1 /*
   2  * Copyright (c) 2015, 2017, 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 /**
  26  * Used with -p or --upgrade-module-path to exercise the replacement
  27  * of classes in modules that are linked into the runtime image.
  28  */
  29 
  30 package jdk.test;
  31 
  32 public class Main {
  33     static final ClassLoader PLATFORM_LOADER = ClassLoader.getPlatformClassLoader();
  34     static final ClassLoader SYS_LOADER      = ClassLoader.getSystemClassLoader();
  35 
  36     public static void main(String[] args) throws Exception {
  37         ClassLoader loader = null;
  38         boolean shouldOverride = false;
  39 
  40         /*
  41          * 3 Arguments are passed to this test:
  42          *   1. className: Name of the class to load.
  43          *   2. loaderName: Either "platform" or "app", which specifies which ClassLoader is expected
  44          *      to be the defining ClassLoader once the class is loaded. The initiating
  45          *      ClassLoader is always the default ClassLoader (which should be the
  46          *      app (system) ClassLoader.
  47          *   3. shouldOverride: Either "true" or "false" to indicate whether the loaded class
  48          *      should be the one we are attempting to override with (not the archived version).
  49          */
  50 
  51         assertTrue(args.length == 3, "Unexpected number of arguments: expected 3, actual " + args.length);
  52         String className = args[0].replace('/', '.');
  53         String loaderName = args[1]; // "platform" or "app"
  54         String shouldOverrideName = args[2];  // "true" or "false"
  55 
  56         if (loaderName.equals("app")) {
  57             loader = SYS_LOADER;
  58         } else if (loaderName.equals("platform")) {
  59             loader = PLATFORM_LOADER;
  60         } else {
  61             assertTrue(false);
  62         }
  63 
  64         if (shouldOverrideName.equals("true")) {
  65             shouldOverride = true;
  66         } else if (shouldOverrideName.equals("false")) {
  67             shouldOverride = false;
  68         } else {
  69             assertTrue(false);
  70         }
  71 
  72         // Load the class with the default ClassLoader.
  73         Class<?> clazz = Class.forName(className, true, loader);
  74         // Make sure we got the expected defining ClassLoader
  75         testLoader(clazz, loader);
  76         // Create an instance and see what toString() returns
  77         String s = clazz.newInstance().toString();
  78         // The overridden version of the class should return "hi". Make sure
  79         // it does only if we are expecting to have loaded the overridden version.
  80         assertTrue(s.equals("hi") == shouldOverride);
  81     }
  82 
  83     /**
  84      * Asserts that given class has the expected defining loader.
  85      */
  86     static void testLoader(Class<?> clazz, ClassLoader expected) {
  87         ClassLoader loader = clazz.getClassLoader();
  88         if (loader != expected) {
  89             throw new RuntimeException(clazz + " loaded by " + loader + ", expected " + expected);
  90         }
  91     }
  92 
  93     static void assertTrue(boolean expr) {
  94         assertTrue(expr, "");
  95     }
  96 
  97     static void assertTrue(boolean expr, String msg) {
  98         if (!expr)
  99             throw new RuntimeException("assertion failed: " + msg);
 100     }
 101 }