title: Java File.isDirectory() returns False for a Directory in Linux
body: <p>Please see code snippet:</p>
  
  <pre><code>File[] additionalFiles = new File(FILE_PATH).listFiles();
  boolean isDirectory = file.isDirectory();
  </code></pre>
  
  <p>I have verified that the directory path is correct, and when I run the code on Windows, the value of isDirectory is true (as it should be).  Any suggestions as to why this occurs on Linux (RedHat Enterprise Linux)?</p>