--- a/src/hotspot/share/classfile/classListParser.cpp	Fri Jan 11 13:34:57 2019 +0100
+++ b/src/hotspot/share/classfile/classListParser.cpp	Fri Jan 11 14:05:57 2019 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2019, 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
@@ -47,7 +47,15 @@
   assert(_instance == NULL, "must be singleton");
   _instance = this;
   _classlist_file = file;
-  _file = fopen(file, "r");
+  _file = NULL;
+  // Use os::open() because neither fopen() nor os::fopen()
+  // can handle long path name on Windows.
+  int fd = os::open(file, O_RDONLY, S_IREAD);
+  if (fd != -1) {
+    // Obtain a File* from the file descriptor so that fgets()
+    // can be used in parse_one_line()
+    _file = os::open(fd, "r");
+  }
   if (_file == NULL) {
     char errmsg[JVM_MAXPATHLEN];
     os::lasterror(errmsg, JVM_MAXPATHLEN);

--- a/src/hotspot/share/memory/metaspaceShared.cpp	Fri Jan 11 13:34:57 2019 +0100
+++ b/src/hotspot/share/memory/metaspaceShared.cpp	Fri Jan 11 14:05:57 2019 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2019, 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
@@ -1659,7 +1659,6 @@
     ResourceMark rm;
     char class_list_path_str[JVM_MAXPATHLEN];
     // Preload classes to be shared.
-    // Should use some os:: method rather than fopen() here. aB.
     const char* class_list_path;
     if (SharedClassListFile == NULL) {
       // Construct the path to the class list (in jre/lib)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/appcds/LongClassListPath.java	Fri Jan 11 14:05:57 2019 -0800
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ */
+
+/*
+ * @test
+ * @summary Test the handling of long path to the classlist file.
+ * @requires vm.cds
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ *          java.management
+ *          jdk.jartool/sun.tools.jar
+ * @compile test-classes/Hello.java
+ * @run driver LongClassListPath
+ */
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.util.Arrays;
+import jdk.test.lib.cds.CDSOptions;
+import jdk.test.lib.cds.CDSTestUtils;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class LongClassListPath {
+    private static final int MAX_PATH = 260;
+    public static void main(String[] args) throws Exception {
+        String[] classes = {"hello"};
+        String classList =
+            CDSTestUtils.makeClassList(classes).getPath();
+        String archiveName = "LongClassListPath.jsa";
+
+        // Create a directory with long path and copy the classlist file to
+        // the directory.
+        Path classDir = Paths.get(System.getProperty("test.classes"));
+        Path destDir = classDir;
+        int subDirLen = MAX_PATH - classDir.toString().length() - 2;
+        if (subDirLen > 0) {
+            char[] chars = new char[subDirLen];
+            Arrays.fill(chars, 'x');
+            String subPath = new String(chars);
+            destDir = Paths.get(System.getProperty("test.classes"), subPath);
+        }
+        File longDir = destDir.toFile();
+        longDir.mkdir();
+        String destClassList = longDir.getPath() + File.separator + "LongClassListPath.classlist";
+        Files.copy(Paths.get(classList), Paths.get(destClassList), StandardCopyOption.REPLACE_EXISTING);
+
+        CDSOptions opts = (new CDSOptions())
+            .addPrefix("-XX:ExtraSharedClassListFile=" + destClassList, "-cp", JarBuilder.getOrCreateHelloJar())
+            .setArchiveName(archiveName);
+        CDSTestUtils.createArchiveAndCheck(opts);
+    }
+}

--- a/test/hotspot/jtreg/runtime/appcds/jigsaw/classpathtests/DummyClassesInBootClassPath.java	Fri Jan 11 13:34:57 2019 +0100
+++ b/test/hotspot/jtreg/runtime/appcds/jigsaw/classpathtests/DummyClassesInBootClassPath.java	Fri Jan 11 14:05:57 2019 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2019, 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
@@ -63,6 +63,8 @@
         String appJar = TestCommon.getTestJar("dummyClasses.jar");
         OutputAnalyzer dumpOutput = TestCommon.dump(
             appJar, classNames, "-Xbootclasspath/a:" + appJar);
+        TestCommon.checkDump(dumpOutput);
+
         List<String> argsList = new ArrayList<String>();
         for (int i = 0; i < classNames.length; i++) {
             argsList.add(classNames[i].replace('/', '.'));