[infinispan-issues] [JBoss JIRA] (ISPN-1914) Add hints for when File.listFiles() returns null

[Galder Zamarreño (JIRA)]

Galder Zamarreño created ISPN-1914:
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             Summary: Add hints for when File.listFiles() returns null
                 Key: ISPN-1914
                 URL: https://issues.jboss.org/browse/ISPN-1914
             Project: Infinispan
          Issue Type: Enhancement
          Components: Loaders and Stores
    Affects Versions: 5.1.2.FINAL
            Reporter: Galder Zamarreño
            Assignee: Galder Zamarreño
             Fix For: 5.1.x, 5.2.0.ALPHA1, 5.2.0.FINAL


Under some circumstances, File.listFiles() can return null as shown by AS7-3808:

{code}
@return  An array of abstract pathnames denoting the files and
         directories in the directory denoted by this abstract
         pathname.  The array will be empty if the directory is
         empty.  Returns <code>null</code> if this abstract pathname
         does not denote a directory, or if an I/O error occurs.
{code}

In order to get more information, if listFiles() returns null, add some checks to see if File.exists() and if File.isDirectory(). This might give us more of a clue of what happened. Also, although not likely, it might be worth to check permissions via File.canRead() and File.canWrite() too.

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