1 /*
   2  * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  22  */
  23 
  24 /* @test
  25    @bug 4101707
  26    @summary Test if fill() will behave correctly at EOF to
  27             allow file to grow.
  28 */
  29 
  30 import java.io.*;
  31 
  32 public class GrowAfterEOF {
  33     public static void main(String[] args) throws Exception {
  34         File input = new File(".", "TestEOFInput.txt");
  35         RandomAccessFile rf = new RandomAccessFile(input, "rw");
  36         try {
  37             BufferedReader r = new BufferedReader
  38                 (new InputStreamReader(new FileInputStream(input)));
  39             try {
  40                 // write something
  41                 rf.writeBytes("a line");
  42 
  43                 // read till the end of file
  44                 while (r.readLine() != null);
  45 
  46                 // append to the end of the file
  47                 rf.seek(rf.length());
  48                 rf.writeBytes("new line");
  49 
  50                 // now try to read again
  51                 boolean readMore = false;
  52                 while (r.readLine() != null) {
  53                     readMore = true;
  54                 }
  55                 if (!readMore) {
  56                     input.delete();
  57                     throw new Exception("Failed test: unable to read!");
  58                 } else {
  59                     input.delete();
  60                 }
  61             } finally {
  62                 r.close();
  63             }
  64         } finally {
  65             rf.close();
  66         }
  67     }
  68 }