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https://issues.apache.org/jira/browse/APEXMALHAR-2312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611295#comment-15611295
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Deepak Narkhede commented on APEXMALHAR-2312:
---------------------------------------------
Changed to Critical because some basic functionality is broken.
> NullPointerException in FileSplitterInput only if the file path is specified
> for attribute <files> instead of directory path
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: APEXMALHAR-2312
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2312
> Project: Apache Apex Malhar
> Issue Type: Bug
> Reporter: Deepak Narkhede
> Assignee: Deepak Narkhede
> Priority: Critical
>
> Problem Statement:
> ==================
> NullPointerException seen in FileSplitterInput only if the file path is
> specified for attribute <files> instead of directory path.
> Description:
> ===========
> 1) TimeBasedDirectoryScanner threads part of scanservice tries to scan the
> directories/files.
> 2) Each thread checks with help of isIterationCompleted() [referenceTimes]
> method whether scanned of last iteration are processed by operator thread.
> 3) Previously it used to work because HashMap (referenceTimes) used to return
> null even if last scanned directory path is null.
> 4) Recently referenceTimes is changed to ConcurrentHashMap, so get() doesn't
> allow null key's passed to ConcurrentHashMap get() method.
> 5) Hence NullPointerException is seen as if only file path is provided
> directory path would be empty hence key would be empty.
> Solution:
> ========
> Pre-check that directory path is null then we have completed last iterations
> if only filepath is provided.
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