Deprecate JettyWebSocketClient in favor of StandardWebSocketClient

JettyWebSocketClient only supported on Jetty 11, to be phased out.

Closes gh-29576

spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/JettyWebSocketClient.java

@@ -39,6 +39,7 @@ import org.springframework.web.reactive.socket.adapter.JettyWebSocketSession;
 /**
  * A {@link WebSocketClient} implementation for use with Jetty
  * {@link org.eclipse.jetty.websocket.client.WebSocketClient}.
+ * Only supported on Jetty 11, superseded by {@link StandardWebSocketClient}.
  *
  * <p><strong>Note: </strong> the Jetty {@code WebSocketClient} requires
  * lifecycle management and must be started and stopped. This is automatically
@@ -49,7 +50,9 @@ import org.springframework.web.reactive.socket.adapter.JettyWebSocketSession;
  * @author Rossen Stoyanchev
  * @author Juergen Hoeller
  * @since 5.0
+ * @deprecated as of 6.0.3, in favor of {@link StandardWebSocketClient}
  */
+@Deprecated(since = "6.0.3", forRemoval = true)
 public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 
 	private static final Log logger = LogFactory.getLog(JettyWebSocketClient.class);

spring-webflux/src/test/java/org/springframework/web/reactive/socket/AbstractWebSocketIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * 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.
@@ -91,6 +91,7 @@ abstract class AbstractWebSocketIntegrationTests {
 
 	static Stream<Object[]> arguments() throws IOException {
 
+		@SuppressWarnings("removal")
 		WebSocketClient[] clients = new WebSocketClient[] {
 				new TomcatWebSocketClient(),
 				new JettyWebSocketClient(),

spring-websocket/src/main/java/org/springframework/web/socket/client/jetty/JettyWebSocketClient.java

@@ -45,7 +45,8 @@ import org.springframework.web.socket.client.AbstractWebSocketClient;
 
 /**
  * Initiates WebSocket requests to a WebSocket server programmatically
- * through the Jetty WebSocket API.
+ * through the Jetty WebSocket API. Only supported on Jetty 11, superseded by
+ * {@link org.springframework.web.socket.client.standard.StandardWebSocketClient}.
  *
  * <p>As of 4.1 this class implements {@link Lifecycle} rather than
  * {@link org.springframework.context.SmartLifecycle}. Use
@@ -55,7 +56,10 @@ import org.springframework.web.socket.client.AbstractWebSocketClient;
  * @author Rossen Stoyanchev
  * @author Juergen Hoeller
  * @since 4.0
+ * @deprecated as of 6.0.3, in favor of
+ * {@link org.springframework.web.socket.client.standard.StandardWebSocketClient}
  */
+@Deprecated(since = "6.0.3", forRemoval = true)
 public class JettyWebSocketClient extends AbstractWebSocketClient implements Lifecycle {
 
 	private final org.eclipse.jetty.websocket.client.WebSocketClient client;

spring-websocket/src/test/java/org/springframework/web/socket/AbstractWebSocketIntegrationTests.java

@@ -65,6 +65,7 @@ public abstract class AbstractWebSocketIntegrationTests {
 		upgradeStrategyConfigTypes.put(UndertowTestServer.class, UndertowUpgradeStrategyConfig.class);
 	}
 
+	@SuppressWarnings("removal")
 	static Stream<Arguments> argumentsFactory() {
 		return Stream.of(
 				arguments(named("Jetty", new JettyWebSocketTestServer()), named("Jetty", new JettyWebSocketClient())),

spring-websocket/src/test/java/org/springframework/web/socket/sockjs/client/JettySockJsIntegrationTests.java

@@ -42,6 +42,7 @@ class JettySockJsIntegrationTests extends AbstractSockJsIntegrationTests {
 		return new JettyWebSocketTestServer();
 	}
 
+	@SuppressWarnings("removal")
 	@Override
 	protected Transport createWebSocketTransport() {
 		return new WebSocketTransport(new JettyWebSocketClient());