[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2218) java.util.ConcurrentModificationException at org.hibernate.pretty.Printer.toString(Printer.java:90)

[Max Rydahl Andersen (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2218?page=comments#action_25188 ] 

Max Rydahl Andersen commented on HHH-2218:
------------------------------------------

so as probably have been mentioned on those cases and forum postings this occurs because the session have been changed while the printing occurs.

That can happen for three reasons:

1) concurrent access from another thread

2) a bug in the printing that somehow causes initialization of properties (or you as the user in methods that should not access the session)

You will need to present a *minimal* test case that shows this is a bug in hibernate.

> java.util.ConcurrentModificationException at org.hibernate.pretty.Printer.toString(Printer.java:90)
> ---------------------------------------------------------------------------------------------------
>
>          Key: HHH-2218
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2218
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.1.3
>  Environment: Hibernate 3.1.3, spring 2.1.8 on Jboss 4.0.2 with Oracle 10g 
>     Reporter: rm

>
>
> Similar issues have been logged since May 2005 and have been marked as 'Fixed' by Gavin especially for Session.toString() related cases. However, I am also facing similar issues in Printer.toString()...
> The saving grace is that when I set the debug level to INFO, the problem goes away...
> Am copy/pasting the relevent stacktrace...I have also debugged this on eclipse and the exact location is the call to "new Printer(....)" in AbstractFlushingEventListener.java
> java.util.ConcurrentModificationException
> 10:07:28,421 INFO  [STDOUT] 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
> 10:07:28,421 INFO  [STDOUT] 	at java.util.HashMap$ValueIterator.next(HashMap.java:817)
> 10:07:28,421 INFO  [STDOUT] 	at org.hibernate.pretty.Printer.toString(Printer.java:90)
> 10:07:28,421 INFO  [STDOUT] 	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:97)
> 10:07:28,421 INFO  [STDOUT] 	at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:35)
> 10:07:28,421 INFO  [STDOUT] 	at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:954)
> 10:07:28,421 INFO  [STDOUT] 	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1099)
> 10:07:28,421 INFO  [STDOUT] 	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
> PS: This is my first attempt at logging issues at JIRA. Kindly point out any deficiencies or irregularities in this attempt.

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