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https://issues.apache.org/jira/browse/FLINK-8473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16337450#comment-16337450
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Chesnay Schepler commented on FLINK-8473:
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master: 8fdea6093a55c33732ae869b82552371b8142c2a
> JarListHandler may fail with NPE if directory is deleted
> --------------------------------------------------------
>
> Key: FLINK-8473
> URL: https://issues.apache.org/jira/browse/FLINK-8473
> Project: Flink
> Issue Type: Improvement
> Components: Webfrontend
> Affects Versions: 1.4.0, 1.5.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Major
> Fix For: 1.5.0, 1.4.1
>
>
> The JarListHandler is responsible for listing all jars that have been
> uploaded via the webUI. Uploaded jars are stored in a temporary directory,
> and the handler simply iterates over the contents of this directory to create
> the listing.
>
> {code:java}
> File[] list = jarDir.listFiles(new FilenameFilter() {
> @Override
> public boolean accept(File dir, String name) {
> return name.endsWith(".jar");
> }
> });
> // last modified ascending order
> Arrays.sort(list, (f1, f2) -> Long.compare(f2.lastModified(),
> f1.lastModified()));{code}
> This code will fail with a {{NullPointerException}} if the directory was
> deleted (like as part of some automatic cleanup). File#listFiles returns null
> in this case causing Arrays.sort to throw the NPE.
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