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<img id="email-avatar" src="https://hibernate.onjira.com/secure/useravatar?ownerId=gsmet&avatarId=10640" 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="gsmet" id="email_gsmet" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=gsmet" style="color:#6c797f;">Guillaume Smet</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-7821'>HHH-7821</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7821'><strong>2 different NPEs after upgrade from 4.1.6 to 4.1.8</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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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
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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core </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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22/Nov/12 9:38 AM
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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;'>From my post on the mailing list:</p>
<p style='margin-top:0;margin-bottom:10px;'>Hi,</p>
<p style='margin-top:0;margin-bottom:10px;'>After upgrading from <b>4.1.6</b> to <b>4.1.8</b>, we have a couple of regressions<br/>
in one of our applications.</p>
<p style='margin-top:0;margin-bottom:10px;'>We tried to obtain self contained test cases and understand what the<br/>
problem is but it's quite hard to reproduce and we haven't found a way<br/>
to isolate the problem yet.</p>
<p style='margin-top:0;margin-bottom:10px;'>Anyway, I was wondering if the stacktraces could ring a bell for<br/>
someone to help us analyze the problem. It might even be an obvious<br/>
bug for you once you have the stracktrace.</p>
<p style='margin-top:0;margin-bottom:10px;'>Here are both stacktraces for the regressions we have:</p>
<p style='margin-top:0;margin-bottom:10px;'>Stacktrace 1 (only when we configure the batch loading - might be due<br/>
to a race condition because it's not systematic):</p>
<p style='margin-top:0;margin-bottom:10px;'>Caused by: java.lang.NullPointerException<br/>
at<br/>
org.hibernate.type.descriptor.java.AbstractTypeDescriptor.extractHashCode(AbstractTypeDescriptor.java:88)<br/>
at<br/>
org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:210)<br/>
at<br/>
org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:214)<br/>
at org.hibernate.cache.spi.CacheKey.calculateHashCode(CacheKey.java:71)<br/>
at org.hibernate.cache.spi.CacheKey.<init>(CacheKey.java:67)<br/>
at<br/>
org.hibernate.internal.AbstractSessionImpl.generateCacheKey(AbstractSessionImpl.java:252)<br/>
at<br/>
org.hibernate.engine.spi.BatchFetchQueue.isCached(BatchFetchQueue.java:330)<br/>
at<br/>
org.hibernate.engine.spi.BatchFetchQueue.getCollectionBatch(BatchFetchQueue.java:312)<br/>
at<br/>
org.hibernate.loader.collection.BatchingCollectionInitializer.initialize(BatchingCollectionInitializer.java:72)<br/>
at<br/>
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:678)<br/>
at<br/>
org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:80)<br/>
at<br/>
org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1804)<br/>
at<br/>
org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:549)<br/>
at<br/>
org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:234)<br/>
at<br/>
org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:545)<br/>
at<br/>
org.hibernate.collection.internal.PersistentBag.removeAll(PersistentBag.java:345)</p>
<p style='margin-top:0;margin-bottom:10px;'>Stacktrace 2 (we have this one even if we disable the batch loading):</p>
<p style='margin-top:0;margin-bottom:10px;'>Caused by: java.lang.NullPointerException<br/>
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:259)<br/>
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)<br/>
at<br/>
org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:160)<br/>
at<br/>
org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:151)<br/>
at<br/>
org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:88)<br/>
at<br/>
org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)<br/>
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1213)<br/>
at<br/>
org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986)<br/>
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br/>
at<br/>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<br/>
at<br/>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>
at java.lang.reflect.Method.invoke(Method.java:597)<br/>
at<br/>
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)<br/>
at $Proxy115.flush(Unknown Source)</p>
<p style='margin-top:0;margin-bottom:10px;'>Followup of this post:<br/>
The errors are quite hard to reproduce and we only have them in a <b>big</b> application with a lot of entities when we are bulk loading a lot of objects. We don't reproduce these problems on the smaller ones. That's why a self contained test case is hard to get.</p>
<p style='margin-top:0;margin-bottom:10px;'>They are totally reproducable on this application though.</p>
<p style='margin-top:0;margin-bottom:10px;'>From what we saw in the code, at least one of the stacktraces comes from a place modified in 4.1.8. That's why we hoped it could ring a bell just to have the stacktraces.</p>
<p style='margin-top:0;margin-bottom:10px;'>Typically this one:<br/>
Caused by: java.lang.NullPointerException<br/>
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:259)<br/>
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)<br/>
at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:160)<br/>
at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:151)<br/>
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:88)<br/>
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)<br/>
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1213)<br/>
at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986) </p>
<p style='margin-top:0;margin-bottom:10px;'>seems to be related to this particular commit:<br/>
<a href="https://github.com/hibernate/hibernate-orm/commit/deaff9705e564b33b92b3eac9fdee89815ce1a44">https://github.com/hibernate/hibernate-orm/commit/deaff9705e564b33b92b3eac9fdee89815ce1a44</a></p>
<p style='margin-top:0;margin-bottom:10px;'>Should we try to reproduce it in a debug environment with a conditional breakpoint to see if we can have more information about the context?</p>
<p style='margin-top:0;margin-bottom:10px;'>For the other one, I don't have any idea yet.</p>
<p style='margin-top:0;margin-bottom:10px;'>In this commit, I find a little weird that the hashCode is tested before testing the type but I don't think it might be related to the problem at hand.<br/>
<a href="https://github.com/hibernate/hibernate-orm/commit/fae0d3f49877a5a11a7ac5cef25bb91235906fab">https://github.com/hibernate/hibernate-orm/commit/fae0d3f49877a5a11a7ac5cef25bb91235906fab</a></p>
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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 4.1.8, PostgreSQL 9.1
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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;">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="gsmet" id="email_gsmet" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=gsmet" style="color:#6c797f;">Guillaume Smet</a>
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