Skip TlsTest on old JDK 8 versions

Author: ejona86

okhttp/src/main/java/io/grpc/okhttp/OkHttpServerBuilder.java

@@ -519,8 +519,7 @@ private Socket apply(Socket s) throws IOException {
       return sslSocket;
     }
 
-    @Override
-    public Socket createSocket(Socket s, String host, int port, boolean autoClose)
+    @Override public Socket createSocket(Socket s, String host, int port, boolean autoClose)
         throws IOException {
       return apply(socketFactory.createSocket(s, host, port, autoClose));
     }

okhttp/src/test/java/io/grpc/okhttp/TlsTest.java

@@ -39,6 +39,10 @@
 import io.grpc.testing.protobuf.SimpleServiceGrpc;
 import java.io.IOException;
 import java.io.InputStream;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLEngine;
+import org.junit.Assume;
+import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -50,6 +54,20 @@ public class TlsTest {
   @Rule
   public final GrpcCleanupRule grpcCleanupRule = new GrpcCleanupRule();
 
+  @Before
+  public void checkForAlpnApi() throws Exception {
+    // This checks for the "Java 9 ALPN API" which was backported to Java 8u252. The Kokoro Windows
+    // CI is on too old of a JDK for us to assume this is available.
+    SSLContext context = SSLContext.getInstance("TLS");
+    context.init(null, null, null);
+    SSLEngine engine = context.createSSLEngine();
+    try {
+      SSLEngine.class.getMethod("getApplicationProtocol").invoke(engine);
+    } catch (NoSuchMethodException | UnsupportedOperationException ex) {
+      Assume.assumeNoException(ex);
+    }
+  }
+
   @Test
   public void mtls_succeeds() throws Exception {
     ServerCredentials serverCreds;