--- a/src/hotspot/share/classfile/sharedClassUtil.cpp	Fri Dec 01 11:17:45 2017 -0800
+++ b/src/hotspot/share/classfile/sharedClassUtil.cpp	Fri Dec 01 15:53:15 2017 -0800
@@ -141,23 +141,26 @@
   ResourceMark rm(THREAD);
   jint manifest_size;
   bool isSigned;
-  char* manifest = ClassLoaderExt::read_manifest(cpe, &manifest_size, CHECK);
-  if (manifest != NULL) {
-    ManifestStream* stream = new ManifestStream((u1*)manifest,
-                                                manifest_size);
-    isSigned = stream->check_is_signed();
-    if (isSigned) {
-      ent->_is_signed = true;
-    } else {
-      // Copy the manifest into the shared archive
-      manifest = ClassLoaderExt::read_raw_manifest(cpe, &manifest_size, CHECK);
-      Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data,
-                                                      manifest_size,
-                                                      THREAD);
-      char* p = (char*)(buf->data());
-      memcpy(p, manifest, manifest_size);
-      ent->set_manifest(buf);
-      ent->_is_signed = false;
+
+  if (cpe->is_jar_file()) {
+    char* manifest = ClassLoaderExt::read_manifest(cpe, &manifest_size, CHECK);
+    if (manifest != NULL) {
+      ManifestStream* stream = new ManifestStream((u1*)manifest,
+                                                  manifest_size);
+      isSigned = stream->check_is_signed();
+      if (isSigned) {
+        ent->_is_signed = true;
+      } else {
+        // Copy the manifest into the shared archive
+        manifest = ClassLoaderExt::read_raw_manifest(cpe, &manifest_size, CHECK);
+        Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data,
+                                                        manifest_size,
+                                                        THREAD);
+        char* p = (char*)(buf->data());
+        memcpy(p, manifest, manifest_size);
+        ent->set_manifest(buf);
+        ent->_is_signed = false;
+      }
     }
   }
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/appcds/DirClasspathTest.java	Fri Dec 01 15:53:15 2017 -0800
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ *
+ */
+
+/*
+ * @test
+ * @summary AppCDS handling of directories in -cp
+ * AppCDS does not support uncompressed oops
+ * @requires (vm.opt.UseCompressedOops == null) | (vm.opt.UseCompressedOops == true)
+ * @library /test/lib
+ * @run main DirClasspathTest
+ */
+
+import jdk.test.lib.Platform;
+import jdk.test.lib.process.OutputAnalyzer;
+import java.io.File;
+
+public class DirClasspathTest {
+    public static void main(String[] args) throws Exception {
+        File dir = new File(System.getProperty("user.dir"));
+        File emptydir = new File(dir, "emptydir");
+        emptydir.mkdir();
+
+        // Empty dir in -cp: should be OK
+        OutputAnalyzer output;
+        if (!Platform.isWindows()) {
+            // This block fails on Windows because of JDK-8192927
+            output = TestCommon.dump(emptydir.getPath(), TestCommon.list("DoesntMatter"), "-Xlog:class+path=info");
+            TestCommon.checkDump(output);
+        }
+
+        // Non-empty dir in -cp: should fail
+        // <dir> is not empty because it has at least one subdirectory, i.e., <emptydir>
+        output = TestCommon.dump(dir.getPath(), TestCommon.list("DoesntMatter"), "-Xlog:class+path=info");
+        output.shouldNotHaveExitValue(0);
+        output.shouldContain("CDS allows only empty directories in archived classpaths");
+    }
+}