--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/tools/jlink/plugins/SystemModuleDescriptors/src/m4/p4/Main.java	Mon Jan 30 11:00:18 2017 -0800
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package p4;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.module.ModuleDescriptor;
+import java.lang.module.ModuleFinder;
+import java.lang.reflect.Layer;
+import java.net.URI;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.Set;
+
+public class Main {
+    // the system module plugin by default drops ModuleTarget attribute
+    private static boolean expectModuleTarget = false;
+    public static void main(String... args) throws IOException {
+        if (args.length > 0) {
+            if (!args[0].equals("retainModuleTarget")) {
+                throw new IllegalArgumentException(args[0]);
+            }
+
+            expectModuleTarget = true;
+        }
+
+        // java.base is packaged with osName/osArch/osVersion
+        ModuleDescriptor md = Layer.boot().findModule("java.base").get()
+                                   .getDescriptor();
+        if (!md.osName().isPresent() ||
+                !md.osArch().isPresent() ||
+                !md.osVersion().isPresent()) {
+            throw new RuntimeException("osName/osArch/osVersion is missing: " +
+                md.osName() + " " + md.osArch() + " " + md.osVersion());
+        }
+
+        // verify module-info.class for m1 and m4
+        checkModule("m1", "p1", "p2");
+        checkModule("m4", "p4");
+    }
+
+    private static void checkModule(String mn, String... packages) throws IOException {
+        // verify ModuleDescriptor from the runtime module
+        ModuleDescriptor md = Layer.boot().findModule(mn).get()
+                                   .getDescriptor();
+        checkModuleDescriptor(md, packages);
+
+        // verify ModuleDescriptor from module-info.class read from ModuleReader
+        try (InputStream in = ModuleFinder.ofSystem().find(mn).get()
+            .open().open("module-info.class").get()) {
+            checkModuleDescriptor(ModuleDescriptor.read(in), packages);
+        }
+
+        // verify ModuleDescriptor from module-info.class read from jimage
+        FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"),
+            Collections.emptyMap());
+        Path path = fs.getPath("/", "modules", mn, "module-info.class");
+        checkModuleDescriptor(ModuleDescriptor.read(Files.newInputStream(path)), packages);
+    }
+
+    static void checkModuleDescriptor(ModuleDescriptor md, String... packages) {
+        String mainClass = md.name().replace('m', 'p') + ".Main";
+        if (!md.mainClass().get().equals(mainClass)) {
+            throw new RuntimeException(md.mainClass().toString());
+        }
+
+        if (expectModuleTarget) {
+            // ModuleTarget attribute is retained
+            if (!md.osName().isPresent() || !md.osArch().isPresent()) {
+                throw new RuntimeException("osName or osArch is missing: " +
+                    md.osName() + " " + md.osArch());
+            }
+        } else {
+            // by default ModuleTarget attribute is dropped
+            if (md.osName().isPresent() || md.osArch().isPresent()) {
+                throw new RuntimeException("osName and osArch should not be set: " +
+                    md.osName() + " " + md.osArch());
+            }
+        }
+
+        if (md.osVersion().isPresent()) {
+            throw new RuntimeException("Expected no osVersion set: " + md.osVersion());
+        }
+
+        Set<String> pkgs = md.packages();
+        if (!pkgs.equals(Set.of(packages))) {
+            throw new RuntimeException(pkgs + " expected: " + Set.of(packages));
+        }
+    }
+}