AbstractPersistentCollection throws NullPointerException in highly concurrent situation --------------------------------------------------------------------------------------- Key: HHH-6458 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6458 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.1 Environment: Websphere + AIX + DB2 9.7.4 Reporter: Yiming Du Lately when doing stress test, a NullPointerException was sometimes being thrown within Hibernate class AbstractPersistentCollection. The excpetion happened only in highly concurrent situation. We're using Websphere, here's the stack trace in Webshpere's log. [7/19/11 12:31:59:679 EDT] 00000039 SystemErr R java.lang.NullPointerException [7/19/11 12:31:59:680 EDT] 00000039 SystemErr R at org.hibernate.collection.AbstractPersistentCollection.isConnectedToSession(AbstractPersistentCollection.java:196) [7/19/11 12:31:59:680 EDT] 00000039 SystemErr R at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:429) [7/19/11 12:31:59:681 EDT] 00000039 SystemErr R at org.hibernate.event.def.OnLockVisitor.processCollection(OnLockVisitor.java:61) [7/19/11 12:31:59:681 EDT] 00000039 SystemErr R at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:124) [7/19/11 12:31:59:681 EDT] 00000039 SystemErr R at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:84) [7/19/11 12:31:59:681 EDT] 00000039 SystemErr R at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:78) [7/19/11 12:31:59:681 EDT] 00000039 SystemErr R at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:146) [7/19/11 12:31:59:681 EDT] 00000039 SystemErr R at org.hibernate.event.def.AbstractReassociateEventListener.reassociate(AbstractReassociateEventListener.java:102) [7/19/11 12:31:59:682 EDT] 00000039 SystemErr R at org.hibernate.event.def.DefaultLockEventListener.onLock(DefaultLockEventListener.java:82) [7/19/11 12:31:59:682 EDT] 00000039 SystemErr R at org.hibernate.impl.SessionImpl.fireLock(SessionImpl.java:611) [7/19/11 12:31:59:682 EDT] 00000039 SystemErr R at org.hibernate.impl.SessionImpl.lock(SessionImpl.java:603) [7/19/11 12:31:59:682 EDT] 00000039 SystemErr R at com.silanis.idmgr.request.ConfigurationCache.shouldRefresh(ConfigurationCache.java:99) [7/19/11 12:31:59:682 EDT] 00000039 SystemErr R at com.silanis.idmgr.request.ConfigurationCache.getConfiguration(ConfigurationCache.java:59) Further investigation revealed the line of code in our application that caused the exception: session.lock( config, LockMode.READ); It's certain that neither session nor config object is null when the call is made. config is a persistent object which has associations and collections of other entity instances. We use lock function to perform a version check. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira