title: Even after setting jsse.enableSNIExtension to true, enableSNIExtension in ClientHandshaker has value false
body: <p>I am trying to enable the SNI extension in my project. I set <code>jsse.enableSNIExtension</code> property by following ways: 
  <code>
  1. Writing System.setProperty("jsse.enableSNIExtension", "true");
  2. Passing -Djsse.enableSNIExtension=true as VM argument</code></p>
  
  <p>I printed the value of above property after application is started and the value printed is true however when the tlsv1.2 tries to establish the handshake with the server, the field in <code>sun.security.ssl.ClientHandshaker.java</code> <code>private static final boolean enableSNIExtension = Debug.getBooleanProperty("jsse.enableSNIExtension", true);</code> has value false which ultimately results in SNI header not being included in the extensions</p>
  
  <p>The logs print this:</p>
  
  <pre><code>http-nio-9113-exec-2, setSoTimeout(60000) called
  http-nio-9113-exec-2, the previous server name in SNI (type=host_name (0), value=xxx.yyy.zzz.com) was replaced with (type=host_name (0), value=xxx.yyy.zzz.com)
  Ignoring unsupported cipher suite: TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 for TLSv1
  .
  .
  Ignoring unsupported cipher suite: TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 for TLSv1.1
  %% No cached client session
  update handshake state: client_hello[1]
  upcoming handshake states: server_hello[2]
  *** ClientHello, TLSv1.2
  RandomCookie:  GMT: 1558202243 bytes = { 110, 67, 239, 138, 239, 2, 107, 13, 194, 64, 33, 49, 50, 105, 199, 255, 255, 238, 186, 205, 18, 178, 196, 116, 148, 207, 115, 200 }
  Session ID:  {}
  Cipher Suites: [TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384, .... TLS_DHE_DSS_WITH_AES_128_GCM_SHA256]
  Compression Methods:  { 0 }
  Extension elliptic_curves, curve names: {secp256r1, secp384r1, secp521r1, sect283k1, sect283r1, sect409k1, sect409r1, sect571k1, sect571r1, secp256k1}
  Extension ec_point_formats, formats: [uncompressed]
  Extension signature_algorithms, signature_algorithms: SHA512withECDSA, SHA512withRSA, SHA384withECDSA, SHA384withRSA, SHA256withECDSA, SHA256withRSA, SHA256withDSA, SHA224withECDSA, SHA224withRSA, SHA224withDSA, SHA1withECDSA, SHA1withRSA, SHA1withDSA
  Extension extended_master_secret
  Extension renegotiation_info, renegotiated_connection: &lt;empty&gt;
  ***
  
  When getKickstartMessage() method is called in ClientHandshake.java, enableSNIExtension is set to false and hence serverNames is not set and requestedServerNames remains null.
                  if (enableSNIExtension) {
                      if (this.session != null) {
                          this.requestedServerNames = this.session.getRequestedServerNames();
                      } else {
                          this.requestedServerNames = this.serverNames;
                      }
  
                      if (!this.requestedServerNames.isEmpty()) {
                          var11.addSNIExtension(this.requestedServerNames);
                      }
                  }
  </code></pre>
  
  <p>Please help to solve this problem. Any leads are appreciated.</p>