--- /dev/null	2020-08-26 14:45:40.000000000 +0100
+++ new/src/java.base/share/classes/sun/nio/ch/InetServerSocketChannelImpl.java	2020-08-26 14:45:40.000000000 +0100
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2000, 2019, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package sun.nio.ch;
+
+import java.io.FileDescriptor;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.ProtocolFamily;
+import java.net.StandardProtocolFamily;
+import java.net.ServerSocket;
+import java.net.SocketAddress;
+import java.net.SocketOption;
+import java.net.SocketTimeoutException;
+import java.net.StandardSocketOptions;
+import java.nio.channels.AlreadyBoundException;
+import java.nio.channels.AsynchronousCloseException;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.IllegalBlockingModeException;
+import java.nio.channels.NotYetBoundException;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+import java.nio.channels.spi.SelectorProvider;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.locks.ReentrantLock;
+
+import sun.net.NetHooks;
+import sun.net.ext.ExtendedSocketOptions;
+
+/**
+ * An implementation of ServerSocketChannels
+ */
+
+class InetServerSocketChannelImpl
+    extends ServerSocketChannelImpl
+{
+    // set true when exclusive binding is on and SO_REUSEADDR is emulated
+    private boolean isReuseAddress;
+
+    // -- End of fields protected by stateLock
+
+    // the protocol family requested by the user, or Net.UNSPEC if not specified
+    private final ProtocolFamily family;
+
+    InetServerSocketChannelImpl(SelectorProvider sp) throws IOException {
+        this(sp, Net.isIPv6Available()
+                ? StandardProtocolFamily.INET6
+                : StandardProtocolFamily.INET);
+    }
+
+    InetServerSocketChannelImpl(SelectorProvider sp, ProtocolFamily family)
+        throws IOException
+    {
+        super(sp, Net.serverSocket(family, true), false);
+        this.family = family;
+    }
+
+    InetServerSocketChannelImpl(SelectorProvider sp, FileDescriptor fd, boolean bound)
+        throws IOException
+    {
+        super(sp, fd, bound);
+        this.family =  Net.isIPv6Available()
+                ? StandardProtocolFamily.INET6
+                : StandardProtocolFamily.INET;
+    }
+
+
+    InetSocketAddress implLocalAddress(FileDescriptor fd) throws IOException {
+        return Net.localAddress(fd);
+    }
+
+    @Override
+    <T> void implSetOption(SocketOption<T> name, T value) throws IOException {
+        if (name == StandardSocketOptions.SO_REUSEADDR && Net.useExclusiveBind()) {
+            // SO_REUSEADDR emulated when using exclusive bind
+            isReuseAddress = (Boolean) value;
+        } else {
+            Net.setSocketOption(getFD(), Net.UNSPEC, name, value);
+        }
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    <T> T implGetOption(SocketOption<T> name) throws IOException {
+        if (name == StandardSocketOptions.SO_REUSEADDR && Net.useExclusiveBind()) {
+            // SO_REUSEADDR emulated when using exclusive bind
+            return (T) Boolean.valueOf(isReuseAddress);
+        }
+        return (T) Net.getSocketOption(getFD(), Net.UNSPEC, name);
+    }
+
+    private static class DefaultOptionsHolder {
+        static final Set<SocketOption<?>> defaultOptions = defaultOptions();
+
+        private static Set<SocketOption<?>> defaultOptions() {
+            HashSet<SocketOption<?>> set = new HashSet<>();
+            set.add(StandardSocketOptions.SO_RCVBUF);
+            set.add(StandardSocketOptions.SO_REUSEADDR);
+            if (Net.isReusePortAvailable()) {
+                set.add(StandardSocketOptions.SO_REUSEPORT);
+            }
+            set.addAll(ExtendedSocketOptions.serverSocketOptions());
+            return Collections.unmodifiableSet(set);
+        }
+    }
+
+    @Override
+    public final Set<SocketOption<?>> supportedOptions() {
+        return DefaultOptionsHolder.defaultOptions;
+    }
+
+    @Override
+    SocketAddress implBind(SocketAddress local, int backlog) throws IOException {
+        InetSocketAddress isa;
+        if (local == null) {
+            isa = new InetSocketAddress(Net.anyLocalAddress(family), 0);
+        } else {
+            isa = Net.checkAddress(local, family);
+        }
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null)
+            sm.checkListen(isa.getPort());
+        NetHooks.beforeTcpBind(getFD(), isa.getAddress(), isa.getPort());
+        Net.bind(family, getFD(), isa.getAddress(), isa.getPort());
+        Net.listen(getFD(), backlog < 1 ? 50 : backlog);
+        return Net.localAddress(getFD());
+    }
+
+    protected int implAccept(FileDescriptor fd, FileDescriptor newfd, SocketAddress[] addrs)
+        throws IOException
+    {
+        InetSocketAddress[] a = new InetSocketAddress[1];
+        int n = Net.accept(fd, newfd, a);
+        addrs[0] = a[0];
+        return n;
+    }
+
+    protected SocketAddress getRevealedLocalAddress(SocketAddress addr) {
+        return Net.getRevealedLocalAddress((InetSocketAddress)addr);
+    }
+
+    protected String getRevealedLocalAddressAsString(SocketAddress addr) {
+        return Net.getRevealedLocalAddressAsString((InetSocketAddress)addr);
+    }
+
+    /**
+     * Returns the local address, or null if not bound
+     */
+    InetSocketAddress localAddress() {
+        return (InetSocketAddress)super.localAddress();
+    }
+
+    protected SocketChannel implFinishAccept(FileDescriptor newfd, SocketAddress sa)
+        throws IOException
+    {
+        InetSocketAddress isa = (InetSocketAddress)sa;
+        // check permitted to accept connections from the remote address
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkAccept(isa.getAddress().getHostAddress(), isa.getPort());
+        }
+        return new InetSocketChannelImpl(provider(), family, newfd, isa);
+    }
+}