value)
)
FROM
TestEntity _testEntity
</pre>
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<b>Entity</b>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> class TestEntity {
@Id
@GeneratedValue(strategy = IDENTITY)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Long</span> id;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> value;
}
</pre>
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<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<b>Pojo used for ctor expr.</b>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> class AggregatedTestEntity {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> values;
<span class="code-keyword" style="color: #000091">public</span> AggregatedTestEntity(<span class="code-object" style="color: #910091">String</span> values) {
<span class="code-keyword" style="color: #000091">this</span>.values = values;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Executing the above JPQL will cause the following exception to be thrown:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">java.lang.NullPointerException
at org.hibernate.internal.util.ReflectHelper.getConstructor(ReflectHelper.java:309)
at org.hibernate.hql.internal.ast.tree.ConstructorNode.resolveConstructor(ConstructorNode.java:174)
at org.hibernate.hql.internal.ast.tree.ConstructorNode.prepare(ConstructorNode.java:144)
at org.hibernate.hql.internal.ast.HqlSqlWalker.processConstructor(HqlSqlWalker.java:1092)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:2328)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectExprList(HqlSqlBaseWalker.java:2194)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectClause(HqlSqlBaseWalker.java:1476)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:573)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:301)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:249)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:262)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:190)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:76)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:150)
at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:298)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:236)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1825)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:305)
at org.jboss.as.jpa.container.AbstractEntityManager.createQuery(AbstractEntityManager.java:133)
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">A minimal test case is provided here: <a href="https://github.com/javaee-samples/javaee7-samples/tree/master/jpa/aggregate-function-in-select" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/javaee-samples/javaee7-samples/tree/master/jpa/aggregate-function-in-select</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Easiest way to run just that test:</p>
<ul>
<li>Edit <a href="https://github.com/javaee-samples/javaee7-samples" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">root pom.xml</a> to contain only the JPA module:</li>
</ul>
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<pre class="code-xml" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-tag" style="color: #000091"><modules></span>
<span class="code-tag" style="color: #000091"><module></span>test-utils<span class="code-tag" style="color: #000091"></module></span>
<span class="code-tag" style="color: #000091"><module></span>jpa<span class="code-tag" style="color: #000091"></module></span>
<span class="code-tag" style="color: #000091"><module></span>util<span class="code-tag" style="color: #000091"></module></span>
<span class="code-tag" style="color: #000091"></modules></span>
</pre>
</div>
</div>
<ul>
<li>Start WildFly 10</li>
<li>From the root of the project: mvn clean test</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><em>(note that WildFly is the default profile for the samples project, so <tt>-Pwildfly-remote-arquillian</tt> can be omitted)</em></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The problem seems to be that internally Hibernate keeps a list of <tt>Type</tt> instances for every element in the select clause which it matches against the constructor arguments. Only, for the <tt>FUNCTION</tt> this is <tt>Type</tt> is always <tt>null</tt> which eventually causes the NPE to be thrown.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When an <tt>Object[]</tt> or <tt>Tuple</tt> is being returned the same problem occurs that the <tt>Type</tt> is always <tt>null</tt>. Even though there's no matching agains constructor arguments in that case, Hibernate still throws a NPE at some point.</p> </td>
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