--- a/src/share/classes/sun/security/ssl/SupportedEllipticCurvesExtension.java	Thu Feb 09 16:34:22 2017 +0000
+++ b/src/share/classes/sun/security/ssl/SupportedEllipticCurvesExtension.java	Fri Apr 21 07:20:10 2017 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2017, 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
@@ -43,6 +43,9 @@
 
 final class SupportedEllipticCurvesExtension extends HelloExtension {
 
+    /* Class and subclass dynamic debugging support */
+    private static final Debug debug = Debug.getInstance("ssl");
+
     private static final int ARBITRARY_PRIME = 0xff01;
     private static final int ARBITRARY_CHAR2 = 0xff02;
 
@@ -159,6 +162,11 @@
                     }   // ignore unknown curves
                 }
             }
+            if (idList.isEmpty() && JsseJce.isEcAvailable()) {
+                throw new IllegalArgumentException(
+                    "System property jdk.tls.namedGroups(" + property + ") " +
+                    "contains no supported elliptic curves");
+            }
         } else {        // default curves
             int[] ids;
             if (requireFips) {
@@ -183,18 +191,19 @@
             }
         }
 
-        if (idList.isEmpty()) {
-            throw new IllegalArgumentException(
-                "System property jdk.tls.namedGroups(" + property + ") " +
-                "contains no supported elliptic curves");
-        } else {
+        if (debug != null && idList.isEmpty()) {
+            debug.println(
+                "Initialized [jdk.tls.namedGroups|default] list contains " +
+                "no available elliptic curves. " +
+                (property != null ? "(" + property + ")" : "[Default]"));
+        }
+
             supportedCurveIds = new int[idList.size()];
             int i = 0;
             for (Integer id : idList) {
                 supportedCurveIds[i++] = id;
             }
         }
-    }
 
     // check whether the curve is supported by the underlying providers
     private static boolean isAvailableCurve(int curveId) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/sun/security/ssl/ServerHandshaker/HelloExtensionsTest.java	Fri Apr 21 07:20:10 2017 +0100
@@ -0,0 +1,287 @@
+/*
+ * Copyright (c) 2017, 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 8173783
+ * @summary 6u141 IllegalArgumentException: jdk.tls.namedGroups
+ * @run main/othervm HelloExtensionsTest
+ * @run main/othervm HelloExtensionsTest -Djdk.tls.namedGroups="bug, bug"
+ * @run main/othervm HelloExtensionsTest -Djdk.tls.namedGroups="secp521r1"
+ *
+ */
+import javax.crypto.*;
+import javax.net.ssl.*;
+import javax.net.ssl.SSLEngineResult.*;
+import java.io.*;
+import java.nio.*;
+import java.security.*;
+
+public class HelloExtensionsTest {
+
+    private static boolean debug = false;
+    private static boolean proceed = true;
+    private static boolean EcAvailable = isEcAvailable();
+
+    static String pathToStores = "../etc";
+    private static String keyStoreFile = "keystore";
+    private static String trustStoreFile = "truststore";
+    private static String passwd = "passphrase";
+
+    private static String keyFilename =
+            System.getProperty("test.src", "./") + "/" + pathToStores +
+                "/" + keyStoreFile;
+    private static String trustFilename =
+            System.getProperty("test.src", "./") + "/" + pathToStores +
+                "/" + trustStoreFile;
+
+    private static void checkDone(SSLEngine ssle) throws Exception {
+        if (!ssle.isInboundDone()) {
+            throw new Exception("isInboundDone isn't done");
+        }
+        if (!ssle.isOutboundDone()) {
+            throw new Exception("isOutboundDone isn't done");
+        }
+    }
+
+    private static void runTest(SSLEngine ssle) throws Exception {
+
+         /*
+
+         A client hello message captured via wireshark by selecting
+         a TLSv1.2 Client Hello record and clicking through to the
+         TLSv1.2 Record Layer line and then selecting the hex stream
+         via "copy -> bytes -> hex stream".
+
+         For Record purposes, here's the ClientHello :
+
+         *** ClientHello, TLSv1.2
+         RandomCookie:  GMT: 1469560450 bytes = { 108, 140, 12, 202,
+         2, 213, 10, 236, 143, 223, 58, 162, 228, 155, 239, 3, 98,
+         232, 89, 41, 116, 120, 13, 37, 105, 153, 97, 241 }
+         Session ID:  {}
+         Cipher Suites: [TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
+         TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA256,
+         TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
+         TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
+         TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
+         TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,
+         TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+         TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+         TLS_RSA_WITH_AES_128_CBC_SHA,
+         TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
+         TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
+         TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
+         TLS_DHE_DSS_WITH_AES_128_CBC_SHA,
+         TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+         TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+         TLS_RSA_WITH_AES_128_GCM_SHA256,
+         TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
+         TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
+         TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
+         TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,
+         TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
+         TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+         SSL_RSA_WITH_3DES_EDE_CBC_SHA,
+         TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
+         TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
+         SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
+         SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
+         TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
+         Compression Methods:  { 0 }
+         Extension elliptic_curves, curve names: {secp256r1,
+         sect163k1, sect163r2, secp192r1, secp224r1, sect233k1, sect233r1,
+         sect283k1, sect283r1, secp384r1, sect409k1, sect409r1, secp521r1,
+         sect571k1, sect571r1, secp160k1, secp160r1, secp160r2, sect163r1,
+         secp192k1, sect193r1, sect193r2, secp224k1, sect239k1, secp256k1}
+         Extension ec_point_formats, formats: [uncompressed]
+         Extension signature_algorithms, signature_algorithms:
+         SHA512withECDSA, SHA512withRSA, SHA384withECDSA, SHA384withRSA,
+         SHA256withECDSA, SHA256withRSA, Unknown (hash:0x3, signature:0x3),
+         Unknown (hash:0x3, signature:0x1), SHA1withECDSA,
+         SHA1withRSA, SHA1withDSA
+         Extension server_name, server_name:
+         [host_name: bugs.openjdk.java.net]
+         */
+
+        String hello = "16030300df010000db03035898b7826c8c0cc" +
+            "a02d50aec8fdf3aa2e49bef0362e8592974780d25699961f" +
+            "100003ac023c027003cc025c02900670040c009c013002fc" +
+            "004c00e00330032c02bc02f009cc02dc031009e00a2c008c" +
+            "012000ac003c00d0016001300ff01000078000a003400320" +
+            "0170001000300130015000600070009000a0018000b000c0" +
+            "019000d000e000f001000110002001200040005001400080" +
+            "016000b00020100000d00180016060306010503050104030" +
+            "401030303010203020102020000001a00180000156275677" +
+            "32e6f70656e6a646b2e6a6176612e6e6574";
+
+        byte[] msg_clihello = hexStringToByteArray(hello);
+        ByteBuffer bf_clihello = ByteBuffer.wrap(msg_clihello);
+
+        SSLSession session = ssle.getSession();
+        int appBufferMax = session.getApplicationBufferSize();
+        int netBufferMax = session.getPacketBufferSize();
+
+        ByteBuffer serverIn = ByteBuffer.allocate(appBufferMax + 50);
+        ByteBuffer serverOut = ByteBuffer.wrap("I'm Server".getBytes());
+        ByteBuffer sTOc = ByteBuffer.allocate(netBufferMax);
+
+        ssle.beginHandshake();
+
+        // unwrap the clientHello message.
+        SSLEngineResult result = ssle.unwrap(bf_clihello, serverIn);
+        System.out.println("server unwrap " + result);
+        runDelegatedTasks(result, ssle);
+
+        if (!proceed) {
+            //expected exception occurred. Don't process anymore
+            return;
+        }
+
+        // one more step, ensure the clientHello message is parsed.
+        SSLEngineResult.HandshakeStatus status = ssle.getHandshakeStatus();
+        if ( status == HandshakeStatus.NEED_UNWRAP) {
+            result = ssle.unwrap(bf_clihello, serverIn);
+            System.out.println("server unwrap " + result);
+            runDelegatedTasks(result, ssle);
+        } else if ( status == HandshakeStatus.NEED_WRAP) {
+            result = ssle.wrap(serverOut, sTOc);
+            System.out.println("server wrap " + result);
+            runDelegatedTasks(result, ssle);
+        } else {
+            throw new Exception("unexpected handshake status " + status);
+        }
+
+        // enough, stop
+    }
+
+    /*
+     * If the result indicates that we have outstanding tasks to do,
+     * go ahead and run them in this thread.
+     */
+    private static void runDelegatedTasks(SSLEngineResult result,
+            SSLEngine engine) throws Exception {
+
+        if (result.getHandshakeStatus() == HandshakeStatus.NEED_TASK) {
+            Runnable runnable;
+            try {
+                while ((runnable = engine.getDelegatedTask()) != null) {
+                    log("\trunning delegated task...");
+                    runnable.run();
+                }
+            } catch (ExceptionInInitializerError e) {
+                String v = System.getProperty("jdk.tls.namedGroups");
+                if (!EcAvailable || v == null) {
+                    // we weren't expecting this if no EC providers
+                    throw new RuntimeException("Unexpected Error :" + e);
+                }
+                if (v != null && v.contains("bug")) {
+                    // OK - we were expecting this Error
+                    log("got expected error for bad jdk.tls.namedGroups");
+                    proceed = false;
+                    return;
+                } else {
+                    System.out.println("Unexpected error. " +
+                        "jdk.tls.namedGroups value: " + v);
+                    throw e;
+                }
+            }
+            HandshakeStatus hsStatus = engine.getHandshakeStatus();
+            if (hsStatus == HandshakeStatus.NEED_TASK) {
+                throw new Exception(
+                    "handshake shouldn't need additional tasks");
+            }
+            log("\tnew HandshakeStatus: " + hsStatus);
+        }
+    }
+
+    private static byte[] hexStringToByteArray(String s) {
+        int len = s.length();
+        byte[] data = new byte[len / 2];
+        for (int i = 0; i < len; i += 2) {
+            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+                + Character.digit(s.charAt(i+1), 16));
+        }
+        return data;
+    }
+
+    private static boolean isEcAvailable() {
+        try {
+            Signature.getInstance("SHA1withECDSA");
+            Signature.getInstance("NONEwithECDSA");
+            KeyAgreement.getInstance("ECDH");
+            KeyFactory.getInstance("EC");
+            KeyPairGenerator.getInstance("EC");
+            AlgorithmParameters.getInstance("EC");
+        } catch (Exception e) {
+            log("EC not available. Received: " + e);
+            return false;
+        }
+        return true;
+    }
+
+    public static void main(String args[]) throws Exception {
+        SSLEngine ssle = createSSLEngine(keyFilename, trustFilename);
+        runTest(ssle);
+        System.out.println("Test Passed.");
+    }
+
+    /*
+     * Create an initialized SSLContext to use for this test.
+     */
+    static private SSLEngine createSSLEngine(String keyFile, String trustFile)
+            throws Exception {
+
+        SSLEngine ssle;
+
+        KeyStore ks = KeyStore.getInstance("JKS");
+        KeyStore ts = KeyStore.getInstance("JKS");
+
+        char[] passphrase = "passphrase".toCharArray();
+
+        ks.load(new FileInputStream(keyFile), passphrase);
+        ts.load(new FileInputStream(trustFile), passphrase);
+
+        KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
+        kmf.init(ks, passphrase);
+
+        TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
+        tmf.init(ts);
+
+        SSLContext sslCtx = SSLContext.getInstance("TLS");
+
+        sslCtx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
+
+        ssle = sslCtx.createSSLEngine();
+        ssle.setUseClientMode(false);
+
+        return ssle;
+    }
+
+
+    private static void log(String str) {
+        if (debug) {
+            System.out.println(str);
+        }
+    }
+}