--- a/src/java.base/share/classes/java/security/PKCS12Attribute.java	Sat Apr 07 17:07:13 2018 -0700
+++ b/src/java.base/share/classes/java/security/PKCS12Attribute.java	Sun Apr 08 11:32:46 2018 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2018, 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
@@ -44,7 +44,7 @@
         Pattern.compile("^[0-9a-fA-F]{2}(:[0-9a-fA-F]{2})+$");
     private String name;
     private String value;
-    private byte[] encoded;
+    private final byte[] encoded;
     private int hashValue = -1;
 
     /**
@@ -199,7 +199,7 @@
         if (!(obj instanceof PKCS12Attribute)) {
             return false;
         }
-        return Arrays.equals(encoded, ((PKCS12Attribute) obj).getEncoded());
+        return Arrays.equals(encoded, ((PKCS12Attribute) obj).encoded);
     }
 
     /**
@@ -210,10 +210,11 @@
      */
     @Override
     public int hashCode() {
-        if (hashValue == -1) {
-            Arrays.hashCode(encoded);
+        int h = hashValue;
+        if (h == -1) {
+            hashValue = h = Arrays.hashCode(encoded);
         }
-        return hashValue;
+        return h;
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/security/PKCS12Attribute/HashCode.java	Sun Apr 08 11:32:46 2018 +0800
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018, 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 8200792
+ * @summary PKCS12Attribute#hashCode is always constant -1
+ */
+
+import java.security.PKCS12Attribute;
+
+public class HashCode {
+    public static void main(String[] args) throws Exception {
+        int h1 = new PKCS12Attribute("1.2.3.4", "AA").hashCode();
+        int h2 = new PKCS12Attribute("2.3.4.5", "BB,CC").hashCode();
+        if (h1 == -1 || h2 == -1 || h1 == h2) {
+            throw new Exception("I see " + h1 + " and " + h2);
+        }
+    }
+}