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https://issues.apache.org/jira/browse/JCR-2908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003265#comment-13003265
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codeparser commented on JCR-2908:
---------------------------------

it only occurs within transaction.
it is ok to execute the same process without transaction.
Is version manager able to handle the transaction case? 

> deadbeef-face-babe-cafe-babecafebabe has been modified externally
> -----------------------------------------------------------------
>
>                 Key: JCR-2908
>                 URL: https://issues.apache.org/jira/browse/JCR-2908
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: transactions, versioning
>    Affects Versions: 2.2.0
>         Environment: JDK1.6
> WIN XP
>            Reporter: codeparser
>
> The use case is as follows:
> 1. create two node named "folder1" and "folder2"
> 2. create one thread which create twenty versionable nodes under folder1 
> within a transaction.
> 3. create another thread which create twenty versionable nodes under folder2 
> within a transaction.
> 4. repeat step 2 and step3 and then it will throw below Exception:
> Caused by: org.apache.jackrabbit.core.state.StaleItemStateException: 
> deadbeef-face-babe-cafe-babecafebabe has been modified externally
>       at 
> org.apache.jackrabbit.core.state.SharedItemStateManager$Update.begin(SharedItemStateManager.java:663)
>       at 
> org.apache.jackrabbit.core.state.SharedItemStateManager.beginUpdate(SharedItemStateManager.java:1457)
>       at 
> org.apache.jackrabbit.core.state.XAItemStateManager.prepare(XAItemStateManager.java:163)
>       ... 11 more

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