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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-9259" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-41896690-b3d5-4eba-9dc8-ee0025dbdd55" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9259" style="color: #3b73af; text-decoration: none">HHH-9259</a>
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Issue Type:
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Affects Versions:
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4.3.5
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Unassigned
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Components:
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core, metamodel
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Created:
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24/Jun/14 3:10 PM
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Environment:
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Hibernate 4.3.5 Final
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Priority:
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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="crancran" id="email_crancran" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=crancran" style="color:#6c797f;; color: #3b73af; text-decoration: none">Chris Cranford</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have created an <tt>Embeddable</tt> class that serves as a table key that extends an already defined <tt>MappedSuperclass</tt> which results in a composite-key for the table.</p>
<div class="code panel" style="border-style: solid;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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<b>BaseId.java</b>
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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">
@MappedSuperclass
<span class="code-keyword" style="color: #000091">public</span> class BaseId <span class="code-keyword" style="color: #000091">implements</span> Serializable {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> customerId;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> facilityId;
/* getter/setters */
}
</pre>
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<div class="code panel" style="border-style: solid;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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<b>MyEntityId.java</b>
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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">
@Embeddable
<span class="code-keyword" style="color: #000091">public</span> class MyEntityId <span class="code-keyword" style="color: #000091">extends</span> BaseId {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> type;
/* getter/setters */
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Now using the JPA Criteria API shown below, the code throws a <tt>NullPointerException</tt> when attempting to find the records:</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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<b>TestCase.java</b>
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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">
<span class="code-keyword" style="color: #000091">public</span> List<MyEntity> runTestCase(List<<span class="code-object" style="color: #910091">Long</span>> customerIds) {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<MyEntity> cq = cb.createQuery(MyEntity.class);
Root<MyEntity> root = cq.from(MyEntity.class);
<span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">this</span> next statement is where the NullPointerException is thrown.
</span> Path<<span class="code-object" style="color: #910091">Long</span>> customerIdPath = root.get(MyEntity_.id).get(MyEntityId_.customerId);
cq.select(root);
cq.where(customerIdPath.in(customerIds));
<span class="code-keyword" style="color: #000091">return</span> em.createQuery(cq).getResultList();
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">After fiddling with this, I have determined that if the <tt>BaseId</tt> class is associated to another class designated as an <tt>Entity</tt>, then the <tt>NullPointerException</tt> isn't thrown an the above query works. However, if the <tt>BaseId</tt> isn't associated to any entity and merely serves as a common class across a series of derived classes, Hibernate will throw the following error:</p>
<div class="preformatted 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="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0 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.jpa.criteria.path.AbstractPathImpl.get(AbstractPathImpl.java:140)
</pre>
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