--- a/src/java.base/share/classes/sun/security/pkcs12/PKCS12KeyStore.java	Mon Jun 12 14:30:40 2017 -0700
+++ b/src/java.base/share/classes/sun/security/pkcs12/PKCS12KeyStore.java	Tue Jun 13 13:31:32 2017 +0100
@@ -2408,9 +2408,9 @@
         { 0x3081000201033081L, 0x0006092A864886F7L, 0x0D010701A0810004L },
         { 0x3082000002010330L, 0x810006092A864886L, 0xF70D010701A08100L },
         { 0x3083000000020103L, 0x3082000006092A86L, 0x4886F70D010701A0L },
-        { 0x3083000000020103L, 0x308200000006092AL, 0x864886F70D010701L },
-        { 0x3084000000000201L, 0x0330820000000609L, 0x2A864886F70D0107L },
-        { 0x3084000000000201L, 0x0330820000000006L, 0x092A864886F70D01L }
+        { 0x3083000000020103L, 0x308300000006092AL, 0x864886F70D010701L },
+        { 0x3084000000000201L, 0x0330830000000609L, 0x2A864886F70D0107L },
+        { 0x3084000000000201L, 0x0330840000000006L, 0x092A864886F70D01L }
     };
 
     private static final long[][] PKCS12_HEADER_MASKS = {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/sun/security/pkcs12/ProbeLargeKeystore.java	Tue Jun 13 13:31:32 2017 +0100
@@ -0,0 +1,82 @@
+/*
+ * 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 8181978
+ * @summary Test automatic keystore type detection for a large PKCS12 keystore
+ */
+
+import java.io.*;
+import java.security.*;
+import java.security.cert.*;
+import java.security.cert.Certificate;
+
+public class ProbeLargeKeystore {
+
+    private static final String DIR = System.getProperty("test.src", ".");
+    private static final String CERT = DIR + "/trusted.pem";
+    private static final String ALIAS = "test-entry-";
+    private static final int COUNT = 100;
+    private static final String KEYSTORE = "test-keystore.p12";
+    private static final char[] PASSWORD = "passphrase".toCharArray();
+
+    public static final void main(String[] args) throws Exception {
+
+        // Create a large PKCS12 keystore
+
+        new File(KEYSTORE).delete();
+        KeyStore keystore = KeyStore.getInstance("PKCS12");
+        keystore.load(null, null);
+        Certificate cert = loadCertificate(CERT);
+
+        for (int i = 0; i < COUNT; i++) {
+            keystore.setCertificateEntry(ALIAS + i, cert);
+        }
+
+        try (FileOutputStream out = new FileOutputStream(KEYSTORE)) {
+            keystore.store(out, PASSWORD);
+        }
+
+        // Test the automatic keystore type detection mechanism for PKCS12
+
+        KeyStore largeKeystore =
+           KeyStore.getInstance(new File(KEYSTORE), PASSWORD);
+
+        if (largeKeystore.size() != COUNT) {
+            throw new Exception("Error detecting a large PKCS12 keystore");
+        }
+
+        new File(KEYSTORE).delete();
+        System.out.println("OK");
+    }
+
+    private static final Certificate loadCertificate(String certFile)
+            throws Exception {
+        try (FileInputStream certStream = new FileInputStream(certFile)) {
+             CertificateFactory factory =
+                 CertificateFactory.getInstance("X.509");
+            return factory.generateCertificate(certStream);
+        }
+    }
+}