1 /*
   2  * Copyright (c) 2013, 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 import java.util.Properties;
  24 
  25 /*
  26  * @test
  27  * @bug 8022854
  28  * @summary Test that System properties reinitialization returns consistent
  29  * results.
  30  * @author mduigou
  31  * @run main/othervm PropertiesReinit
  32  */
  33 public class PropertiesReinit {
  34     public static void main(String... args) {
  35         Properties first = System.getProperties();
  36 
  37         // Re-initialize (Why do we even have that lever?)
  38         System.setProperties(null);
  39 
  40         Properties second = System.getProperties();
  41 
  42         Properties diff1 = (Properties) first.clone();
  43         Properties diff2 = (Properties) second.clone();
  44 
  45         diff1.keySet().removeAll(second.keySet());
  46         diff2.keySet().removeAll(first.keySet());
  47 
  48         if(!diff1.isEmpty() || !diff2.isEmpty()) {
  49             System.out.println("Appearing in second: " + diff2 );
  50             System.out.println("Missing from second: " + diff1 );
  51 
  52             throw new RuntimeException("re-inited properties differed");
  53         }
  54     }
  55 }