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 /*
  26  * @test LoaderConstraintsTest
  27  * @bug 8149996
  28  * @modules java.base/jdk.internal.misc
  29  * @library /testlibrary /runtime/testlibrary
  30  * @library classes
  31  * @build ClassUnloadCommon test.Empty jdk.test.lib.* jdk.test.lib.OutputAnalyzer jdk.test.lib.ProcessTools
  32  * @run driver LoaderConstraintsTest
  33  */
  34 
  35 import jdk.test.lib.*;
  36 import java.lang.ref.WeakReference;
  37 import java.lang.reflect.Method;
  38 import java.util.ArrayList;
  39 import java.util.Collections;
  40 import java.util.List;
  41 
  42 public class LoaderConstraintsTest {
  43     private static OutputAnalyzer out;
  44     private static ProcessBuilder pb;
  45     private static class ClassUnloadTestMain {
  46         public static void main(String... args) throws Exception {
  47             String className = "test.Empty";
  48             ClassLoader cl = ClassUnloadCommon.newClassLoader();
  49             Class<?> c = cl.loadClass(className);
  50             cl = null; c = null;
  51             ClassUnloadCommon.triggerUnloading();
  52         }
  53     }
  54 
  55     // Use the same command-line heap size setting as ../ClassUnload/UnloadTest.java
  56     static ProcessBuilder exec(String... args) throws Exception {
  57         List<String> argsList = new ArrayList<>();
  58         Collections.addAll(argsList, args);
  59         Collections.addAll(argsList, "-Xmn8m");
  60         Collections.addAll(argsList, "-Dtest.classes=" + System.getProperty("test.classes","."));
  61         Collections.addAll(argsList, ClassUnloadTestMain.class.getName());
  62         return ProcessTools.createJavaProcessBuilder(argsList.toArray(new String[argsList.size()]));
  63     }
  64 
  65     public static void main(String... args) throws Exception {
  66 
  67         // -XX:+TraceLoaderConstraints
  68         pb = exec("-XX:+TraceLoaderConstraints");
  69         out = new OutputAnalyzer(pb.start());
  70         out.getOutput();
  71         out.shouldContain("[class,loader,constraints] adding new constraint for name: java/lang/Class, loader[0]: jdk/internal/loader/ClassLoaders$AppClassLoader, loader[1]: <bootloader>");
  72 
  73         // -Xlog:class+loader+constraints=info
  74         pb = exec("-Xlog:class+loader+constraints=info");
  75         out = new OutputAnalyzer(pb.start());
  76         out.shouldContain("[class,loader,constraints] adding new constraint for name: java/lang/Class, loader[0]: jdk/internal/loader/ClassLoaders$AppClassLoader, loader[1]: <bootloader>");
  77 
  78         // -XX:-TraceLoaderConstraints
  79         pb = exec("-XX:-TraceLoaderConstraints");
  80         out = new OutputAnalyzer(pb.start());
  81         out.shouldNotContain("[class,loaderconstraints]");
  82 
  83         // -Xlog:class+loader+constraints=off
  84         pb = exec("-Xlog:class+loader+constraints=off");
  85         out = new OutputAnalyzer(pb.start());
  86         out.shouldNotContain("[class,loader,constraints]");
  87 
  88     }
  89 }