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                                    <td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 8px" width="32"> <img id="header-avatar-image" class="image_fix" src="cid:jira-generated-image-avatar-3ead22f0-4864-4d39-9ef7-fe63be6ba64a" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top"> </td> 
                                    <td id="header-text-container" valign="middle" style="padding: 0px; border-collapse: collapse; vertical-align: middle; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px"> <a class="user-hover" rel="gabor.varga" id="email_gabor.varga" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gabor.varga" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gábor Varga</a> <strong>created</strong> an issue </td> 
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                    <td id="email-content-container" style="padding: 0px; border-collapse: collapse; padding: 0 20px"> 
                        <table id="email-content-table" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; border-spacing: 0; border-collapse: separate"> 
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                                    <!-- there needs to be content in the cell for it to render in some clients --> 
                                    <td class="email-content-rounded-top mobile-expand" style="padding: 0px; border-collapse: collapse; color: #ffffff; padding: 0 15px 0 16px; height: 15px; background-color: #ffffff; border-left: 1px solid #cccccc; border-top: 1px solid #cccccc; border-right: 1px solid #cccccc; border-bottom: 0; border-top-right-radius: 5px; border-top-left-radius: 5px; height: 10px; line-height: 10px; padding: 0 15px 0 16px; mso-line-height-rule: exactly" height="10" bgcolor="#ffffff">&nbsp;</td> 
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                                        <table class="page-title-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt"> 
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                                                    <td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10562" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-2d68f557-acbb-4292-957e-a86a6638ebbf" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10562" style="color: #3b73af; text-decoration: none">HHH-10562</a> </td> 
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                                                    <td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-10562" style="color: #3b73af; text-decoration: none">ManagedEntity linked list broken when lazy loading enabled: previous and next are null</a> </span> </td> 
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                                    <td class="email-content-main mobile-expand  wrapper-special-margin" style="padding: 0px; border-collapse: collapse; border-left: 1px solid #cccccc; border-right: 1px solid #cccccc; border-top: 0; border-bottom: 0; padding: 0 15px 0 16px; background-color: #ffffff; padding-top: 10px; padding-bottom: 5px" bgcolor="#ffffff"> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th> 
                                                    <td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-2d68f557-acbb-4292-957e-a86a6638ebbf" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th> 
                                                    <td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.0.8, 5.1.0 </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th> 
                                                    <td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th> 
                                                    <td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th> 
                                                    <td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 24/Feb/2016 08:53 AM </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Labels:</th> 
                                                    <td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> lazy </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th> 
                                                    <td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-e20c4b3c-6d36-4146-a5cd-fedaff7b1bb2" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th> 
                                                    <td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="gabor.varga" id="email_gabor.varga" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gabor.varga" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gábor Varga</a> </td> 
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                                    <td class="email-content-main mobile-expand  issue-description-container" style="padding: 0px; border-collapse: collapse; border-left: 1px solid #cccccc; border-right: 1px solid #cccccc; border-top: 0; border-bottom: 0; padding: 0 15px 0 16px; background-color: #ffffff; padding-top: 5px; padding-bottom: 10px" bgcolor="#ffffff"> 
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                                                    <td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">I have encountered <tt>NullPointerException</tt> exceptions coming from Hibernate's internals:</p> 
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java.lang.NullPointerException
at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:138)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:74)
at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:44)
at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1264)
</pre> 
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                                                                <pre class="code-none" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
java.lang.NullPointerException
at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:226)
at org.hibernate.internal.SessionImpl.cleanup(SessionImpl.java:566)
at org.hibernate.internal.SessionImpl.close(SessionImpl.java:438)
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I was doing something like the following in a (stateful) <tt>Session</tt>:</p> 
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                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">final</span> Set&lt;<span class="code-object" style="color: #910091">Object</span>&gt; children = parent.getChildren();
<span class="code-keyword" style="color: #000091">final</span> Set&lt;<span class="code-object" style="color: #910091">Object</span>&gt; childrenCopy = <span class="code-keyword" style="color: #000091">new</span> HashSet&lt;&gt;(children);
<span class="code-keyword" style="color: #000091">for</span> (<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">Object</span> child : children) {
    children.remove(child);
    session.delete(child);
}
session.flush();
<span class="code-keyword" style="color: #000091">for</span> (<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">Object</span> child : childrenCopy) {
    session.evict(child);
}
session.commit();
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Lazy attribute loading is enabled with the following <tt>hibernate-enhance-maven-plugin</tt> parameters, but the involved <tt>@OneToMany</tt> relation doesn't have to be <tt>FetchType.LAZY</tt>.</p> 
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                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-xml" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-tag" style="color: #000091">&lt;configuration&gt;</span>
  <span class="code-tag" style="color: #000091">&lt;enableLazyInitialization&gt;</span>true<span class="code-tag" style="color: #000091">&lt;/enableLazyInitialization&gt;</span>
  <span class="code-tag" style="color: #000091">&lt;enableDirtyTracking&gt;</span>false<span class="code-tag" style="color: #000091">&lt;/enableDirtyTracking&gt;</span>
  <span class="code-tag" style="color: #000091">&lt;enableAssociationManagement&gt;</span>false<span class="code-tag" style="color: #000091">&lt;/enableAssociationManagement&gt;</span>
  <span class="code-tag" style="color: #000091">&lt;enableExtendedEnhancement&gt;</span>false<span class="code-tag" style="color: #000091">&lt;/enableExtendedEnhancement&gt;</span>
<span class="code-tag" style="color: #000091">&lt;/configuration&gt;</span>
</pre> 
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                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Removing the <tt>evict()</tt> call resolves the issue.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Both places where the exception occured was calling <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/StatefulPersistenceContext.java#L1121" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>StatefulPersistenceContext.reentrantSafeEntityEntries()</tt></a> internally, which returns an array by calling <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L243" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>EntityEntryContext.reentrantSafeEntityEntries()</tt></a>. After evicting an entity, this array contained <em>only</em> <tt>null</tt> values (instead of <tt>EntityEntryContext.EntityEntryCrossRefImpl</tt> instances), and calling <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/event/internal/AbstractFlushingEventListener.java#L138" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>Map.Entry.getValue()</tt></a> or <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/StatefulPersistenceContext.java#L226" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>Map.Entry.getKey()</tt></a> on these <tt>null</tt> values resulted in the <tt>NullPointerException</tt> errors.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">By looking at the source code of <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L243" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>EntityEntryContext.reentrantSafeEntityEntries()</tt></a>, I can see that it creates a new array of size <tt>count</tt>, and fills the items of this new array by walking the <tt>ManagedEntity</tt> linked list from <tt>head</tt> by calling <tt>$$_hibernate_getNextManagedEntity()</tt>. However, <tt>count</tt> is non-zero and <tt>head</tt> is null here, so we get an array of <tt>count</tt> <tt>null</tt> values.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">And by debugging <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultEvictEventListener.java#L46" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>DefaultEvictEventListener.onEvict()</tt></a>, I could see that it reaches <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultEvictEventListener.java#L89" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">line 89</a> without throwing an (ignored) exception there. (The <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultEvictEventListener.java#L101" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>doEvict()</tt></a> method is <em>not</em> called in this code path.) Only the <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/StatefulPersistenceContext.java#L437" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>StatefulPersistenceContext.removeEntry()</tt></a> method is called, which in turn calls <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L168" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>EntityEntryContext.removeEntityEntry()</tt></a>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Debugging this <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L168" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>EntityEntryContext.removeEntityEntry()</tt></a> method shows that the argument is an instance of <tt>ManagedEntity</tt> in <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L174" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">line 174</a> (because of the bytecode enhancement), but in lines <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L189" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">189</a> and <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L190" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">190</a>, its <tt>$$_hibernate_getPreviousManagedEntity()</tt> and <tt>$$_hibernate_getNextManagedEntity()</tt> methods return <tt>null</tt> (its bytecode enhanced <tt>$$_hibernate_previousManagedEntity</tt> and <tt>$$_hibernate_nextManagedEntity</tt> fields were also <tt>null</tt> upon inspection). So in lines <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L210" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">210</a> and <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L219" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">219</a>, the <tt>head</tt> and <tt>tail</tt> variables are set to <tt>null</tt> (the <tt>assert</tt> operations would also fail). So in the subsequent call of <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.0/hibernate-core/src/main/java/org/hibernate/engine/internal/EntityEntryContext.java#L243" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>reentrantSafeEntityEntries()</tt></a> runs with a <tt>null</tt> <tt>head</tt> and non-zero <tt>count</tt>, causing the <tt>NullPointerException</tt> errors.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I couldn't figure out why this child entity had <tt>null</tt> values for the <tt>$$_hibernate_previousManagedEntity</tt>, <tt>$$_hibernate_nextManagedEntity</tt> and <tt>$$_hibernate_entityEntryHolder</tt> fields, but this might be the cause of the exceptions. Other managed entities of the session (including the parent entity) had non-null values.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Setting the <tt>enableLazyInitialization</tt> parameter of the <tt>hibernate-enhance-maven-plugin</tt> to <tt>false</tt> also resolves the problem.</p> </td> 
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