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
  26  * @modules java.base/jdk.internal.misc
  27  * @library /test/lib ..
  28  * @build sun.hotspot.WhiteBox
  29  * @compile/module=java.base java/lang/reflect/ModuleHelper.java
  30  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  31  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  32  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI JVMAddReadsModule
  33  */
  34 
  35 import static jdk.test.lib.Asserts.*;
  36 
  37 public class JVMAddReadsModule {
  38 
  39     public static void main(String args[]) throws Throwable {
  40         MyClassLoader from_cl = new MyClassLoader();
  41         MyClassLoader to_cl = new MyClassLoader();
  42         Object from_module, to_module;
  43 
  44         from_module = ModuleHelper.ModuleObject("from_module", from_cl, new String[] { "mypackage" });
  45         assertNotNull(from_module, "Module should not be null");
  46         ModuleHelper.DefineModule(from_module, "9.0", "from_module/here", new String[] { "mypackage" });
  47 
  48         to_module = ModuleHelper.ModuleObject("to_module", to_cl, new String[] { "yourpackage" });
  49         assertNotNull(to_module, "Module should not be null");
  50         ModuleHelper.DefineModule(to_module, "9.0", "to_module/here", new String[] { "yourpackage" });
  51 
  52         // Null from_module argument, expect NPE
  53         try {
  54             ModuleHelper.AddReadsModule(null, to_module);
  55             throw new RuntimeException("Failed to get the expected NPE");
  56         } catch (NullPointerException e) {
  57             // Expected
  58         }
  59 
  60         // Null to_module argument, expect NPE
  61         try {
  62             ModuleHelper.AddReadsModule(from_module, null);
  63             throw new RuntimeException("Unexpected NPE was thrown");
  64         } catch (NullPointerException e) {
  65             // Expected
  66         }
  67 
  68         // Null from_module and to_module arguments, expect NPE
  69         try {
  70             ModuleHelper.AddReadsModule(null, null);
  71             throw new RuntimeException("Failed to get the expected NPE");
  72         } catch (NullPointerException e) {
  73             // Expected
  74         }
  75 
  76         // Both modules are the same, should not throw an exception
  77         ModuleHelper.AddReadsModule(from_module, from_module);
  78 
  79         // Duplicate calls, should not throw an exception
  80         ModuleHelper.AddReadsModule(from_module, to_module);
  81         ModuleHelper.AddReadsModule(from_module, to_module);
  82     }
  83 
  84     static class MyClassLoader extends ClassLoader { }
  85 }