--- /dev/null	2018-06-20 11:01:03.657616567 -0700
+++ new/test/jdk/jdk/net/Sockets/rsocket/Selector/ByteServer.java	2018-06-22 12:24:03.878671740 -0700
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2002, 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.
+ */
+
+/**
+ * Utility class for tests. A simple "in-thread" server to accept connections
+ * and write bytes.
+ */
+
+import java.net.Socket;
+import java.net.ServerSocket;
+import java.net.SocketAddress;
+import java.net.InetSocketAddress;
+import java.net.InetAddress;
+import java.io.IOException;
+import java.io.Closeable;
+import jdk.net.Sockets;
+
+public class ByteServer implements Closeable {
+
+    private final ServerSocket ss;
+    private Socket s;
+
+    ByteServer() throws IOException {
+        ServerSocket ss = Sockets.openRdmaServerSocket();
+        ss.bind(new InetSocketAddress(InetAddress.getLocalHost(), 0));
+        this.ss = ss;
+    }
+
+    SocketAddress address() {
+        return new InetSocketAddress(ss.getInetAddress(), ss.getLocalPort());
+    }
+
+    void acceptConnection() throws IOException {
+        if (s != null)
+            throw new IllegalStateException("already connected");
+        this.s = ss.accept();
+    }
+
+    void closeConnection() throws IOException {
+        Socket s = this.s;
+        if (s != null) {
+            this.s = null;
+            s.close();
+        }
+    }
+
+    void write(int count) throws IOException {
+        if (s == null)
+            throw new IllegalStateException("no connection");
+        s.getOutputStream().write(new byte[count]);
+    }
+
+    public void close() throws IOException {
+        if (s != null)
+            s.close();
+        ss.close();
+    }
+}