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https://issues.apache.org/jira/browse/SOLR-1408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751293#action_12751293
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Noble Paul commented on SOLR-1408:
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I suspect that this should not be a problem . DataSource.class is loaded by the
parent classloader of ${solr.home}/lib classloader. So by design it is not
supposed to throw a ClassCastException
> Allow classes from ${solr.home}/lib to be loaded by the same classloader as
> solr war to prevent ClassCastException
> ------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-1408
> URL: https://issues.apache.org/jira/browse/SOLR-1408
> Project: Solr
> Issue Type: Improvement
> Components: contrib - DataImportHandler
> Affects Versions: 1.3
> Reporter: Luke Forehand
>
> When extending org.apache.solr.handler.dataimport.DataSource, I would like to
> package my extended class in ${solr.home}/lib to that I can keep the vanilla
> copy of my solr.war intact. The problem is I encounter a ClassCastException
> when Solr tries to create a newInstance of my extended class, which I suspect
> has to do with the DataSource and my extended class being loaded from
> different classloaders.
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