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https://issues.apache.org/jira/browse/HADOOP-8750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bo Wang resolved HADOOP-8750.
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Resolution: Duplicate
Duplicated with HADOOP-7851
> Configuration.getClasses never returns default value
> ----------------------------------------------------
>
> Key: HADOOP-8750
> URL: https://issues.apache.org/jira/browse/HADOOP-8750
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Bo Wang
> Assignee: Bo Wang
>
> getClasses method in Configuration never returns defaultValue even if the
> classnames is not set in Configuration.
> This is because the condition "if (classnames == null)" is always True. If
> name is not set in Configuration, classnames will be an empty array (but not
> null).
> To fix it, just change the condition to "if (classnames == null ||
> classnames.length == 0)"
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