--- a/jdk/src/java.base/share/classes/sun/security/provider/JavaKeyStore.java	Tue Dec 23 15:10:15 2014 +0000
+++ b/jdk/src/java.base/share/classes/sun/security/provider/JavaKeyStore.java	Tue Dec 23 16:30:57 2014 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2014, 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
@@ -31,9 +31,11 @@
 import java.security.cert.CertificateFactory;
 import java.security.cert.CertificateException;
 import java.util.*;
+
 import sun.misc.IOUtils;
-
 import sun.security.pkcs.EncryptedPrivateKeyInfo;
+import sun.security.pkcs12.PKCS12KeyStore;
+import sun.security.util.KeyStoreDelegator;
 
 /**
  * This class provides the keystore implementation referred to as "JKS".
@@ -49,7 +51,7 @@
  * @since 1.2
  */
 
-abstract class JavaKeyStore extends KeyStoreSpi {
+public abstract class JavaKeyStore extends KeyStoreSpi {
 
     // regular JKS
     public static final class JKS extends JavaKeyStore {
@@ -65,6 +67,13 @@
         }
     }
 
+    // special JKS that supports JKS and PKCS12 file formats
+    public static final class DualFormatJKS extends KeyStoreDelegator {
+        public DualFormatJKS() {
+            super("JKS", JKS.class, "PKCS12", PKCS12KeyStore.class);
+        }
+    }
+
     private static final int MAGIC = 0xfeedfeed;
     private static final int VERSION_1 = 0x01;
     private static final int VERSION_2 = 0x02;
@@ -799,4 +808,20 @@
         md.update("Mighty Aphrodite".getBytes("UTF8"));
         return md;
     }
+
+    /**
+     * Probe the first few bytes of the keystore data stream for a valid
+     * JKS keystore encoding.
+     */
+    @Override
+    public boolean engineProbe(InputStream stream) throws IOException {
+        DataInputStream dataStream;
+        if (stream instanceof DataInputStream) {
+            dataStream = (DataInputStream)stream;
+        } else {
+            dataStream = new DataInputStream(stream);
+        }
+
+        return MAGIC == dataStream.readInt();
+    }
 }