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 }