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

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: 5.1.3.CR1, 5.1.3.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.