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 import java.lang.module.Configuration;
  25 import java.lang.module.ModuleFinder;
  26 import java.lang.reflect.Layer;
  27 import java.lang.reflect.Method;
  28 import java.lang.reflect.Module;
  29 import java.net.URL;
  30 import java.net.URLClassLoader;
  31 import java.nio.file.Path;
  32 import java.nio.file.Paths;
  33 import java.util.Set;
  34 
  35 public class TestLayer {
  36     private static final Path MODS_DIR = Paths.get("mods");
  37     private static final Set<String> modules = Set.of("m1", "m2");
  38 
  39     public static void main(String[] args) throws Exception {
  40         // disable security manager until Class.forName is called.
  41         SecurityManager sm = System.getSecurityManager();
  42         if (sm != null) {
  43             System.setSecurityManager(null);
  44         }
  45 
  46         ModuleFinder finder = ModuleFinder.of(MODS_DIR);
  47 
  48         Configuration parent = Layer.boot().configuration();
  49         Configuration cf = parent.resolveAndBind(ModuleFinder.of(),
  50                                                  finder,
  51                                                  modules);
  52 
  53         ClassLoader scl = ClassLoader.getSystemClassLoader();
  54         Layer layer = Layer.boot().defineModulesWithManyLoaders(cf, scl);
  55 
  56         Module m1 = layer.findModule("m1").get();
  57         Module m2 = layer.findModule("m2").get();
  58 
  59         if (sm != null) {
  60             System.setSecurityManager(sm);
  61         }
  62 
  63         // find exported and non-exported class from a named module
  64         findClass(m1, "p1.A");
  65         findClass(m1, "p1.internal.B");
  66         findClass(m2, "p2.C");
  67 
  68         // find class from unnamed module
  69         ClassLoader ld = TestLayer.class.getClassLoader();
  70         findClass(ld.getUnnamedModule(), "TestDriver");
  71 
  72         // check if clinit should not be initialized
  73         // compile without module-path; so use reflection
  74         Class<?> c = Class.forName(m1, "p1.Initializer");
  75         Method m = c.getMethod("isInited");
  76         Boolean isClinited = (Boolean) m.invoke(null);
  77         if (isClinited.booleanValue()) {
  78            throw new RuntimeException("clinit should not be invoked");
  79         }
  80     }
  81 
  82     static Class<?> findClass(Module module, String cn) {
  83         Class<?> c = Class.forName(module, cn);
  84         if (c == null) {
  85             throw new RuntimeException(cn + " not found in " + module);
  86         }
  87         if (c.getModule() != module) {
  88             throw new RuntimeException(c.getModule() + " != " + module);
  89         }
  90         return c;
  91     }
  92 }