[jira] [Commented] (METAMODEL-1190) ClassCastException when getting value from DB

["Martin Hák (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/METAMODEL-1190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642841#comment-16642841 ] 

Martin Hák commented on METAMODEL-1190:
---------------------------------------

whe would be possible to calcute with fix,pls?

> ClassCastException when getting value from DB
> ---------------------------------------------
>
>                 Key: METAMODEL-1190
>                 URL: https://issues.apache.org/jira/browse/METAMODEL-1190
>             Project: Apache MetaModel
>          Issue Type: Bug
>    Affects Versions: 5.0.0
>            Reporter: Petr Knápek
>            Priority: Major
>         Attachments: metamodel-bug.zip
>
>
> We use MetaModel with Postgres/MsSQL in our project and when system processes many data and queries DB tables in parallel then queuries suddenly fails with exception like this
> 'java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Boolean'.
> This exception is thrown when org.apache.metamodel.data.Row.getValue(Column) is executed and result is to be saved to variable. The problem occurs time and again.
> It looks like that AbstractRow.getIndex(Column) which is invoked in getValue(Column) returns wrong column index and that's why value of another column is get.
> I think the cause of problem is in org.apache.metamodel.data.CachingDataSetHeader.indexOf(Column) which uses System.identityHashCode(Object) for generating keys. This method can return the same values for different objects.
> Attached is testing class which reproduces problem.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)