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<a class="user-hover" rel="bvarner" id="email_bvarner" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=bvarner" style="color:#6c797f;">Bryan Varner</a>
created <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7953'>HHH-7953</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7953'><strong>EntityManager.find() returning uninitialized proxy reference</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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4.1.8 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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entity-manager </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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28/Jan/13 3:57 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>Running Hibernate 4.1.8 in a GlassFish container.</p>
<p style='margin-top:0;margin-bottom:10px;'>My domain model looks something like:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">@Entity(name = <span class="code-quote">"parent"</span>)
@Table(name = <span class="code-quote">"parent"</span>)
<span class="code-keyword">public</span> class Parent ... {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = <span class="code-quote">"parent_id_seq"</span>)
@SequenceGenerator(name = <span class="code-quote">"parent_id_seq"</span>, sequenceName = <span class="code-quote">"parent_id_seq"</span>, allocationSize = 100)
@Column(name = <span class="code-quote">"id"</span>, nullable = <span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">Long</span> id;
@JoinColumn(name = <span class="code-quote">"child"</span>, referencedColumnName = <span class="code-quote">"id"</span>, nullable = <span class="code-keyword">true</span>)
@ManyToOne(optional = <span class="code-keyword">true</span>, cascade = CascadeType.ALL, fetch = FetchType.LAZY)
<span class="code-keyword">private</span> Child child;
....
}
@Entity(name = <span class="code-quote">"child"</span>)
@Table(name = <span class="code-quote">"child"</span>)
<span class="code-keyword">public</span> class Child .... {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = <span class="code-quote">"child_id_seq"</span>)
@SequenceGenerator(name = <span class="code-quote">"child_id_seq"</span>, sequenceName = <span class="code-quote">"child_id_seq"</span>, allocationSize = 100)
@Column(name = <span class="code-quote">"id"</span>, nullable = <span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">Long</span> id;
...
}</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>I have a block of code that's looking for Child with:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">entityManager.find(Child.class, id);</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>This is returning an javaassist lazy proxy instance, rather than the fully initialized Child instance I'd expect.</p>
<p style='margin-top:0;margin-bottom:10px;'>Basically, I'd expect getReference(Child.class, id) to give me a lazy proxy reference, but not find().</p>
<p style='margin-top:0;margin-bottom:10px;'>If I change the code to:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">entityManager.clear();
entityManager.find(Child.class, id);</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>I get a fully initialized Child instance, as I'd expect.</p>
<p style='margin-top:0;margin-bottom:10px;'>It's worth noting that my Child and Parent classes are not @Cacheable</p>
<p style='margin-top:0;margin-bottom:10px;'>Digging into the execution that's taking place in this TX, I'm seeing something along these lines (Sorry, I don't have time to put together a test case this week - but I will do my best to make time next week).</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">Parent p = entityManager.find(Parent.class, 1);
<span class="code-comment">// The returned p has a Child with the id of 20
</span>
<span class="code-comment">// later in the TX, in a totally different class where code scope only has access to the ID of the child, and knows nothing about the parent instance...
</span>
Child c = entityManager.find(Child.class, 20);
<span class="code-comment">// c = a lazy reference, just like I'd get from entityManager.getReference(Child.class, 20);</span></pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>If I invoke entityManager.clear(); prior to looking for the Child with id 20, I get the Child object.</p>
<p style='margin-top:0;margin-bottom:10px;'>It looks like the entitymanager is return cached <em>references</em> for find() instead of cached <em>instances</em>.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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Hibernate 4.1.8 entitymanager, PostgreSQL 9.1, Oracle JDK 7 64bit linux.
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<a class="user-hover" rel="bvarner" id="email_bvarner" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=bvarner" style="color:#6c797f;">Bryan Varner</a>
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