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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/JPA" style="color: #3b73af; text-decoration: none">Java Persistence API</a> / <a href="https://hibernate.atlassian.net/browse/JPA-76" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-6f4e2827-0c4f-41ab-9e21-51bcecbadc3b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/JPA-76" style="color: #3b73af; text-decoration: none">JPA-76</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/JPA-76" style="color: #3b73af; text-decoration: none">NullPointerException in StatefulPersistenceContext.clear</a> </span> </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">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-6f4e2827-0c4f-41ab-9e21-51bcecbadc3b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<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">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 05/Mar/2016 23:23 PM </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">Environment:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> JPA 2.1 <br> hibernate-commons-annotations 4.0.5 <br> hibernate-core 4.3.8 <br> postgres 9.4 </td>
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<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-minor-a23bab35-f75a-42b8-aab0-67dc7c32c0d5" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </td>
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<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="meytalG" id="email_meytalG" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=meytalG" style="color:#6c797f;; color: #3b73af; text-decoration: none">Meytal</a> </td>
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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">In our application we use EntityManager.Clear in a method annotated with @transactional although we know it's not best practice ( we'll remove the call to clear()).</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">when performing the same operation in large scale (the operation is done on single element and not in a robust way), we get NullPointerException.<br> stack trace:</p>
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<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">
java.lang.NullPointerException
at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:237) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.internal.SessionImpl.internalClear(SessionImpl.java:340) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.internal.SessionImpl.clear(SessionImpl.java:336) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.clear(AbstractEntityManagerImpl.java:1419) ~[hibernate-entitymanager-4.3.8.Final.jar:4.3.8.Final]
at sun.reflect.GeneratedMethodAccessor178.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_60]
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:344) ~[spring-orm-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at com.sun.proxy.$Proxy79.clear(Unknown Source) ~[?:?]
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">the stack trace show that the the source of the call is our call to entityManager.clear().</p> </td>
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