--- a/jdk/src/java.base/share/classes/java/net/DatagramSocketImpl.java	Thu Mar 03 14:29:00 2016 +0100
+++ b/jdk/src/java.base/share/classes/java/net/DatagramSocketImpl.java	Thu Mar 03 17:21:08 2016 +0000
@@ -27,9 +27,7 @@
 
 import java.io.FileDescriptor;
 import java.io.IOException;
-import java.io.InterruptedIOException;
 import java.util.Set;
-import java.util.HashSet;
 
 /**
  * Abstract datagram and multicast socket implementation base class.
@@ -352,32 +350,32 @@
         }
     }
 
-    private static final  Set<SocketOption<?>> dgSocketOptions =
-        new HashSet<>();
+    private static final Set<SocketOption<?>> dgSocketOptions;
 
-    private static final  Set<SocketOption<?>> mcSocketOptions =
-        new HashSet<>();
+    private static final Set<SocketOption<?>> mcSocketOptions;
 
     static {
-        dgSocketOptions.add(StandardSocketOptions.SO_SNDBUF);
-        dgSocketOptions.add(StandardSocketOptions.SO_RCVBUF);
-        dgSocketOptions.add(StandardSocketOptions.SO_REUSEADDR);
-        dgSocketOptions.add(StandardSocketOptions.IP_TOS);
+        dgSocketOptions = Set.of(StandardSocketOptions.SO_SNDBUF,
+                                 StandardSocketOptions.SO_RCVBUF,
+                                 StandardSocketOptions.SO_REUSEADDR,
+                                 StandardSocketOptions.IP_TOS);
 
-        mcSocketOptions.add(StandardSocketOptions.SO_SNDBUF);
-        mcSocketOptions.add(StandardSocketOptions.SO_RCVBUF);
-        mcSocketOptions.add(StandardSocketOptions.SO_REUSEADDR);
-        mcSocketOptions.add(StandardSocketOptions.IP_TOS);
-        mcSocketOptions.add(StandardSocketOptions.IP_MULTICAST_IF);
-        mcSocketOptions.add(StandardSocketOptions.IP_MULTICAST_TTL);
-        mcSocketOptions.add(StandardSocketOptions.IP_MULTICAST_LOOP);
-    };
+        mcSocketOptions = Set.of(StandardSocketOptions.SO_SNDBUF,
+                                 StandardSocketOptions.SO_RCVBUF,
+                                 StandardSocketOptions.SO_REUSEADDR,
+                                 StandardSocketOptions.IP_TOS,
+                                 StandardSocketOptions.IP_MULTICAST_IF,
+                                 StandardSocketOptions.IP_MULTICAST_TTL,
+                                 StandardSocketOptions.IP_MULTICAST_LOOP);
+    }
 
     /**
      * Returns a set of SocketOptions supported by this impl
      * and by this impl's socket (DatagramSocket or MulticastSocket)
      *
      * @return a Set of SocketOptions
+     *
+     * @since 9
      */
     protected Set<SocketOption<?>> supportedOptions() {
         if (getDatagramSocket() instanceof MulticastSocket) {

--- a/jdk/src/java.base/share/classes/java/net/SocketImpl.java	Thu Mar 03 14:29:00 2016 +0100
+++ b/jdk/src/java.base/share/classes/java/net/SocketImpl.java	Thu Mar 03 17:21:08 2016 +0000
@@ -30,8 +30,6 @@
 import java.io.OutputStream;
 import java.io.FileDescriptor;
 import java.util.Set;
-import java.util.HashSet;
-import java.util.Collections;
 
 /**
  * The abstract class {@code SocketImpl} is a common superclass
@@ -445,31 +443,31 @@
         }
     }
 
-    private static final  Set<SocketOption<?>> socketOptions =
-        new HashSet<>();
+    private static final Set<SocketOption<?>> socketOptions;
 
-    private static final  Set<SocketOption<?>> serverSocketOptions =
-        new HashSet<>();
+    private static final Set<SocketOption<?>> serverSocketOptions;
 
     static {
-        socketOptions.add(StandardSocketOptions.SO_KEEPALIVE);
-        socketOptions.add(StandardSocketOptions.SO_SNDBUF);
-        socketOptions.add(StandardSocketOptions.SO_RCVBUF);
-        socketOptions.add(StandardSocketOptions.SO_REUSEADDR);
-        socketOptions.add(StandardSocketOptions.SO_LINGER);
-        socketOptions.add(StandardSocketOptions.IP_TOS);
-        socketOptions.add(StandardSocketOptions.TCP_NODELAY);
+        socketOptions = Set.of(StandardSocketOptions.SO_KEEPALIVE,
+                               StandardSocketOptions.SO_SNDBUF,
+                               StandardSocketOptions.SO_RCVBUF,
+                               StandardSocketOptions.SO_REUSEADDR,
+                               StandardSocketOptions.SO_LINGER,
+                               StandardSocketOptions.IP_TOS,
+                               StandardSocketOptions.TCP_NODELAY);
 
-        serverSocketOptions.add(StandardSocketOptions.SO_RCVBUF);
-        serverSocketOptions.add(StandardSocketOptions.SO_REUSEADDR);
-        serverSocketOptions.add(StandardSocketOptions.IP_TOS);
-    };
+        serverSocketOptions = Set.of(StandardSocketOptions.SO_RCVBUF,
+                                     StandardSocketOptions.SO_REUSEADDR,
+                                     StandardSocketOptions.IP_TOS);
+    }
 
     /**
      * Returns a set of SocketOptions supported by this impl
      * and by this impl's socket (Socket or ServerSocket)
      *
      * @return a Set of SocketOptions
+     *
+     * @since 9
      */
     protected Set<SocketOption<?>> supportedOptions() {
         if (getSocket() != null) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/net/SocketOption/ImmutableOptions.java	Thu Mar 03 17:21:08 2016 +0000
@@ -0,0 +1,184 @@
+/*
+ * Copyright (c) 2016, 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 8148609
+ * @run testng/othervm ImmutableOptions
+ * @summary Assert that the set of socket options are immutable
+ */
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.*;
+import java.util.Set;
+
+import org.testng.annotations.BeforeTest;
+import org.testng.annotations.Test;
+
+public class ImmutableOptions {
+
+    @BeforeTest
+    void setupServerSocketFactory() throws IOException {
+        ServerSocket.setSocketFactory(new ServerSocketImplFactory());
+    }
+
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void socketThrows() throws IOException {
+        CustomSocketImpl impl = new CustomSocketImpl();
+        Socket socket = new CustomSocket(impl);
+        socket.supportedOptions().clear();
+    }
+
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void socketImplThrows() throws IOException {
+        CustomSocketImpl impl = new CustomSocketImpl();
+        impl.supportedOptions().clear();
+    }
+
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void serverSocketThrows() throws IOException {
+        ServerSocket ss = new ServerSocket();
+        ss.supportedOptions().clear();
+    }
+
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void serverSocketImplThrows() throws IOException {
+        ServerSocket ss = new ServerSocket();
+        ServerSocketImplFactory.mostRecentlyCreated.supportedOptions().clear();
+    }
+
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void datagramSocketThrows() throws IOException {
+        CustomDatagramSocketImpl impl = new CustomDatagramSocketImpl();
+        DatagramSocket socket = new CustomDatagramSocket(impl);
+        socket.supportedOptions().clear();
+    }
+
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void datagramSocketImplThrows() throws IOException {
+        CustomDatagramSocketImpl impl = new CustomDatagramSocketImpl();
+        impl.supportedOptions().clear();
+    }
+
+
+    // Socket descendants
+    static class CustomSocket extends Socket {
+        public CustomSocket(SocketImpl impl) throws IOException {
+            super(impl);
+        }
+    }
+
+    static class CustomDatagramSocket extends DatagramSocket {
+        public CustomDatagramSocket(DatagramSocketImpl impl) {
+            super(impl);
+        }
+    }
+
+    static class ServerSocketImplFactory implements SocketImplFactory {
+        static volatile CustomSocketImpl mostRecentlyCreated;
+
+        @Override public SocketImpl createSocketImpl() {
+            return mostRecentlyCreated = new CustomSocketImpl();
+        }
+    }
+
+    // Custom impl's
+    static class CustomSocketImpl extends SocketImpl {
+        // The only method interesting to this test.
+        @Override public Set<SocketOption<?>> supportedOptions() {
+            return super.supportedOptions();
+        }
+
+        public void create(boolean stream) throws IOException { }
+
+        public void connect(String host, int port) throws IOException { }
+
+        public void connect(InetAddress addr, int port) throws IOException { }
+
+        public void connect(SocketAddress addr, int timeout) throws IOException { }
+
+        public void bind(InetAddress host, int port) throws IOException { }
+
+        public void listen(int backlog) throws IOException { }
+
+        public void accept(SocketImpl s) throws IOException { }
+
+        public InputStream getInputStream() throws IOException { return null; }
+
+        public OutputStream getOutputStream() throws IOException { return null; }
+
+        public int available() throws IOException { return 0; }
+
+        public void close() throws IOException { }
+
+        public void sendUrgentData(int data) throws IOException { }
+
+        public Object getOption(int i) throws SocketException { return null; }
+
+        public void setOption(int i, Object o) throws SocketException { }
+    }
+
+    static class CustomDatagramSocketImpl extends DatagramSocketImpl {
+        // The only method interesting to this test.
+        @Override public Set<SocketOption<?>> supportedOptions() {
+            return super.supportedOptions();
+        }
+
+        protected void create() throws SocketException { }
+
+        protected void bind(int lport, InetAddress laddr) throws SocketException { }
+
+        protected void send(DatagramPacket p) throws IOException { }
+
+        protected int peek(InetAddress i) throws IOException { return 0; }
+
+        protected int peekData(DatagramPacket p) throws IOException { return 0; }
+
+        protected void receive(DatagramPacket p) throws IOException { }
+
+        protected void setTTL(byte ttl) throws IOException { }
+
+        protected byte getTTL() throws IOException { return 0; }
+
+        protected void setTimeToLive(int ttl) throws IOException { }
+
+        protected int getTimeToLive() throws IOException { return 0; }
+
+        protected void join(InetAddress inetaddr) throws IOException { }
+
+        protected void leave(InetAddress inetaddr) throws IOException { }
+
+        protected void joinGroup(SocketAddress x, NetworkInterface y)
+            throws IOException { }
+
+        protected void leaveGroup(SocketAddress x, NetworkInterface y)
+            throws IOException { }
+
+        protected void close() { }
+
+        public void setOption(int optID, Object value) throws SocketException { }
+
+        public Object getOption(int optID) throws SocketException { return null; }
+    }
+}