1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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
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  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.
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  23 
  24 /**
  25  * @test
  26  * @summary Verify the defining class loader of each module never delegates
  27  *          to its child class loader. Also sanity check java.compact2
  28  *          requires.
  29  * @run testng/othervm -Djdk.launcher.addmods=ALL-SYSTEM VerifyModuleDelegation
  30  */
  31 
  32 import java.lang.module.ModuleDescriptor;
  33 import java.lang.module.ModuleFinder;
  34 import java.lang.module.ModuleReference;
  35 import java.lang.reflect.Layer;
  36 import java.util.Set;
  37 
  38 import static java.lang.module.ModuleDescriptor.Requires.Modifier.*;
  39 
  40 import org.testng.annotations.*;
  41 
  42 import static org.testng.Assert.*;
  43 
  44 public class VerifyModuleDelegation {
  45     private static final String JAVA_BASE = "java.base";
  46     private static final String JAVA_COMPACT1 = "java.compact1";
  47     private static final String JAVA_COMPACT2 = "java.compact2";
  48 
  49     private static final ModuleDescriptor BASE
  50         = new ModuleDescriptor.Builder(JAVA_BASE).build();
  51 
  52     private static final ModuleDescriptor COMPACT2
  53         = new ModuleDescriptor.Builder(JAVA_COMPACT2)
  54             .requires(MANDATED, JAVA_BASE)
  55             .requires(PUBLIC, JAVA_COMPACT1)
  56             .requires(PUBLIC, "java.rmi")
  57             .requires(PUBLIC, "java.sql")
  58             .requires(PUBLIC, "java.xml")
  59             .build();
  60 
  61     private static final Set<ModuleReference> MREFS
  62             = ModuleFinder.ofSystem().findAll();
  63 
  64     private void check(ModuleDescriptor md, ModuleDescriptor ref) {
  65         assertTrue(md.requires().size() == ref.requires().size());
  66         assertTrue(md.requires().containsAll(ref.requires()));
  67     }
  68 
  69     @Test
  70     public void checkJavaBase() {
  71         ModuleDescriptor md =
  72                 MREFS.stream().map(ModuleReference::descriptor)
  73                      .filter(d -> d.name().equals(JAVA_BASE))
  74                      .findFirst().orElseThrow(Error::new);
  75 
  76         check(md, BASE);
  77     }
  78     @Test
  79     public void checkCompact2() {
  80         ModuleDescriptor md =
  81                 MREFS.stream().map(ModuleReference::descriptor)
  82                      .filter(d -> d.name().equals(JAVA_COMPACT2))
  83                      .findFirst().orElseThrow(Error::new);
  84         check(md, COMPACT2);
  85     }
  86 
  87     @Test
  88     public void checkLoaderDelegation() {
  89         Layer boot = Layer.boot();
  90         MREFS.stream().map(ModuleReference::descriptor)
  91              .forEach(md -> md.requires().stream().forEach(req ->
  92                  {
  93                      // check if M requires D and D's loader must be either the
  94                      // same or an ancestor of M's loader
  95                      ClassLoader loader1 = boot.findLoader(md.name());
  96                      ClassLoader loader2 = boot.findLoader(req.name());
  97                      if (loader1 != loader2 && !isAncestor(loader2, loader1)) {
  98                          throw new Error(md.name() + " can't delegate to " +
  99                                          "find classes from " + req.name());
 100                      }
 101                  }));
 102     }
 103 
 104     // Returns true if p is an ancestor of cl i.e. class loader 'p' can
 105     // be found in the cl's delegation chain
 106     private static boolean isAncestor(ClassLoader p, ClassLoader cl) {
 107         if (p != null && cl == null) {
 108             return false;
 109         }
 110         ClassLoader acl = cl;
 111         do {
 112             acl = acl.getParent();
 113             if (p == acl) {
 114                 return true;
 115             }
 116         } while (acl != null);
 117         return false;
 118     }
 119 }