FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+170-jigsaw-nightly-h6430-20170523)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+170-jigsaw-nightly-h6430-20170523, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Enabling TLS SNI extension in new Java 9 client seems not possible. (Package jdk.incubator.http)

Related: https://stackoverflow.com/questions/44479678/enable-tls-sni-in-new-java-9-client


ERROR MESSAGES/STACK TRACES THAT OCCUR :

javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure
at java.base/sun.security.ssl.Alerts.getSSLException(Alerts.java:198)
at java.base/sun.security.ssl.Alerts.getSSLException(Alerts.java:159)
at java.base/sun.security.ssl.SSLEngineImpl.recvAlert(SSLEngineImpl.java:1905)
at java.base/sun.security.ssl.SSLEngineImpl.processInputRecord(SSLEngineImpl.java:1140)
at java.base/sun.security.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.java:1020)
at java.base/sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.java:902)
at java.base/sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:680)
at java.base/javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:626)
at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.unwrapBuffer(AsyncSSLDelegate.java:476)
at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.handshakeReceiveAndUnWrap(AsyncSSLDelegate.java:395)
at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.doHandshakeImpl(AsyncSSLDelegate.java:294)
at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.doHandshakeNow(AsyncSSLDelegate.java:262)
at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.connect(AsyncSSLDelegate.java:233)
at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLConnection.connect(AsyncSSLConnection.java:78)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.<init>(Http2Connection.java:263)
at jdk.incubator.httpclient/jdk.incubator.http.Http2ClientImpl.getConnectionFor(Http2ClientImpl.java:108)
at jdk.incubator.httpclient/jdk.incubator.http.ExchangeImpl.get(ExchangeImpl.java:86)
at jdk.incubator.httpclient/jdk.incubator.http.Exchange.establishExchange(Exchange.java:272)
at jdk.incubator.httpclient/jdk.incubator.http.Exchange.responseImpl0(Exchange.java:283)
at jdk.incubator.httpclient/jdk.incubator.http.Exchange.responseImpl(Exchange.java:260)
at jdk.incubator.httpclient/jdk.incubator.http.Exchange.response(Exchange.java:136)
at jdk.incubator.httpclient/jdk.incubator.http.MultiExchange.response(MultiExchange.java:154)
at jdk.incubator.httpclient/jdk.incubator.http.HttpClientImpl.send(HttpClientImpl.java:234)
at CheckProj/Main.Main.lambda$main$0(Main.java:42)
at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073)
at jdk.incubator.httpclient/jdk.incubator.http.ResponseProcessors$ByteArrayProcessor.onComplete(ResponseProcessors.java:219)
at jdk.incubator.httpclient/jdk.incubator.http.BlockingPushPublisher.acceptData(BlockingPushPublisher.java:65)
at jdk.incubator.httpclient/jdk.incubator.http.AbstractPushPublisher.consume(AbstractPushPublisher.java:51)
at jdk.incubator.httpclient/jdk.incubator.http.ResponseContent.pushBodyChunked(ResponseContent.java:238)
at jdk.incubator.httpclient/jdk.incubator.http.ResponseContent.pushBody(ResponseContent.java:110)
at jdk.incubator.httpclient/jdk.incubator.http.Http1Response.lambda$readBody$2(Http1Response.java:157)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1161)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:844)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
HttpClient client = HttpClient.newHttpClient();
client.send(
       HttpRequest
           .newBuilder(new URI("https://www.classy.org/"))
           .GET()
           .build(),
       HttpResponse.BodyHandler.asString());
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Using legacy HttpURLConnection class.