1 /*
   2  * Copyright (c) 2016, 2018, 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 import static jdk.test.lib.Asserts.*;
  25 
  26 import java.lang.module.Configuration;
  27 import java.lang.module.ModuleDescriptor;
  28 import java.lang.module.ModuleFinder;
  29 import java.util.HashMap;
  30 import java.util.Map;
  31 import java.util.Set;
  32 
  33 //
  34 // ClassLoader1 --> defines m1x --> packages p1
  35 // ClassLoader1 --> defines m2x --> packages p2
  36 //
  37 // m1x can read m2x
  38 // package p2 in m2x is exported to m1x
  39 //
  40 // class p1.c1 defined in m1x tries to access p2.c2 defined in m2x
  41 // Access allowed since m1x can read m2x and package p2 is exported to m1x.
  42 //
  43 public class ModuleSameCLMain {
  44 
  45     // Create a layer over the boot layer.
  46     // Define modules within this layer to test access between
  47     // publically defined classes within packages of those modules.
  48     public void createLayerOnBoot() throws Throwable {
  49 
  50         // Define module:     m1x
  51         // Can read:          java.base, m2x
  52         // Packages:          p1
  53         // Packages exported: p1 is exported to unqualifiedly
  54         ModuleDescriptor descriptor_m1x =
  55                 ModuleDescriptor.newModule("m1x")
  56                         .requires("java.base")
  57                         .requires("m2x")
  58                         .exports("p1")
  59                         .build();
  60 
  61         // Define module:     m2x
  62         // Can read:          java.base
  63         // Packages:          p2
  64         // Packages exported: package p2 is exported to m1x
  65         ModuleDescriptor descriptor_m2x =
  66                 ModuleDescriptor.newModule("m2x")
  67                         .requires("java.base")
  68                         .exports("p2", Set.of("m1x"))
  69                         .build();
  70 
  71         // Set up a ModuleFinder containing all modules for this layer.
  72         ModuleFinder finder = ModuleLibrary.of(descriptor_m1x, descriptor_m2x);
  73 
  74         // Resolves "m1x"
  75         Configuration cf = ModuleLayer.boot()
  76                 .configuration()
  77                 .resolve(finder, ModuleFinder.of(), Set.of("m1x"));
  78 
  79         // map each module to the same class loader for this test
  80         Map<String, ClassLoader> map = new HashMap<>();
  81         Loader1 cl1 = new Loader1();
  82         map.put("m1x", cl1);
  83         map.put("m2x", cl1);
  84 
  85         // Create layer that contains m1x & m2x
  86         ModuleLayer layer = ModuleLayer.boot().defineModules(cf, map::get);
  87         assertTrue(layer.findLoader("m1x") == cl1);
  88         assertTrue(layer.findLoader("m2x") == cl1);
  89         assertTrue(layer.findLoader("java.base") == null);
  90 
  91         // now use the same loader to load class p1.c1
  92         Class p1_c1_class = cl1.loadClass("p1.c1");
  93         try {
  94             p1_c1_class.newInstance();
  95         } catch (IllegalAccessError e) {
  96             throw new RuntimeException("Test Failed, an IAE should not be thrown since p2 is exported qualifiedly to m1x");
  97         }
  98     }
  99 
 100     public static void main(String args[]) throws Throwable {
 101       ModuleSameCLMain test = new ModuleSameCLMain();
 102       test.createLayerOnBoot();
 103     }
 104 
 105     static class Loader1 extends ClassLoader { }
 106 }