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From "Michael Dick (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-1642) ClassCastException caused when using property 'openjpa.Sequence'
Date Fri, 30 Apr 2010 19:26:53 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862821#action_12862821
] 

Michael Dick commented on OPENJPA-1642:
---------------------------------------

Pinaki's suggestion to enhance at build time (http://openjpa.208410.n2.nabble.com/DataSource-initialization-error-tt4958860.html#a4980529)
should work around the problem. It's not very obvious why that's required. 

The problem is that the PCAgentEnhancer (javaagent) is creates and initializes a new instance
of OpenJPAConfigurationImpl, but the Sequence plugin you're using requires a JDBCConfigurationImpl.
It's the initialization that causes the problem - we're initializing a plugin that requires
more information than we have (e.g. JDBC knowledge). 

Fixing it might be interesting - I'd be tempted to lazily initialize instead of eagerly creating
all the plugins. This might break other things though - the code indicates that there once
was a threading issue. Failing that we'd have to make OpenJPAConfigurationImpl more fault
tolerant which could get a bit thorny too. 

At any rate, please do try enhancing at build time. A good reference can be found here : http://webspherepersistence.blogspot.com/2009/02/openjpa-enhancement.html






> ClassCastException caused when using property 'openjpa.Sequence'
> ----------------------------------------------------------------
>
>                 Key: OPENJPA-1642
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1642
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 1.0.3, 1.2.2, 2.0.0
>            Reporter: Heath Thomann
>            Assignee: Heath Thomann
>
> When setting the following property:
> <property name="openjpa.Sequence"
> value="org.apache.openjpa.jdbc.kernel.ClassTableJDBCSeq()"/>
> the following exception is caused:
> java.lang.ClassCastException:
> org.apache.openjpa.conf.OpenJPAConfigurationImpl cannot be cast to
> org.apache.openjpa.jdbc.conf.JDBCConfiguration
> The same exception is caused when using other sequence generators, for example 'org.apache.openjpa.jdbc.kernel.TableJDBCSeq'.

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