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From "Heiko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-398) ConcurrentModificationException at org.apache.openjpa.kernel.BrokerImpl
Date Sun, 28 Sep 2008 20:28:44 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635260#action_12635260
] 

Heiko commented on OPENJPA-398:
-------------------------------

Hi!

I see exactly the same behaviour as described in this bug on 1.2.0.

And yes, in my case, there is a reference to an object of the same class. It's a tree of objects.
Each object has a @ManyToOne relationship to its parent and a @OneToMany relationship to its
children. Parents and children are objects of the same class.
This exception appears, when I try to add a child to the tree (add-operation on the java.util.List
of children). 

The exception doesn't occur in the first or second level of the hierarchy, only on deeper
levels. 
To test, wether concurrency is involved or not, I set openjpa.Multithreaded to true, but I
got the same exception.
Apart from that, I'm pretty sure, that there is only one thread. 

Using plain JPA in a Swing application (no Spring,...). 

I can make a short example, if it is of interest for you.


> ConcurrentModificationException at org.apache.openjpa.kernel.BrokerImpl
> -----------------------------------------------------------------------
>
>                 Key: OPENJPA-398
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-398
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 1.0.0, 1.0.1, 1.0.2, 1.1.0
>            Reporter: Alexander
>            Priority: Critical
>
> Hello.
>  
> I'm trying to use OpenJPA in my project. I use Liferay based on Toncat as front-end.
> I use OpenJPA 1.0.0
> Today I have got strange exception - 
> 10:35:55,785 ERROR ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
 at java.util.HashMap$KeyIterator.next(HashMap.java:823) at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.dirtyCheck(BrokerImpl.java:4612)
>         at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.access$000(BrokerImpl.java:4352)
at org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:3731)
>         at org.apache.openjpa.kernel.BrokerImpl.setDirty(BrokerImpl.java:3848) at org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:207)
>         at org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1532)
at org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1471)
>         at org.apache.openjpa.kernel.StateManagerImpl.dirtyCheck(StateManagerImpl.java:808)
at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.dirtyCheck(BrokerImpl.java:4612)
>         at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.access$000(BrokerImpl.java:4352)
at org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:3731)
>         at org.apache.openjpa.kernel.BrokerImpl.setDirty(BrokerImpl.java:3848) at org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:207)
>         at org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1532)
at org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1471)
>         at org.apache.openjpa.kernel.StateManagerImpl.dirtyCheck(StateManagerImpl.java:808)
at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.dirtyCheck(BrokerImpl.java:4612)
>         at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.access$000(BrokerImpl.java:4352)
>  
> It happens only, when I deploy application on portal, and only when service is first-time
accessed.
> All tests work fine.
>  
> Exception throws in get method
> Transactions are managed by Spring and i use Spring agent.

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