1 /*
   2  * Copyright (c) 2016, 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
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test TestLogTruncation
  26  * @summary Ensure log files are truncated and not appended on VM startup
  27  * @library /testlibrary
  28  */
  29 
  30 import java.nio.file.Files;
  31 import java.nio.file.Paths;
  32 
  33 import jdk.test.lib.ProcessTools;
  34 import jdk.test.lib.OutputAnalyzer;
  35 
  36 import static jdk.test.lib.Asserts.assertEquals;
  37 
  38 public class TestLogTruncation {
  39 
  40     public static void main(String[] args) throws Exception {
  41         // Run two VMs with the same log file
  42         for (int i = 0; i < 2; i++) {
  43             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:logging=trace:out.log", "-version");
  44             OutputAnalyzer output = new OutputAnalyzer(pb.start());
  45             output.shouldHaveExitValue(0);
  46         }
  47 
  48         // Message should only appear once in the log file, since the second run should overwrite the previous log
  49         long occurences = Files.lines(Paths.get("out.log"))
  50                 .filter(s -> s.contains("Log configuration fully initialized.")).count();
  51         assertEquals(occurences, 1L, "Log file not truncated on VM startup");
  52     }
  53 }
  54