--- a/jdk/src/java.base/share/classes/java/security/PKCS12Attribute.java	Fri Aug 25 12:39:21 2017 +0200
+++ b/jdk/src/java.base/share/classes/java/security/PKCS12Attribute.java	Thu Aug 24 16:49:56 2017 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 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
@@ -85,7 +85,8 @@
         // Validate value
         int length = value.length();
         String[] values;
-        if (value.charAt(0) == '[' && value.charAt(length - 1) == ']') {
+        if (length > 1 &&
+                value.charAt(0) == '[' && value.charAt(length - 1) == ']') {
             values = value.substring(1, length - 1).split(", ");
         } else {
             values = new String[]{ value };

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/security/pkcs12/EmptyAlias.java	Thu Aug 24 16:49:56 2017 +0100
@@ -0,0 +1,69 @@
+/*
+ * 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
+ * @bug 8173181
+ * @summary KeyStore regression due to default keystore being changed to PKCS12
+ */
+
+import java.io.*;
+import java.security.KeyStore;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+
+/**
+ * Test that a PKCS12 keystore entry can be created with an empty alias name.
+ */
+public class EmptyAlias {
+
+    private static final String DIR = System.getProperty("test.src", ".");
+    private static final String CERT = DIR + "/trusted.pem";
+    private static final String EMPTY_ALIAS = "";
+
+    public static void main(String[] args) throws Exception {
+        KeyStore keystore = KeyStore.getInstance("PKCS12");
+        keystore.load(null, null);
+
+        keystore.setCertificateEntry(EMPTY_ALIAS, loadCertificate(CERT));
+        KeyStore.Entry entry = keystore.getEntry(EMPTY_ALIAS, null);
+
+        if (entry == null) {
+            throw new Exception(
+                "Error retrieving keystore entry using its (empty) alias");
+        }
+
+        System.out.println("OK");
+    }
+
+    private static Certificate loadCertificate(String certFile)
+            throws Exception {
+        X509Certificate cert = null;
+        try (FileInputStream certStream = new FileInputStream(certFile)) {
+            CertificateFactory factory =
+                CertificateFactory.getInstance("X.509");
+            return factory.generateCertificate(certStream);
+        }
+    }
+}