code: public static boolean exists(File file) {
          try {
              boolean fileExists = file.exists();
              if(!forceCaseSensitive || !fileExists) {
                  return fileExists;
              }
  
              String absPath = canonicalize(file.getAbsolutePath());
              String canPath = canonicalize(file.getCanonicalPath());
              return fileExists && absPath.equals(canPath);
          } catch(IOException io) {
              return false;
          }
      }
docs: In case the file system is not case sensitive we compare the canonical path with
  the absolute path of the file after normalized.
  @param file
  @return