<style>
/* Changing the layout to use less space for mobiles */
@media screen and (max-device-width: 480px), screen and (-webkit-min-device-pixel-ratio: 2) {
#email-body { min-width: 30em !important; }
#email-page { padding: 8px !important; }
#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; }
#email-gutter { width: 0 !important; }
}
</style>
<div id="email-body">
<table id="email-wrap" align="center" border="0" cellpadding="0" cellspacing="0" style="background-color:#f0f0f0;color:#000000;width:100%;">
<tr valign="top">
<td id="email-page" style="padding:16px !important;">
<table align="center" border="0" cellpadding="0" cellspacing="0" style="background-color:#ffffff;border:1px solid #bbbbbb;color:#000000;width:100%;">
<tr valign="top">
<td bgcolor="#3e4c4e" style="background-color:#3e4c4e;color:#ffffff;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;line-height:1;"><img src="https://www.jboss.org/dms/hibernate/images/jira/jiraheader_hibernate.png" alt="" style="vertical-align:top;" /></td>
</tr><tr valign="top">
<td id="email-banner" style="padding:32px 32px 0 32px;">
<table align="left" border="0" cellpadding="0" cellspacing="0" width="100%" style="width:100%;">
<tr valign="top">
<td style="color:#505050;font-family:Arial,FreeSans,Helvetica,sans-serif;padding:0;">
<img id="email-avatar" src="https://secure.gravatar.com/avatar/e5746525988d570da0b94f1c040224ba?d=mm&s=48" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
<div id="email-action" style="padding: 0 0 8px 0;font-size:12px;line-height:18px;">
<a class="user-hover" rel="sguillem" id="email_sguillem" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=sguillem" style="color:#6c797f;">GUILLEMOT</a>
commented on <img src="https://hibernate.atlassian.net/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.atlassian.net/browse/HHH-7867'>HHH-7867</a>
</div>
<div id="email-summary" style="font-size:16px;line-height:20px;padding:2px 0 16px 0;">
<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.atlassian.net/browse/HHH-7867'><strong>NPE in org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes</strong></a>
</div>
</td>
</tr>
</table>
</td>
</tr>
<tr valign="top">
<td id="email-fields" style="padding:0 32px 32px 32px;">
<table border="0" cellpadding="0" cellspacing="0" style="padding:0;text-align:left;width:100%;" width="100%">
<tr valign="top">
<td id="email-gutter" style="width:64px;white-space:nowrap;"></td>
<td>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr valign="top">
<td colspan="2" style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 16px 0;width:100%;">
<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>We encoutered 2 stacktraces with the same cause : </p>
<p>The Map.Entry returned by IdentityMap.concurrentEntries, which call IdentityMap.entryArray has a potential bug : </p>
<ul class="alternate" type="square">
<li>result array is created from map size</li>
<li>but filled with entrySet.size</li>
</ul>
<p>It happens that entrySet.size and map size are not the same (normal according to javadoc, entrySet is constant for an iteration)</p>
<p>My use case is the following (with EJB 3.1, JBoss AS 7.1.1 container) :<br/>
calling transaction (public method of my EJB)</p>
<ul class="alternate" type="square">
<li>load objects</li>
<li>multithread tasks that use objects</li>
<li>wait for end tasks</li>
<li>find in database (which makes the flush call)</li>
</ul>
<p>But I don't realy understand why in my own transaction, the persistenceContext.getEntityEntries() map evolve... after the multithread tasks I'm back in a single transaction. </p>
<p>In any case to avoid this, build the array with entrySet.size instead of map.size seems a better solution.<br/>
In my own use case, I'll try to find why persistenceContext.getEntityEntries() evolve or try to patch hibernate to test this.</p>
<p>Here is IdentityMap.entryArray source code form 4.1.7, (seems same in 4.2.2).</p>
<p> @SuppressWarnings( </p>
{"unchecked"}
<p>)<br/>
public Map.Entry[] entryArray() {<br/>
if (dirty) {<br/>
entryArray = new Map.Entry[ map.size() ];<br/>
Iterator itr = map.entrySet().iterator();<br/>
int i=0;<br/>
while ( itr.hasNext() ) </p>
{
Map.Entry me = (Map.Entry) itr.next();
entryArray[i++] = new IdentityMapEntry( ( (IdentityKey) me.getKey() ).key, me.getValue() );
}
<p> dirty = false;<br/>
}<br/>
return entryArray;<br/>
}</p>
<p>The stacktraces : <br/>
1) <br/>
Caused by: java.lang.NullPointerException: null<br/>
at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:148) ~<span class="error">[hibernate-core-4.1.7.Final.jar!/:4.1.7.Final]</span><br/>
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:88) ~<span class="error">[hibernate-core-4.1.7.Final.jar!/:4.1.7.Final]</span><br/>
at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:58) ~<span class="error">[hibernate-core-4.1.7.Final.jar!/:4.1.7.Final]</span><br/>
at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1182) ~<span class="error">[hibernate-core-4.1.7.Final.jar!/:4.1.7.Final]</span><br/>
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1237) ~<span class="error">[hibernate-core-4.1.7.Final.jar!/:4.1.7.Final]</span><br/>
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101) ~<span class="error">[hibernate-core-4.1.7.Final.jar!/:4.1.7.Final]</span><br/>
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:257) ~<span class="error">[hibernate-entitymanager-4.1.7.Final.jar!/:4.1.7.Final]</span></p>
<p>2) <br/>
Caused by: java.lang.NullPointerException<br/>
at org.hibernate.event.internal.AbstractLockUpgradeEventListener.upgradeLock(AbstractLockUpgradeEventListener.java:61) <span class="error">[hibernate-core-4.1.7.Final.jar:4.1.7.Final]</span><br/>
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromSessionCache(DefaultLoadEventListener.java:512) <span class="error">[hibernate-core-4.1.7.Final.jar:4.1.7.Final]</span><br/>
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:404) <span class="error">[hibernate-core-4.1.7.Final.jar:4.1.7.Final]</span><br/>
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:204) <span class="error">[hibernate-core-4.1.7.Final.jar:4.1.7.Final]</span><br/>
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:143) <span class="error">[hibernate-core-4.1.7.Final.jar:4.1.7.Final]</span></p></div>
<div style="color:#505050;padding:4px 0 0 0;"> </div>
</td>
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</table>
</td>
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</table>
</td>
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</table>
</td><!-- End #email-page -->
</tr>
<tr valign="top">
<td style="color:#505050;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:10px;line-height:14px;padding: 0 16px 16px 16px;text-align:center;">
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</td>
</tr>
</table><!-- End #email-wrap -->
</div><!-- End #email-body -->