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https://issues.apache.org/jira/browse/GERONIMO-5553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902990#action_12902990
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Kevan Miller commented on GERONIMO-5553:
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Pre-compilation or special persistence.xml properties should not be required in 
this case. This sounds like a Geronimo problem which needs to be fixed. If 
Book.class is not being dynamically enhanced, then seems like something needs 
to be changed within Geronimo so that enhancement occurs.

> Fail to enchance entities on Geronimo
> -------------------------------------
>
>                 Key: GERONIMO-5553
>                 URL: https://issues.apache.org/jira/browse/GERONIMO-5553
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>          Components: persistence
>    Affects Versions: 3.0
>         Environment: OS:win xp
> Geronimo :3.0 20100824 build
>            Reporter: Lu Jiang
>            Assignee: Donald Woods
>             Fix For: 3.0
>
>         Attachments: booknew.war
>
>
> I tried to deploy a simple jpa sample on geronimo.But when persist data into 
> database.
> Following exception will occur.
> <openjpa-2.0.0-r422266:935683 nonfatal user error> 
> org.apache.openjpa.persistence.ArgumentException: Attempt to cast instance 
> "org.apache.sample.entities.b...@97781f" to PersistenceCapable failed.  
> Ensure that it has been enhanced.
> FailedObject: org.apache.sample.entities.b...@97781f

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