Consuming an increasing file with Java

Hello,

here is some simple static method that behaves like Linux/Unix 'tail -f <some_filename>'.

Sleep period is hardcoded to 3000ms and the payload i.e. what the method is doing with the file content is simply println() to stdout.

BR,

Roland

 12     public static void tail(String fname)
 13         throws InterruptedException, IOException, FileNotFoundException, InterruptedException
 14     {
 15         RandomAccessFile f = new RandomAccessFile( fname, "r" );
 16         long posInFile = 0;
 17 
 18         while (true) {
 19             long fileLength = f.length();
 20             if (fileLength > posInFile) {
 21                 f.seek(posInFile);
 22                 String line = f.readLine();
 23                 while( line != null ) {
 24                     System.out.println(line); // payload //
 25                     line = f.readLine();
 26                 }
 27                 posInFile = f.getFilePointer();
 28             }
 29 
 30             Thread.sleep(3000);
 31         }
 32     }