1 /*
   2  * Copyright (c) 2017, 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 package p1;
  24 
  25 import java.lang.module.ModuleFinder;
  26 import java.util.Set;
  27 import java.util.stream.Collectors;
  28 import java.util.stream.Stream;
  29 
  30 /**
  31  * This tests if JAVA_HOME is linked only with the specified modules.
  32  */
  33 public class Main {
  34     public static void main(String... args) {
  35         Set<String> modules = ModuleFinder.ofSystem().findAll().stream()
  36             .map(mref -> mref.descriptor().name())
  37             .filter(mn -> !mn.equals("java.base"))
  38             .collect(Collectors.toSet());
  39 
  40         Set<String> notLinked = Stream.of(args).filter(mn -> !modules.contains(mn))
  41                                       .collect(Collectors.toSet());
  42         if (!notLinked.isEmpty()) {
  43             throw new RuntimeException("Expected modules not linked in the image: "
  44                 + notLinked);
  45         }
  46         Stream.of(args).forEach(modules::remove);
  47 
  48         if (!modules.isEmpty()) {
  49             throw new RuntimeException("Unexpected modules linked in the image: "
  50                 + modules);
  51         }
  52     }
  53 }