Support for WebFlux on Reactor Netty 2 with Netty 5

See gh-28847

spring-web/src/testFixtures/java/org/springframework/web/testfixture/http/server/reactive/bootstrap/AbstractHttpHandlerIntegrationTests.java

@@ -127,6 +127,7 @@ public abstract class AbstractHttpHandlerIntegrationTests {
 		return Stream.of(
 				named("Jetty", new JettyHttpServer()),
 				named("Reactor Netty", new ReactorHttpServer()),
+				named("Reactor Netty 2", new ReactorHttpServer()),
 				named("Tomcat", new TomcatHttpServer()),
 				named("Undertow", new UndertowHttpServer())
 		);

spring-web/src/testFixtures/java/org/springframework/web/testfixture/http/server/reactive/bootstrap/ReactorNetty2HttpServer.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.testfixture.http.server.reactive.bootstrap;
+
+import java.net.InetSocketAddress;
+import java.util.concurrent.atomic.AtomicReference;
+
+import reactor.netty5.DisposableServer;
+
+import org.springframework.http.server.reactive.ReactorNetty2HttpHandlerAdapter;
+
+/**
+ * This class is copied from {@link ReactorHttpServer}.
+ *
+ * @author Violeta Georgieva
+ * @since 6.0
+ */
+public class ReactorNetty2HttpServer extends AbstractHttpServer {
+
+	private ReactorNetty2HttpHandlerAdapter reactorHandler;
+
+	private reactor.netty5.http.server.HttpServer reactorServer;
+
+	private AtomicReference<DisposableServer> serverRef = new AtomicReference<>();
+
+
+	@Override
+	protected void initServer() {
+		this.reactorHandler = createHttpHandlerAdapter();
+		this.reactorServer = reactor.netty5.http.server.HttpServer.create().wiretap(true)
+				.host(getHost()).port(getPort());
+	}
+
+	private ReactorNetty2HttpHandlerAdapter createHttpHandlerAdapter() {
+		return new ReactorNetty2HttpHandlerAdapter(resolveHttpHandler());
+	}
+
+	@Override
+	protected void startInternal() {
+		DisposableServer server = this.reactorServer.handle(this.reactorHandler).bind().block();
+		setPort(((InetSocketAddress) server.address()).getPort());
+		this.serverRef.set(server);
+	}
+
+	@Override
+	protected void stopInternal() {
+		this.serverRef.get().dispose();
+	}
+
+	@Override
+	protected void resetInternal() {
+		this.reactorServer = null;
+		this.reactorHandler = null;
+		this.serverRef.set(null);
+	}
+
+}

spring-web/src/testFixtures/java/org/springframework/web/testfixture/http/server/reactive/bootstrap/ReactorNetty2HttpsServer.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.testfixture.http.server.reactive.bootstrap;
+
+import java.net.InetSocketAddress;
+import java.util.concurrent.atomic.AtomicReference;
+
+import io.netty.handler.ssl.util.SelfSignedCertificate;
+import reactor.netty5.DisposableServer;
+import reactor.netty5.http.Http11SslContextSpec;
+
+import org.springframework.http.server.reactive.ReactorNetty2HttpHandlerAdapter;
+
+/**
+ * This class is copied from {@link ReactorHttpsServer}.
+ *
+ * @author Violeta Georgieva
+ * @since 6.0
+ */
+public class ReactorNetty2HttpsServer extends AbstractHttpServer {
+
+	private ReactorNetty2HttpHandlerAdapter reactorHandler;
+
+	private reactor.netty5.http.server.HttpServer reactorServer;
+
+	private AtomicReference<DisposableServer> serverRef = new AtomicReference<>();
+
+
+	@Override
+	protected void initServer() throws Exception {
+		SelfSignedCertificate cert = new SelfSignedCertificate();
+		Http11SslContextSpec http11SslContextSpec = Http11SslContextSpec.forServer(cert.certificate(), cert.privateKey());
+
+		this.reactorHandler = createHttpHandlerAdapter();
+		this.reactorServer = reactor.netty5.http.server.HttpServer.create()
+			.host(getHost())
+			.port(getPort())
+			.secure(sslContextSpec -> sslContextSpec.sslContext(http11SslContextSpec));
+	}
+
+	private ReactorNetty2HttpHandlerAdapter createHttpHandlerAdapter() {
+		return new ReactorNetty2HttpHandlerAdapter(resolveHttpHandler());
+	}
+
+	@Override
+	protected void startInternal() {
+		DisposableServer server = this.reactorServer.handle(this.reactorHandler).bind().block();
+		setPort(((InetSocketAddress) server.address()).getPort());
+		this.serverRef.set(server);
+	}
+
+	@Override
+	protected void stopInternal() {
+		this.serverRef.get().dispose();
+	}
+
+	@Override
+	protected void resetInternal() {
+		this.reactorServer = null;
+		this.reactorHandler = null;
+		this.serverRef.set(null);
+	}
+
+}