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#email-banner { padding: 8px 8px 0 8px !important; }
#email-avatar { margin: 1px 8px 8px 0 !important; padding: 0 !important; }
#email-fields { padding: 0 8px 8px 8px !important; }
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}
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<img id="email-avatar" src="https://hibernate.onjira.com/secure/useravatar?avatarId=10162" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
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<a class="user-hover" rel="johnw@newconceptsdev.com" id="email_johnw@newconceptsdev.com" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=johnw%40newconceptsdev.com" style="color:#6c797f;">John Walker</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-7920'>HHH-7920</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7920'><strong>CollectionLoadContext::endLoadingCollection() Executes Queued Writes *Before* Taking Snapshot (In Some Circumstances)</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</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%;">
<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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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
3.6.10 </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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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
core </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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11/Jan/13 2:08 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;'>I am unsure about how to create a test case for this one. Reproduction steps:</p>
<ol>
<li>Setup two entities with a bidirectional @OneToMany/@ManyToOne relationship like this:
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">@Entity
class Parent
{
@OneToMany(mappedBy=<span class="code-quote">"parent"</span>, cascade=CascadeType.ALL)
<span class="code-keyword">public</span> List<Child> children;
}
@Entity
class Child
{
@ManyToOne
<span class="code-keyword">public</span> Parent parent;
}</pre>
</div></div></li>
<li>Create and persist a Parent with no children.</li>
<li>In a new session, load the Parent from the database.</li>
<li>Add a transient Child to the children collection.</li>
<li>Call a read operation like .size() on the children collection.</li>
<li>Attempt to persist the Parent</li>
<li>Exception will result</li>
</ol>
<p style='margin-top:0;margin-bottom:10px;'>The ultimate issue: </p>
<ol>
<li>When user does PersistentBag.add() under these circumstances write operation is queued.</li>
<li>PersistentBag.size() triggers PersistentBag.read() which triggers PersistentBag.initialize()</li>
<li><b>org.hibernate.engine.loading.CollectionLoadContext::endLoadingCollection() is eventually called. This is where the actual bug is.</b>
<ol>
<li>endLoadingCollection() calls org.hibernate.collection.AbstractPersistentCollection::endRead() which flushes all queued operations.</li>
<li><b>AFTER</b> flushing queued operations, endLoadingCollection() calls org.hibernate.enging.CollectionEntry::postInitialize() which creates what is supposed to be the pre-write snapshot of the bag.</li>
</ol>
</li>
<li>Bag snapshot is now incorrect – it contains all entities queued for write. If any of these entities are transient, they will cause an exception in org.hibernate.collection.AbstractPersistentCollection.getOrpahans(). When it iterates over the old snapshot, it makes a call to org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved() that cannot handle transient entities. Normally this wouldn't be an issue, but because snapshot contains queued writes, it can contain transient entities.</li>
</ol>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
</td>
<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
Hibernate 3.6.10, any database platform.
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
</td>
<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;">Labels:</strong>
</td>
<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
hibernate
core
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<strong style="font-weight:normal;color:#505050;">Priority:</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%;">
<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>
</td>
<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="johnw@newconceptsdev.com" id="email_johnw@newconceptsdev.com" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=johnw%40newconceptsdev.com" style="color:#6c797f;">John Walker</a>
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