Setting the right channel

Author: franz1981

extensions/grpc/runtime/src/main/java/io/quarkus/grpc/runtime/supports/Channels.java

@@ -27,6 +27,7 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
+import io.netty.channel.socket.nio.NioSocketChannel;
 import jakarta.enterprise.context.spi.CreationalContext;
 import jakarta.enterprise.inject.Any;
 import jakarta.enterprise.util.TypeLiteral;
@@ -210,14 +211,16 @@ public static Channel createChannel(String name, Set<String> perClientIntercepto
                 NettyChannelBuilder ncBuilder = (NettyChannelBuilder) builder;
                 // just use the existing Vertx event loop group, if possible
                 Vertx vertx = container.instance(Vertx.class).get();
-                if (vertx != null) {
+                // only support NIO for now, since Vertx::transport is not exposed in the API
+                if (vertx != null && vertx.isNativeTransportEnabled()) {
                     // see https://github.com/eclipse-vertx/vert.x/pull/5292
                     boolean reuseNettyAllocators = Boolean.getBoolean("vertx.reuseNettyAllocators");
                     if (reuseNettyAllocators) {
                         // let Netty Grpc to re-use the default Netty allocator as well
                         System.setProperty("io.grpc.netty.useCustomAllocator", "false");
                     }
-                    ncBuilder = ncBuilder.eventLoopGroup(vertx.nettyEventLoopGroup());
+                    ncBuilder = ncBuilder.eventLoopGroup(vertx.nettyEventLoopGroup())
+                            .channelType(NioSocketChannel.class);
                 }
                 builder = ncBuilder
                         // clients are intercepted using the IOThreadClientInterceptor interceptor which will decide on which