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