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<a class="user-hover" rel="rogersuen" id="email_rogersuen" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=rogersuen" style="color:#6c797f;">Roger Suen</a>
edited a comment on <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-6982'>HHH-6982</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-6982'><strong>ForeignKeys$Nullifier thinks a detached proxy is attached if another object with the same identifier is associated with the persistence context</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>I have the same problem: trying to persist an entity with a reference to a detached, uninitialised proxy when an entity with the same id as the proxy exists in the current persistence context will cause a LazyInitializationException. </p>
<p>I have added a test to reproduce the issue. The test is simple as described by Martin. Here's the code:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">@Test
<span class="code-keyword">public</span> void test() {
<span class="code-comment">// prepare data
</span> em.getTransaction().begin();
User user = <span class="code-keyword">new</span> User(1, <span class="code-quote">"Roger"</span>, <span class="code-quote">"Suen"</span>);
em.persist(user);
Message message = <span class="code-keyword">new</span> Message(1, <span class="code-quote">"foo"</span>, <span class="code-quote">"bar"</span>, user);
em.persist(message);
em.getTransaction().commit();
<span class="code-comment">// start with an empty context
</span> em.clear();
Message entityMessage = em.find(Message.class, 1);
User proxyUser = entityMessage.getUser();
assertNotNull(entityMessage);
assertNotNull(proxyUser);
assertFalse(emf.getPersistenceUnitUtil().isLoaded(proxyUser));
<span class="code-comment">// make proxyUser a detached, uninitialized proxy.
</span> em.clear();
<span class="code-comment">// load the User object with the same id into the context
</span> User entityUser = em.find(User.class, 1);
assertNotNull(entityUser);
<span class="code-comment">// <span class="code-keyword">try</span> to persist a <span class="code-keyword">new</span> message with reference to the proxy
</span> em.getTransaction().begin();
Message transientMessage = <span class="code-keyword">new</span> Message(2, <span class="code-quote">"foo"</span>, <span class="code-quote">"bar"</span>, proxyUser);
<span class="code-comment">// <span class="code-keyword">throw</span> org.hibernate.LazyInitializationException: could not initialize proxy - no Session
</span> em.persist(transientMessage);
em.getTransaction().commit();
}</pre>
</div></div>
<p>The exception is as follow:</p>
<p>...<br/>
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy - no Session<br/>
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)<br/>
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:285)<br/>
at org.hibernate.engine.internal.ForeignKeys$Nullifier.isNullifiable(ForeignKeys.java:142)<br/>
at org.hibernate.engine.internal.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:94)<br/>
at org.hibernate.engine.internal.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:72)<br/>
at org.hibernate.action.internal.AbstractEntityInsertAction.nullifyTransientReferencesIfNotAlready(AbstractEntityInsertAction.java:128)<br/>
at org.hibernate.action.internal.AbstractEntityInsertAction.makeEntityManaged(AbstractEntityInsertAction.java:139)<br/>
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:209)<br/>
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:183)<br/>
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:136)<br/>
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:328)<br/>
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)<br/>
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)<br/>
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:136)<br/>
at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)<br/>
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)<br/>
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)<br/>
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)<br/>
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:843)<br/>
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:818)<br/>
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:822)<br/>
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:865)</p></div>
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