[jira] [Created] (FLINK-8473) JarListHandler may fail with NPE if directory is deleted

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-8473:
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             Summary: 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
             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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