--- a/src/java.base/share/classes/sun/security/provider/DSAKeyFactory.java	Fri Aug 17 13:37:01 2018 -0700
+++ b/src/java.base/share/classes/sun/security/provider/DSAKeyFactory.java	Fri Aug 17 22:20:47 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 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
@@ -30,7 +30,6 @@
 import java.security.PrivateKey;
 import java.security.KeyFactorySpi;
 import java.security.InvalidKeyException;
-import java.security.AccessController;
 import java.security.interfaces.DSAParams;
 import java.security.spec.DSAPublicKeySpec;
 import java.security.spec.DSAPrivateKeySpec;
@@ -39,8 +38,6 @@
 import java.security.spec.X509EncodedKeySpec;
 import java.security.spec.PKCS8EncodedKeySpec;
 
-import sun.security.action.GetPropertyAction;
-
 /**
  * This class implements the DSA key factory of the Sun provider.
  *
@@ -51,29 +48,6 @@
  */
 
 public class DSAKeyFactory extends KeyFactorySpi {
-
-    // package private for DSAKeyPairGenerator
-    static final boolean SERIAL_INTEROP;
-    private static final String SERIAL_PROP = "sun.security.key.serial.interop";
-
-    static {
-
-        /**
-         * Check to see if we need to maintain interoperability for serialized
-         * keys between JDK 5.0 -> JDK 1.4.  In other words, determine whether
-         * a key object serialized in JDK 5.0 must be deserializable in
-         * JDK 1.4.
-         *
-         * If true, then we generate sun.security.provider.DSAPublicKey.
-         * If false, then we generate sun.security.provider.DSAPublicKeyImpl.
-         *
-         * By default this is false.
-         * This incompatibility was introduced by 4532506.
-         */
-        String prop = GetPropertyAction.privilegedGetProperty(SERIAL_PROP);
-        SERIAL_INTEROP = "true".equalsIgnoreCase(prop);
-    }
-
     /**
      * Generates a public key object from the provided key specification
      * (key material).
@@ -90,25 +64,13 @@
         try {
             if (keySpec instanceof DSAPublicKeySpec) {
                 DSAPublicKeySpec dsaPubKeySpec = (DSAPublicKeySpec)keySpec;
-                if (SERIAL_INTEROP) {
-                    return new DSAPublicKey(dsaPubKeySpec.getY(),
-                                        dsaPubKeySpec.getP(),
-                                        dsaPubKeySpec.getQ(),
-                                        dsaPubKeySpec.getG());
-                } else {
-                    return new DSAPublicKeyImpl(dsaPubKeySpec.getY(),
-                                        dsaPubKeySpec.getP(),
-                                        dsaPubKeySpec.getQ(),
-                                        dsaPubKeySpec.getG());
-                }
+                return new DSAPublicKeyImpl(dsaPubKeySpec.getY(),
+                                    dsaPubKeySpec.getP(),
+                                    dsaPubKeySpec.getQ(),
+                                    dsaPubKeySpec.getG());
             } else if (keySpec instanceof X509EncodedKeySpec) {
-                if (SERIAL_INTEROP) {
-                    return new DSAPublicKey
-                        (((X509EncodedKeySpec)keySpec).getEncoded());
-                } else {
-                    return new DSAPublicKeyImpl
-                        (((X509EncodedKeySpec)keySpec).getEncoded());
-                }
+                return new DSAPublicKeyImpl
+                    (((X509EncodedKeySpec)keySpec).getEncoded());
             } else {
                 throw new InvalidKeySpecException
                     ("Inappropriate key specification");

--- a/src/java.base/share/classes/sun/security/provider/DSAKeyPairGenerator.java	Fri Aug 17 13:37:01 2018 -0700
+++ b/src/java.base/share/classes/sun/security/provider/DSAKeyPairGenerator.java	Fri Aug 17 22:20:47 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 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
@@ -166,11 +166,7 @@
             // See the comments in DSAKeyFactory, 4532506, and 6232513.
 
             DSAPublicKey pub;
-            if (DSAKeyFactory.SERIAL_INTEROP) {
-                pub = new DSAPublicKey(y, p, q, g);
-            } else {
-                pub = new DSAPublicKeyImpl(y, p, q, g);
-            }
+            pub = new DSAPublicKeyImpl(y, p, q, g);
             DSAPrivateKey priv = new DSAPrivateKey(x, p, q, g);
 
             KeyPair pair = new KeyPair(pub, priv);