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https://issues.apache.org/jira/browse/HADOOP-12654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062640#comment-15062640
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Steve Loughran commented on HADOOP-12654:
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you are free to submit a patch...
> Add JavaDoc to FileSystem constructors
> --------------------------------------
>
> Key: HADOOP-12654
> URL: https://issues.apache.org/jira/browse/HADOOP-12654
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 2.7.1
> Reporter: Dénes Harmath
> Priority: Minor
>
> After calling the FileSystem constructor, the instance is not initialized
> yet, but FileSystem#initialize has to be called, otherwise an NPE is thrown
> when using the instance. The constructor should create a valid instance
> instead.
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