Support for Jetty 10

Closes gh-26123

spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -16,11 +16,13 @@
 
 package org.springframework.http.client.reactive;
 
+import java.lang.reflect.Method;
 import java.net.HttpCookie;
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import org.eclipse.jetty.client.api.Response;
 import org.eclipse.jetty.reactive.client.ReactiveResponse;
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
@@ -30,9 +32,11 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseCookie;
 import org.springframework.lang.Nullable;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
+import org.springframework.util.ReflectionUtils;
 
 /**
  * {@link ClientHttpResponse} implementation for the Jetty ReactiveStreams HTTP client.
@@ -46,6 +50,11 @@ class JettyClientHttpResponse implements ClientHttpResponse {
 
 	private static final Pattern SAMESITE_PATTERN = Pattern.compile("(?i).*SameSite=(Strict|Lax|None).*");
 
+	private static final ClassLoader loader = JettyClientHttpResponse.class.getClassLoader();
+
+	private static final boolean jetty10Present = ClassUtils.isPresent(
+			"org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer", loader);
+
 
 	private final ReactiveResponse reactiveResponse;
 
@@ -58,8 +67,11 @@ class JettyClientHttpResponse implements ClientHttpResponse {
 		this.reactiveResponse = reactiveResponse;
 		this.content = Flux.from(content);
 
-		MultiValueMap<String, String> adapter = new JettyHeadersAdapter(reactiveResponse.getHeaders());
-		this.headers = HttpHeaders.readOnlyHttpHeaders(adapter);
+		MultiValueMap<String, String> headers = (jetty10Present ?
+				Jetty10HttpFieldsHelper.getHttpHeaders(reactiveResponse) :
+				new JettyHeadersAdapter(reactiveResponse.getHeaders()));
+
+		this.headers = HttpHeaders.readOnlyHttpHeaders(headers);
 	}
 
 
@@ -110,4 +122,38 @@ class JettyClientHttpResponse implements ClientHttpResponse {
 		return this.headers;
 	}
 
+
+	private static class Jetty10HttpFieldsHelper {
+
+		private static final Method getHeadersMethod;
+
+		private static final Method getNameMethod;
+
+		private static final Method getValueMethod;
+
+		static {
+			try {
+				getHeadersMethod = Response.class.getMethod("getHeaders");
+				Class<?> type = loader.loadClass("org.eclipse.jetty.http.HttpField");
+				getNameMethod = type.getMethod("getName");
+				getValueMethod = type.getMethod("getValue");
+			}
+			catch (ClassNotFoundException | NoSuchMethodException ex) {
+				throw new IllegalStateException("No compatible Jetty version found", ex);
+			}
+		}
+
+		public static HttpHeaders getHttpHeaders(ReactiveResponse response) {
+			HttpHeaders headers = new HttpHeaders();
+			Iterable<?> iterator = (Iterable<?>)
+					ReflectionUtils.invokeMethod(getHeadersMethod, response.getResponse());
+			for (Object field : iterator) {
+				headers.add(
+						(String) ReflectionUtils.invokeMethod(getNameMethod, field),
+						(String) ReflectionUtils.invokeMethod(getValueMethod, field));
+			}
+			return headers;
+		}
+	}
+
 }

spring-web/src/main/java/org/springframework/http/server/reactive/JettyHttpHandlerAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -36,6 +36,7 @@ import org.springframework.core.io.buffer.DataBufferFactory;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.MultiValueMap;
 
 /**
@@ -49,6 +50,10 @@ import org.springframework.util.MultiValueMap;
  */
 public class JettyHttpHandlerAdapter extends ServletHttpHandlerAdapter {
 
+	private static final boolean jetty10Present = ClassUtils.isPresent(
+			"org.eclipse.jetty.http.CookieCutter", JettyHttpHandlerAdapter.class.getClassLoader());
+
+
 	public JettyHttpHandlerAdapter(HttpHandler httpHandler) {
 		super(httpHandler);
 	}
@@ -58,16 +63,29 @@ public class JettyHttpHandlerAdapter extends ServletHttpHandlerAdapter {
 	protected ServletServerHttpRequest createRequest(HttpServletRequest request, AsyncContext context)
 			throws IOException, URISyntaxException {
 
+		// TODO: need to compile against Jetty 10 to use HttpFields (class->interface)
+		if (jetty10Present) {
+			return super.createRequest(request, context);
+		}
+
 		Assert.notNull(getServletPath(), "Servlet path is not initialized");
-		return new JettyServerHttpRequest(request, context, getServletPath(), getDataBufferFactory(), getBufferSize());
+		return new JettyServerHttpRequest(
+				request, context, getServletPath(), getDataBufferFactory(), getBufferSize());
 	}
 
 	@Override
 	protected ServletServerHttpResponse createResponse(HttpServletResponse response,
 			AsyncContext context, ServletServerHttpRequest request) throws IOException {
 
-		return new JettyServerHttpResponse(
-				response, context, getDataBufferFactory(), getBufferSize(), request);
+		// TODO: need to compile against Jetty 10 to use HttpFields (class->interface)
+		if (jetty10Present) {
+			return new BaseJettyServerHttpResponse(
+					response, context, getDataBufferFactory(), getBufferSize(), request);
+		}
+		else {
+			return new JettyServerHttpResponse(
+					response, context, getDataBufferFactory(), getBufferSize(), request);
+		}
 	}
 
 
@@ -87,7 +105,34 @@ public class JettyHttpHandlerAdapter extends ServletHttpHandlerAdapter {
 	}
 
 
-	private static final class JettyServerHttpResponse extends ServletServerHttpResponse {
+	private static class BaseJettyServerHttpResponse extends ServletServerHttpResponse {
+
+		BaseJettyServerHttpResponse(HttpServletResponse response, AsyncContext asyncContext,
+				DataBufferFactory bufferFactory, int bufferSize, ServletServerHttpRequest request)
+				throws IOException {
+
+			super(response, asyncContext, bufferFactory, bufferSize, request);
+		}
+
+		BaseJettyServerHttpResponse(HttpHeaders headers, HttpServletResponse response, AsyncContext asyncContext,
+				DataBufferFactory bufferFactory, int bufferSize, ServletServerHttpRequest request)
+				throws IOException {
+
+			super(headers, response, asyncContext, bufferFactory, bufferSize, request);
+		}
+
+		@Override
+		protected int writeToOutputStream(DataBuffer dataBuffer) throws IOException {
+			ByteBuffer input = dataBuffer.asByteBuffer();
+			int len = input.remaining();
+			ServletResponse response = getNativeResponse();
+			((HttpOutput) response.getOutputStream()).write(input);
+			return len;
+		}
+	}
+
+
+	private static final class JettyServerHttpResponse extends BaseJettyServerHttpResponse {
 
 		JettyServerHttpResponse(HttpServletResponse response, AsyncContext asyncContext,
 				DataBufferFactory bufferFactory, int bufferSize, ServletServerHttpRequest request)
@@ -124,15 +169,6 @@ public class JettyHttpHandlerAdapter extends ServletHttpHandlerAdapter {
 				response.setContentLengthLong(contentLength);
 			}
 		}
-
-		@Override
-		protected int writeToOutputStream(DataBuffer dataBuffer) throws IOException {
-			ByteBuffer input = dataBuffer.asByteBuffer();
-			int len = input.remaining();
-			ServletResponse response = getNativeResponse();
-			((HttpOutput) response.getOutputStream()).write(input);
-			return len;
-		}
 	}
 
 }

spring-webflux/src/main/java/org/springframework/web/reactive/socket/adapter/Jetty10WebSocketHandlerAdapter.java

@@ -0,0 +1,147 @@
+/*
+ * Copyright 2002-2021 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.reactive.socket.adapter;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.function.Function;
+
+import org.eclipse.jetty.websocket.api.Session;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketError;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
+import org.eclipse.jetty.websocket.api.annotations.WebSocket;
+import org.eclipse.jetty.websocket.api.extensions.Frame;
+
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
+import org.springframework.web.reactive.socket.CloseStatus;
+import org.springframework.web.reactive.socket.WebSocketHandler;
+import org.springframework.web.reactive.socket.WebSocketMessage;
+import org.springframework.web.reactive.socket.WebSocketMessage.Type;
+import org.springframework.web.reactive.socket.WebSocketSession;
+
+/**
+ * Identical to {@link JettyWebSocketHandlerAdapter}, only excluding the
+ * {@code onWebSocketFrame} method, since the {@link Frame} argument has moved
+ * to a different package in Jetty 10.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.3.4
+ */
+@WebSocket
+public class Jetty10WebSocketHandlerAdapter {
+
+	private static final ByteBuffer EMPTY_PAYLOAD = ByteBuffer.wrap(new byte[0]);
+
+
+	private final WebSocketHandler delegateHandler;
+
+	private final Function<Session, JettyWebSocketSession> sessionFactory;
+
+	@Nullable
+	private JettyWebSocketSession delegateSession;
+
+
+	public Jetty10WebSocketHandlerAdapter(WebSocketHandler handler,
+			Function<Session, JettyWebSocketSession> sessionFactory) {
+
+		Assert.notNull(handler, "WebSocketHandler is required");
+		Assert.notNull(sessionFactory, "'sessionFactory' is required");
+		this.delegateHandler = handler;
+		this.sessionFactory = sessionFactory;
+	}
+
+
+	@OnWebSocketConnect
+	public void onWebSocketConnect(Session session) {
+		this.delegateSession = this.sessionFactory.apply(session);
+		this.delegateHandler.handle(this.delegateSession)
+				.checkpoint(session.getUpgradeRequest().getRequestURI() + " [JettyWebSocketHandlerAdapter]")
+				.subscribe(this.delegateSession);
+	}
+
+	@OnWebSocketMessage
+	public void onWebSocketText(String message) {
+		if (this.delegateSession != null) {
+			WebSocketMessage webSocketMessage = toMessage(Type.TEXT, message);
+			this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
+		}
+	}
+
+	@OnWebSocketMessage
+	public void onWebSocketBinary(byte[] message, int offset, int length) {
+		if (this.delegateSession != null) {
+			ByteBuffer buffer = ByteBuffer.wrap(message, offset, length);
+			WebSocketMessage webSocketMessage = toMessage(Type.BINARY, buffer);
+			this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
+		}
+	}
+
+// TODO: onWebSocketFrame can't be declared without compiling against Jetty 10
+//   Jetty 10: org.eclipse.jetty.websocket.api.Frame
+//   Jetty  9: org.eclipse.jetty.websocket.api.extensions.Frame
+
+//	@OnWebSocketFrame
+//	public void onWebSocketFrame(Frame frame) {
+//		if (this.delegateSession != null) {
+//			if (OpCode.PONG == frame.getOpCode()) {
+//				ByteBuffer buffer = (frame.getPayload() != null ? frame.getPayload() : EMPTY_PAYLOAD);
+//				WebSocketMessage webSocketMessage = toMessage(Type.PONG, buffer);
+//				this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
+//			}
+//		}
+//	}
+
+	private <T> WebSocketMessage toMessage(Type type, T message) {
+		WebSocketSession session = this.delegateSession;
+		Assert.state(session != null, "Cannot create message without a session");
+		if (Type.TEXT.equals(type)) {
+			byte[] bytes = ((String) message).getBytes(StandardCharsets.UTF_8);
+			DataBuffer buffer = session.bufferFactory().wrap(bytes);
+			return new WebSocketMessage(Type.TEXT, buffer);
+		}
+		else if (Type.BINARY.equals(type)) {
+			DataBuffer buffer = session.bufferFactory().wrap((ByteBuffer) message);
+			return new WebSocketMessage(Type.BINARY, buffer);
+		}
+		else if (Type.PONG.equals(type)) {
+			DataBuffer buffer = session.bufferFactory().wrap((ByteBuffer) message);
+			return new WebSocketMessage(Type.PONG, buffer);
+		}
+		else {
+			throw new IllegalArgumentException("Unexpected message type: " + message);
+		}
+	}
+
+	@OnWebSocketClose
+	public void onWebSocketClose(int statusCode, String reason) {
+		if (this.delegateSession != null) {
+			this.delegateSession.handleClose(CloseStatus.create(statusCode, reason));
+		}
+	}
+
+	@OnWebSocketError
+	public void onWebSocketError(Throwable cause) {
+		if (this.delegateSession != null) {
+			this.delegateSession.handleError(cause);
+		}
+	}
+
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -17,7 +17,9 @@
 package org.springframework.web.reactive.socket.client;
 
 import java.io.IOException;
+import java.lang.reflect.Method;
 import java.net.URI;
+import java.util.function.Function;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -32,9 +34,12 @@ import reactor.core.publisher.Sinks;
 import org.springframework.context.Lifecycle;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
 import org.springframework.http.HttpHeaders;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.WebSocketHandler;
 import org.springframework.web.reactive.socket.adapter.ContextWebSocketHandler;
+import org.springframework.web.reactive.socket.adapter.Jetty10WebSocketHandlerAdapter;
 import org.springframework.web.reactive.socket.adapter.JettyWebSocketHandlerAdapter;
 import org.springframework.web.reactive.socket.adapter.JettyWebSocketSession;
 
@@ -53,6 +58,16 @@ import org.springframework.web.reactive.socket.adapter.JettyWebSocketSession;
  */
 public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 
+	private static ClassLoader loader = JettyWebSocketClient.class.getClassLoader();
+
+	private static final boolean jetty10Present;
+
+	static {
+		jetty10Present = ClassUtils.isPresent(
+				"org.eclipse.jetty.websocket.client.JettyUpgradeListener", loader);
+	}
+
+
 	private static final Log logger = LogFactory.getLog(JettyWebSocketClient.class);
 
 
@@ -60,6 +75,9 @@ public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 
 	private final boolean externallyManaged;
 
+	private final UpgradeHelper upgradeHelper =
+			(jetty10Present ? new Jetty10UpgradeHelper() : new Jetty9UpgradeHelper());
+
 
 	/**
 	 * Default constructor that creates and manages an instance of a Jetty
@@ -147,22 +165,19 @@ public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 					url, ContextWebSocketHandler.decorate(handler, contextView), completionSink);
 			ClientUpgradeRequest request = new ClientUpgradeRequest();
 			request.setSubProtocols(handler.getSubProtocols());
-			UpgradeListener upgradeListener = new DefaultUpgradeListener(headers);
-			try {
-				this.jettyClient.connect(jettyHandler, url, request, upgradeListener);
-				return completionSink.asMono();
-			}
-			catch (IOException ex) {
-				return Mono.error(ex);
-			}
+			return this.upgradeHelper.upgrade(
+					this.jettyClient, jettyHandler, url, request, headers, completionSink);
 		});
 	}
 
 	private Object createHandler(URI url, WebSocketHandler handler, Sinks.Empty<Void> completion) {
-		return new JettyWebSocketHandlerAdapter(handler, session -> {
+		Function<Session, JettyWebSocketSession> sessionFactory = session -> {
 			HandshakeInfo info = createHandshakeInfo(url, session);
 			return new JettyWebSocketSession(session, info, DefaultDataBufferFactory.sharedInstance, completion);
-		});
+		};
+		return (jetty10Present ?
+				new Jetty10WebSocketHandlerAdapter(handler, sessionFactory) :
+				new JettyWebSocketHandlerAdapter(handler, sessionFactory));
 	}
 
 	private HandshakeInfo createHandshakeInfo(URI url, Session jettySession) {
@@ -173,6 +188,34 @@ public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 	}
 
 
+	/**
+	 * Encapsulate incompatible changes between Jetty 9.4 and 10.
+	 */
+	private interface UpgradeHelper {
+
+		Mono<Void> upgrade(org.eclipse.jetty.websocket.client.WebSocketClient jettyClient,
+				Object jettyHandler, URI url, ClientUpgradeRequest request, HttpHeaders headers,
+				Sinks.Empty<Void> completionSink);
+	}
+
+
+	private static class Jetty9UpgradeHelper implements UpgradeHelper {
+
+		@Override
+		public Mono<Void> upgrade(org.eclipse.jetty.websocket.client.WebSocketClient jettyClient,
+				Object jettyHandler, URI url, ClientUpgradeRequest request, HttpHeaders headers,
+				Sinks.Empty<Void> completionSink) {
+
+			try {
+				jettyClient.connect(jettyHandler, url, request, new DefaultUpgradeListener(headers));
+				return completionSink.asMono();
+			}
+			catch (IOException ex) {
+				return Mono.error(ex);
+			}
+		}
+	}
+
 	private static class DefaultUpgradeListener implements UpgradeListener {
 
 		private final HttpHeaders headers;
@@ -192,4 +235,32 @@ public class JettyWebSocketClient implements WebSocketClient, Lifecycle {
 		}
 	}
 
+	private static class Jetty10UpgradeHelper implements UpgradeHelper {
+
+		// On Jetty 9 returns Future, on Jetty 10 returns CompletableFuture
+		private static final Method connectMethod;
+
+		static {
+			try {
+				Class<?> type = loader.loadClass("org.eclipse.jetty.websocket.client.WebSocketClient");
+				connectMethod = type.getMethod("connect", Object.class, URI.class, ClientUpgradeRequest.class);
+			}
+			catch (ClassNotFoundException | NoSuchMethodException ex) {
+				throw new IllegalStateException("No compatible Jetty version found", ex);
+			}
+		}
+
+		@Override
+		public Mono<Void> upgrade(org.eclipse.jetty.websocket.client.WebSocketClient jettyClient,
+				Object jettyHandler, URI url, ClientUpgradeRequest request, HttpHeaders headers,
+				Sinks.Empty<Void> completionSink) {
+
+			// TODO: pass JettyUpgradeListener argument to set headers from HttpHeaders (like we do for Jetty 9)
+			//  which would require a JDK Proxy since it is new in Jetty 10
+
+			ReflectionUtils.invokeMethod(connectMethod, jettyClient, jettyHandler, url, request);
+			return completionSink.asMono();
+		}
+	}
+
 }

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -68,16 +68,19 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 
 	private static final boolean jettyPresent;
 
+	private static final boolean jetty10Present;
+
 	private static final boolean undertowPresent;
 
 	private static final boolean reactorNettyPresent;
 
 	static {
-		ClassLoader classLoader = HandshakeWebSocketService.class.getClassLoader();
-		tomcatPresent = ClassUtils.isPresent("org.apache.tomcat.websocket.server.WsHttpUpgradeHandler", classLoader);
-		jettyPresent = ClassUtils.isPresent("org.eclipse.jetty.websocket.server.WebSocketServerFactory", classLoader);
-		undertowPresent = ClassUtils.isPresent("io.undertow.websockets.WebSocketProtocolHandshakeHandler", classLoader);
-		reactorNettyPresent = ClassUtils.isPresent("reactor.netty.http.server.HttpServerResponse", classLoader);
+		ClassLoader loader = HandshakeWebSocketService.class.getClassLoader();
+		tomcatPresent = ClassUtils.isPresent("org.apache.tomcat.websocket.server.WsHttpUpgradeHandler", loader);
+		jettyPresent = ClassUtils.isPresent("org.eclipse.jetty.websocket.server.WebSocketServerFactory", loader);
+		jetty10Present = ClassUtils.isPresent("org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer", loader);
+		undertowPresent = ClassUtils.isPresent("io.undertow.websockets.WebSocketProtocolHandshakeHandler", loader);
+		reactorNettyPresent = ClassUtils.isPresent("reactor.netty.http.server.HttpServerResponse", loader);
 	}
 
 
@@ -117,6 +120,9 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 		else if (jettyPresent) {
 			className = "JettyRequestUpgradeStrategy";
 		}
+		else if (jetty10Present) {
+			className = "Jetty10RequestUpgradeStrategy";
+		}
 		else if (undertowPresent) {
 			className = "UndertowRequestUpgradeStrategy";
 		}

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/upgrade/Jetty10RequestUpgradeStrategy.java

@@ -0,0 +1,154 @@
+/*
+ * Copyright 2002-2021 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.reactive.socket.server.upgrade;
+
+import java.lang.reflect.Method;
+import java.util.function.Supplier;
+
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import reactor.core.publisher.Mono;
+
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.aop.target.EmptyTargetSource;
+import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
+import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
+import org.springframework.util.ReflectionUtils;
+import org.springframework.web.reactive.socket.HandshakeInfo;
+import org.springframework.web.reactive.socket.WebSocketHandler;
+import org.springframework.web.reactive.socket.adapter.ContextWebSocketHandler;
+import org.springframework.web.reactive.socket.adapter.Jetty10WebSocketHandlerAdapter;
+import org.springframework.web.reactive.socket.adapter.JettyWebSocketSession;
+import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy;
+import org.springframework.web.server.ServerWebExchange;
+
+/**
+ * A {@link RequestUpgradeStrategy} for use with Jetty 10.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.3.4
+ */
+public class Jetty10RequestUpgradeStrategy implements RequestUpgradeStrategy {
+
+	private static final Class<?> webSocketCreatorClass;
+
+	private static final Method getContainerMethod;
+
+	private static final Method upgradeMethod;
+
+	private static final Method setAcceptedSubProtocol;
+
+	static {
+		ClassLoader loader = Jetty10RequestUpgradeStrategy.class.getClassLoader();
+		try {
+			webSocketCreatorClass = loader.loadClass("org.eclipse.jetty.websocket.server.JettyWebSocketCreator");
+
+			Class<?> type = loader.loadClass("org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer");
+			getContainerMethod = type.getMethod("getContainer", ServletContext.class);
+			upgradeMethod = ReflectionUtils.findMethod(type, "upgrade", (Class<?>[]) null);
+
+			type = loader.loadClass("org.eclipse.jetty.websocket.server.JettyServerUpgradeResponse");
+			setAcceptedSubProtocol = type.getMethod("setAcceptedSubProtocol", String.class);
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException("No compatible Jetty version found", ex);
+		}
+	}
+
+
+	@Override
+	public Mono<Void> upgrade(
+			ServerWebExchange exchange, WebSocketHandler handler,
+			@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) {
+
+		ServerHttpRequest request = exchange.getRequest();
+		ServerHttpResponse response = exchange.getResponse();
+
+		HttpServletRequest servletRequest = ServerHttpRequestDecorator.getNativeRequest(request);
+		HttpServletResponse servletResponse = ServerHttpResponseDecorator.getNativeResponse(response);
+		ServletContext servletContext = servletRequest.getServletContext();
+
+		HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
+		DataBufferFactory factory = response.bufferFactory();
+
+		// Trigger WebFlux preCommit actions and upgrade
+		return exchange.getResponse().setComplete()
+				.then(Mono.deferContextual(contextView -> {
+					Jetty10WebSocketHandlerAdapter adapter = new Jetty10WebSocketHandlerAdapter(
+							ContextWebSocketHandler.decorate(handler, contextView),
+							session -> new JettyWebSocketSession(session, handshakeInfo, factory));
+
+					try {
+						Object creator = createJettyWebSocketCreator(adapter, subProtocol);
+						Object container = ReflectionUtils.invokeMethod(getContainerMethod, null, servletContext);
+						ReflectionUtils.invokeMethod(upgradeMethod, container, creator, servletRequest, servletResponse);
+					}
+					catch (Exception ex) {
+						return Mono.error(ex);
+					}
+					return Mono.empty();
+				}));
+	}
+
+	private static Object createJettyWebSocketCreator(
+			Jetty10WebSocketHandlerAdapter adapter, @Nullable String protocol) {
+
+		ProxyFactory factory = new ProxyFactory(EmptyTargetSource.INSTANCE);
+		factory.addInterface(webSocketCreatorClass);
+		factory.addAdvice(new WebSocketCreatorInterceptor(adapter, protocol));
+		return factory.getProxy();
+	}
+
+
+	/**
+	 * Proxy for a JettyWebSocketCreator to supply the WebSocket handler and set the sub-protocol.
+	 */
+	private static class WebSocketCreatorInterceptor implements MethodInterceptor {
+
+		private final Jetty10WebSocketHandlerAdapter adapter;
+
+		@Nullable
+		private final String protocol;
+
+
+		public WebSocketCreatorInterceptor(
+				Jetty10WebSocketHandlerAdapter adapter, @Nullable String protocol) {
+
+			this.adapter = adapter;
+			this.protocol = protocol;
+		}
+
+		@Nullable
+		@Override
+		public Object invoke(@NonNull MethodInvocation invocation) {
+			if (this.protocol != null) {
+				ReflectionUtils.invokeMethod(
+						setAcceptedSubProtocol, invocation.getArguments()[2], this.protocol);
+			}
+			return this.adapter;
+		}
+	}
+
+}

spring-websocket/src/main/java/org/springframework/web/socket/adapter/jetty/Jetty10WebSocketHandlerAdapter.java

@@ -0,0 +1,137 @@
+/*
+ * Copyright 2002-2021 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.socket.adapter.jetty;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.eclipse.jetty.websocket.api.Session;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketError;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
+import org.eclipse.jetty.websocket.api.annotations.WebSocket;
+import org.eclipse.jetty.websocket.api.extensions.Frame;
+
+import org.springframework.util.Assert;
+import org.springframework.web.socket.BinaryMessage;
+import org.springframework.web.socket.CloseStatus;
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketHandler;
+import org.springframework.web.socket.handler.ExceptionWebSocketHandlerDecorator;
+
+/**
+ * Identical to {@link JettyWebSocketHandlerAdapter}, only excluding the
+ * {@code onWebSocketFrame} method, since the {@link Frame} argument has moved
+ * to a different package in Jetty 10.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.3.4
+ */
+@WebSocket
+public class Jetty10WebSocketHandlerAdapter {
+
+	private static final Log logger = LogFactory.getLog(Jetty10WebSocketHandlerAdapter.class);
+
+
+	private final WebSocketHandler webSocketHandler;
+
+	private final JettyWebSocketSession wsSession;
+
+
+	public Jetty10WebSocketHandlerAdapter(WebSocketHandler webSocketHandler, JettyWebSocketSession wsSession) {
+		Assert.notNull(webSocketHandler, "WebSocketHandler must not be null");
+		Assert.notNull(wsSession, "WebSocketSession must not be null");
+		this.webSocketHandler = webSocketHandler;
+		this.wsSession = wsSession;
+	}
+
+
+	@OnWebSocketConnect
+	public void onWebSocketConnect(Session session) {
+		try {
+			this.wsSession.initializeNativeSession(session);
+			this.webSocketHandler.afterConnectionEstablished(this.wsSession);
+		}
+		catch (Exception ex) {
+			ExceptionWebSocketHandlerDecorator.tryCloseWithError(this.wsSession, ex, logger);
+		}
+	}
+
+	@OnWebSocketMessage
+	public void onWebSocketText(String payload) {
+		TextMessage message = new TextMessage(payload);
+		try {
+			this.webSocketHandler.handleMessage(this.wsSession, message);
+		}
+		catch (Exception ex) {
+			ExceptionWebSocketHandlerDecorator.tryCloseWithError(this.wsSession, ex, logger);
+		}
+	}
+
+	@OnWebSocketMessage
+	public void onWebSocketBinary(byte[] payload, int offset, int length) {
+		BinaryMessage message = new BinaryMessage(payload, offset, length, true);
+		try {
+			this.webSocketHandler.handleMessage(this.wsSession, message);
+		}
+		catch (Exception ex) {
+			ExceptionWebSocketHandlerDecorator.tryCloseWithError(this.wsSession, ex, logger);
+		}
+	}
+
+// TODO: onWebSocketFrame can't be declared without compiling against Jetty 10
+//   Jetty 10: org.eclipse.jetty.websocket.api.Frame
+//   Jetty  9: org.eclipse.jetty.websocket.api.extensions.Frame
+
+//	@OnWebSocketFrame
+//	public void onWebSocketFrame(Frame frame) {
+//		if (OpCode.PONG == frame.getOpCode()) {
+//			ByteBuffer payload = frame.getPayload() != null ? frame.getPayload() : EMPTY_PAYLOAD;
+//			PongMessage message = new PongMessage(payload);
+//			try {
+//				this.webSocketHandler.handleMessage(this.wsSession, message);
+//			}
+//			catch (Exception ex) {
+//				ExceptionWebSocketHandlerDecorator.tryCloseWithError(this.wsSession, ex, logger);
+//			}
+//		}
+//	}
+
+	@OnWebSocketClose
+	public void onWebSocketClose(int statusCode, String reason) {
+		CloseStatus closeStatus = new CloseStatus(statusCode, reason);
+		try {
+			this.webSocketHandler.afterConnectionClosed(this.wsSession, closeStatus);
+		}
+		catch (Exception ex) {
+			if (logger.isWarnEnabled()) {
+				logger.warn("Unhandled exception after connection closed for " + this, ex);
+			}
+		}
+	}
+
+	@OnWebSocketError
+	public void onWebSocketError(Throwable cause) {
+		try {
+			this.webSocketHandler.handleTransportError(this.wsSession, cause);
+		}
+		catch (Exception ex) {
+			ExceptionWebSocketHandlerDecorator.tryCloseWithError(this.wsSession, ex, logger);
+		}
+	}
+
+}

spring-websocket/src/main/java/org/springframework/web/socket/adapter/jetty/JettyWebSocketSession.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -17,6 +17,7 @@
 package org.springframework.web.socket.adapter.jetty;
 
 import java.io.IOException;
+import java.lang.reflect.Method;
 import java.net.InetSocketAddress;
 import java.net.URI;
 import java.security.Principal;
@@ -27,13 +28,14 @@ import java.util.Map;
 
 import org.eclipse.jetty.websocket.api.RemoteEndpoint;
 import org.eclipse.jetty.websocket.api.Session;
-import org.eclipse.jetty.websocket.api.WebSocketException;
 import org.eclipse.jetty.websocket.api.extensions.ExtensionConfig;
 
 import org.springframework.http.HttpHeaders;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.CollectionUtils;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.web.socket.BinaryMessage;
 import org.springframework.web.socket.CloseStatus;
 import org.springframework.web.socket.PingMessage;
@@ -54,6 +56,12 @@ import org.springframework.web.socket.adapter.AbstractWebSocketSession;
  */
 public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 
+	private static final ClassLoader loader = JettyWebSocketSession.class.getClassLoader();
+
+	private static final boolean jetty10Present = ClassUtils.isPresent(
+			"org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer", loader);
+
+
 	private final String id;
 
 	@Nullable
@@ -71,6 +79,8 @@ public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 	@Nullable
 	private Principal user;
 
+	private final SessionHelper sessionHelper;
+
 
 	/**
 	 * Create a new {@link JettyWebSocketSession} instance.
@@ -91,6 +101,7 @@ public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 		super(attributes);
 		this.id = idGenerator.generateId().toString();
 		this.user = user;
+		this.sessionHelper = (jetty10Present ? new Jetty10SessionHelper() : new Jetty9SessionHelper());
 	}
 
 
@@ -141,28 +152,32 @@ public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 		return getNativeSession().getRemoteAddress();
 	}
 
+	/**
+	 * This method is a no-op for Jetty. As per {@link Session#getPolicy()}, the
+	 * returned {@code WebSocketPolicy} is read-only and changing it has no effect.
+	 */
 	@Override
 	public void setTextMessageSizeLimit(int messageSizeLimit) {
-		checkNativeSessionInitialized();
-		getNativeSession().getPolicy().setMaxTextMessageSize(messageSizeLimit);
 	}
 
 	@Override
 	public int getTextMessageSizeLimit() {
 		checkNativeSessionInitialized();
-		return getNativeSession().getPolicy().getMaxTextMessageSize();
+		return this.sessionHelper.getTextMessageSizeLimit(getNativeSession());
 	}
 
+	/**
+	 * This method is a no-op for Jetty. As per {@link Session#getPolicy()}, the
+	 * returned {@code WebSocketPolicy} is read-only and changing it has no effect.
+	 */
 	@Override
 	public void setBinaryMessageSizeLimit(int messageSizeLimit) {
-		checkNativeSessionInitialized();
-		getNativeSession().getPolicy().setMaxBinaryMessageSize(messageSizeLimit);
 	}
 
 	@Override
 	public int getBinaryMessageSizeLimit() {
 		checkNativeSessionInitialized();
-		return getNativeSession().getPolicy().getMaxBinaryMessageSize();
+		return this.sessionHelper.getBinaryMessageSizeLimit(getNativeSession());
 	}
 
 	@Override
@@ -178,22 +193,14 @@ public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 		this.uri = session.getUpgradeRequest().getRequestURI();
 
 		HttpHeaders headers = new HttpHeaders();
-		headers.putAll(session.getUpgradeRequest().getHeaders());
+		Map<String, List<String>> nativeHeaders = session.getUpgradeRequest().getHeaders();
+		if (!CollectionUtils.isEmpty(nativeHeaders)) {
+			headers.putAll(nativeHeaders);
+		}
 		this.headers = HttpHeaders.readOnlyHttpHeaders(headers);
 
 		this.acceptedProtocol = session.getUpgradeResponse().getAcceptedSubProtocol();
-
-		List<ExtensionConfig> jettyExtensions = session.getUpgradeResponse().getExtensions();
-		if (!CollectionUtils.isEmpty(jettyExtensions)) {
-			List<WebSocketExtension> extensions = new ArrayList<>(jettyExtensions.size());
-			for (ExtensionConfig jettyExtension : jettyExtensions) {
-				extensions.add(new WebSocketExtension(jettyExtension.getName(), jettyExtension.getParameters()));
-			}
-			this.extensions = Collections.unmodifiableList(extensions);
-		}
-		else {
-			this.extensions = Collections.emptyList();
-		}
+		this.extensions = this.sessionHelper.getExtensions(session);
 
 		if (this.user == null) {
 			this.user = session.getUpgradeRequest().getUserPrincipal();
@@ -221,13 +228,8 @@ public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 		getRemoteEndpoint().sendPong(message.getPayload());
 	}
 
-	private RemoteEndpoint getRemoteEndpoint() throws IOException {
-		try {
-			return getNativeSession().getRemote();
-		}
-		catch (WebSocketException ex) {
-			throw new IOException("Unable to obtain RemoteEndpoint in session " + getId(), ex);
-		}
+	private RemoteEndpoint getRemoteEndpoint() {
+		return getNativeSession().getRemote();
 	}
 
 	@Override
@@ -235,4 +237,90 @@ public class JettyWebSocketSession extends AbstractWebSocketSession<Session> {
 		getNativeSession().close(status.getCode(), status.getReason());
 	}
 
+
+	/**
+	 * Encapsulate incompatible changes between Jetty 9.4 and 10.
+	 */
+	private interface SessionHelper {
+
+		List<WebSocketExtension> getExtensions(Session session);
+
+		int getTextMessageSizeLimit(Session session);
+
+		int getBinaryMessageSizeLimit(Session session);
+	}
+
+
+	private static class Jetty9SessionHelper implements SessionHelper {
+
+		@Override
+		public List<WebSocketExtension> getExtensions(Session session) {
+			List<ExtensionConfig> configs = session.getUpgradeResponse().getExtensions();
+			if (!CollectionUtils.isEmpty(configs)) {
+				List<WebSocketExtension> result = new ArrayList<>(configs.size());
+				for (ExtensionConfig config : configs) {
+					result.add(new WebSocketExtension(config.getName(), config.getParameters()));
+				}
+				return Collections.unmodifiableList(result);
+			}
+			return Collections.emptyList();
+		}
+
+		@Override
+		public int getTextMessageSizeLimit(Session session) {
+			return session.getPolicy().getMaxTextMessageSize();
+		}
+
+		@Override
+		public int getBinaryMessageSizeLimit(Session session) {
+			return session.getPolicy().getMaxBinaryMessageSize();
+		}
+	}
+
+
+	private static class Jetty10SessionHelper implements SessionHelper {
+
+		private static final Method getTextMessageSizeLimitMethod;
+
+		private static final Method getBinaryMessageSizeLimitMethod;
+
+		static {
+			try {
+				Class<?> type = loader.loadClass("org.eclipse.jetty.websocket.api.WebSocketPolicy");
+				getTextMessageSizeLimitMethod = type.getMethod("getMaxTextMessageSize");
+				getBinaryMessageSizeLimitMethod = type.getMethod("getMaxBinaryMessageSize");
+			}
+			catch (ClassNotFoundException | NoSuchMethodException ex) {
+				throw new IllegalStateException("No compatible Jetty version found", ex);
+			}
+		}
+
+		// TODO: Extension info can't be accessed without compiling against Jetty 10
+		//   Jetty 10: org.eclipse.jetty.websocket.api.ExtensionConfig
+		//   Jetty  9: org.eclipse.jetty.websocket.api.extensions.ExtensionConfig
+
+		@Override
+		public List<WebSocketExtension> getExtensions(Session session) {
+			return Collections.emptyList();
+		}
+
+		// TODO: WebSocketPolicy can't be accessed without compiling against Jetty 10 (class -> interface)
+
+		@Override
+		@SuppressWarnings("ConstantConditions")
+		public int getTextMessageSizeLimit(Session session) {
+			long result = (long) ReflectionUtils.invokeMethod(getTextMessageSizeLimitMethod, session.getPolicy());
+			Assert.state(result <= Integer.MAX_VALUE, "textMessageSizeLimit is larger than Integer.MAX_VALUE");
+			return (int) result;
+		}
+
+		@Override
+		@SuppressWarnings("ConstantConditions")
+		public int getBinaryMessageSizeLimit(Session session) {
+			long result = (long) ReflectionUtils.invokeMethod(getBinaryMessageSizeLimitMethod, session.getPolicy());
+			Assert.state(result <= Integer.MAX_VALUE, "binaryMessageSizeLimit is larger than Integer.MAX_VALUE");
+			return (int) result;
+		}
+	}
+
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -16,6 +16,8 @@
 
 package org.springframework.web.socket.client.jetty;
 
+import java.io.IOException;
+import java.lang.reflect.Method;
 import java.net.URI;
 import java.security.Principal;
 import java.util.List;
@@ -34,11 +36,14 @@ import org.springframework.core.task.SimpleAsyncTaskExecutor;
 import org.springframework.core.task.TaskExecutor;
 import org.springframework.http.HttpHeaders;
 import org.springframework.lang.Nullable;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.util.concurrent.ListenableFuture;
 import org.springframework.util.concurrent.ListenableFutureTask;
 import org.springframework.web.socket.WebSocketExtension;
 import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.adapter.jetty.Jetty10WebSocketHandlerAdapter;
 import org.springframework.web.socket.adapter.jetty.JettyWebSocketHandlerAdapter;
 import org.springframework.web.socket.adapter.jetty.JettyWebSocketSession;
 import org.springframework.web.socket.adapter.jetty.WebSocketToJettyExtensionConfigAdapter;
@@ -60,11 +65,32 @@ import org.springframework.web.util.UriComponentsBuilder;
  */
 public class JettyWebSocketClient extends AbstractWebSocketClient implements Lifecycle {
 
+	private static ClassLoader loader = JettyWebSocketClient.class.getClassLoader();
+
+	private static final boolean jetty10Present;
+
+	private static final Method setHeadersMethod;
+
+	static {
+		jetty10Present = ClassUtils.isPresent(
+				"org.eclipse.jetty.websocket.client.JettyUpgradeListener", loader);
+		try {
+			setHeadersMethod = ClientUpgradeRequest.class.getMethod("setHeaders", Map.class);
+		}
+		catch (NoSuchMethodException ex) {
+			throw new IllegalStateException("No compatible Jetty version found", ex);
+		}
+	}
+
+
 	private final org.eclipse.jetty.websocket.client.WebSocketClient client;
 
 	@Nullable
 	private AsyncListenableTaskExecutor taskExecutor = new SimpleAsyncTaskExecutor();
 
+	private final UpgradeHelper upgradeHelper =
+			(jetty10Present ? new Jetty10UpgradeHelper() : new Jetty9UpgradeHelper());
+
 
 	/**
 	 * Default constructor that creates an instance of
@@ -148,14 +174,15 @@ public class JettyWebSocketClient extends AbstractWebSocketClient implements Lif
 			request.addExtensions(new WebSocketToJettyExtensionConfigAdapter(e));
 		}
 
-		headers.forEach(request::setHeader);
+		// Jetty  9: setHeaders declared in UpgradeRequestAdapter base class
+		// Jetty 10: setHeaders declared in ClientUpgradeRequest
+		ReflectionUtils.invokeMethod(setHeadersMethod, request, headers);
 
 		Principal user = getUser();
-		final JettyWebSocketSession wsSession = new JettyWebSocketSession(attributes, user);
-		final JettyWebSocketHandlerAdapter listener = new JettyWebSocketHandlerAdapter(wsHandler, wsSession);
+		JettyWebSocketSession wsSession = new JettyWebSocketSession(attributes, user);
 
 		Callable<WebSocketSession> connectTask = () -> {
-			Future<Session> future = this.client.connect(listener, uri, request);
+			Future<Session> future = this.upgradeHelper.connect(this.client, uri, request, wsHandler, wsSession);
 			future.get(this.client.getConnectTimeout() + 2000, TimeUnit.MILLISECONDS);
 			return wsSession;
 		};
@@ -179,4 +206,55 @@ public class JettyWebSocketClient extends AbstractWebSocketClient implements Lif
 		return null;
 	}
 
+
+	/**
+	 * Encapsulate incompatible changes between Jetty 9.4 and 10.
+	 */
+	private interface UpgradeHelper {
+
+		Future<Session> connect(WebSocketClient client, URI url, ClientUpgradeRequest request,
+				WebSocketHandler handler, JettyWebSocketSession session) throws IOException;
+	}
+
+
+	private static class Jetty9UpgradeHelper implements UpgradeHelper {
+
+		@Override
+		public Future<Session> connect(WebSocketClient client, URI url, ClientUpgradeRequest request,
+				WebSocketHandler handler, JettyWebSocketSession session) throws IOException {
+
+			JettyWebSocketHandlerAdapter adapter = new JettyWebSocketHandlerAdapter(handler, session);
+			return client.connect(adapter, url, request);
+		}
+	}
+
+
+	private static class Jetty10UpgradeHelper implements UpgradeHelper {
+
+		// On Jetty 9 returns Future, on Jetty 10 returns CompletableFuture
+		private static final Method connectMethod;
+
+		static {
+			try {
+				Class<?> type = loader.loadClass("org.eclipse.jetty.websocket.client.WebSocketClient");
+				connectMethod = type.getMethod("connect", Object.class, URI.class, ClientUpgradeRequest.class);
+			}
+			catch (ClassNotFoundException | NoSuchMethodException ex) {
+				throw new IllegalStateException("No compatible Jetty version found", ex);
+			}
+		}
+
+		@Override
+		@SuppressWarnings({"ConstantConditions", "unchecked"})
+		public Future<Session> connect(WebSocketClient client, URI url, ClientUpgradeRequest request,
+				WebSocketHandler handler, JettyWebSocketSession session) {
+
+			Jetty10WebSocketHandlerAdapter adapter = new Jetty10WebSocketHandlerAdapter(handler, session);
+
+			// TODO: pass JettyUpgradeListener argument to set headers from HttpHeaders (like we do for Jetty 9)
+			//  which would require a JDK Proxy since it is new in Jetty 10
+			return (Future<Session>) ReflectionUtils.invokeMethod(connectMethod, client, adapter, url, request);
+		}
+	}
+
 }

spring-websocket/src/main/java/org/springframework/web/socket/server/jetty/Jetty10RequestUpgradeStrategy.java

@@ -0,0 +1,165 @@
+/*
+ * Copyright 2002-2021 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.socket.server.jetty;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.UndeclaredThrowableException;
+import java.security.Principal;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.eclipse.jetty.websocket.server.HandshakeRFC6455;
+
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.aop.target.EmptyTargetSource;
+import org.springframework.http.server.ServerHttpRequest;
+import org.springframework.http.server.ServerHttpResponse;
+import org.springframework.http.server.ServletServerHttpRequest;
+import org.springframework.http.server.ServletServerHttpResponse;
+import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
+import org.springframework.util.ReflectionUtils;
+import org.springframework.web.socket.WebSocketExtension;
+import org.springframework.web.socket.WebSocketHandler;
+import org.springframework.web.socket.adapter.jetty.Jetty10WebSocketHandlerAdapter;
+import org.springframework.web.socket.adapter.jetty.JettyWebSocketSession;
+import org.springframework.web.socket.server.HandshakeFailureException;
+import org.springframework.web.socket.server.RequestUpgradeStrategy;
+
+/**
+ * A {@link RequestUpgradeStrategy} for Jetty 10.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.3.4
+ */
+public class Jetty10RequestUpgradeStrategy implements RequestUpgradeStrategy {
+
+	private static final String[] SUPPORTED_VERSIONS = new String[] { String.valueOf(HandshakeRFC6455.VERSION) };
+
+	private static final Class<?> webSocketCreatorClass;
+
+	private static final Method getContainerMethod;
+
+	private static final Method upgradeMethod;
+
+	private static final Method setAcceptedSubProtocol;
+
+	static {
+		ClassLoader loader = Jetty10RequestUpgradeStrategy.class.getClassLoader();
+		try {
+			webSocketCreatorClass = loader.loadClass("org.eclipse.jetty.websocket.server.JettyWebSocketCreator");
+
+			Class<?> type = loader.loadClass("org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer");
+			getContainerMethod = type.getMethod("getContainer", ServletContext.class);
+			upgradeMethod = ReflectionUtils.findMethod(type, "upgrade", (Class<?>[]) null);
+
+			type = loader.loadClass("org.eclipse.jetty.websocket.server.JettyServerUpgradeResponse");
+			setAcceptedSubProtocol = type.getMethod("setAcceptedSubProtocol", String.class);
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException("No compatible Jetty version found", ex);
+		}
+	}
+
+
+	@Override
+	public String[] getSupportedVersions() {
+		return SUPPORTED_VERSIONS;
+	}
+
+	@Override
+	public List<WebSocketExtension> getSupportedExtensions(ServerHttpRequest request) {
+		return Collections.emptyList();
+	}
+
+
+	@Override
+	public void upgrade(ServerHttpRequest request, ServerHttpResponse response,
+			@Nullable String selectedProtocol, List<WebSocketExtension> selectedExtensions,
+			@Nullable Principal user, WebSocketHandler handler, Map<String, Object> attributes)
+			throws HandshakeFailureException {
+
+		Assert.isInstanceOf(ServletServerHttpRequest.class, request, "ServletServerHttpRequest required");
+		HttpServletRequest servletRequest = ((ServletServerHttpRequest) request).getServletRequest();
+		ServletContext servletContext = servletRequest.getServletContext();
+
+		Assert.isInstanceOf(ServletServerHttpResponse.class, response, "ServletServerHttpResponse required");
+		HttpServletResponse servletResponse = ((ServletServerHttpResponse) response).getServletResponse();
+
+		JettyWebSocketSession session = new JettyWebSocketSession(attributes, user);
+		Jetty10WebSocketHandlerAdapter handlerAdapter = new Jetty10WebSocketHandlerAdapter(handler, session);
+
+		try {
+			Object creator = createJettyWebSocketCreator(handlerAdapter, selectedProtocol);
+			Object container = ReflectionUtils.invokeMethod(getContainerMethod, null, servletContext);
+			ReflectionUtils.invokeMethod(upgradeMethod, container, creator, servletRequest, servletResponse);
+		}
+		catch (UndeclaredThrowableException ex) {
+			throw new HandshakeFailureException("Failed to upgrade", ex.getUndeclaredThrowable());
+		}
+		catch (Exception ex) {
+			throw new HandshakeFailureException("Failed to upgrade", ex);
+		}
+	}
+
+	private static Object createJettyWebSocketCreator(
+			Jetty10WebSocketHandlerAdapter adapter, @Nullable String protocol) {
+
+		ProxyFactory factory = new ProxyFactory(EmptyTargetSource.INSTANCE);
+		factory.addInterface(webSocketCreatorClass);
+		factory.addAdvice(new WebSocketCreatorInterceptor(adapter, protocol));
+		return factory.getProxy();
+	}
+
+
+	/**
+	 * Proxy for a JettyWebSocketCreator to supply the WebSocket handler and set the sub-protocol.
+	 */
+	private static class WebSocketCreatorInterceptor implements MethodInterceptor {
+
+		private final Jetty10WebSocketHandlerAdapter adapter;
+
+		@Nullable
+		private final String protocol;
+
+
+		public WebSocketCreatorInterceptor(
+				Jetty10WebSocketHandlerAdapter adapter, @Nullable String protocol) {
+
+			this.adapter = adapter;
+			this.protocol = protocol;
+		}
+
+		@Nullable
+		@Override
+		public Object invoke(@NonNull MethodInvocation invocation) {
+			if (this.protocol != null) {
+				ReflectionUtils.invokeMethod(
+						setAcceptedSubProtocol, invocation.getArguments()[2], this.protocol);
+			}
+			return this.adapter;
+		}
+	}
+
+}

spring-websocket/src/main/java/org/springframework/web/socket/server/support/AbstractHandshakeHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -71,9 +71,11 @@ import org.springframework.web.socket.server.RequestUpgradeStrategy;
  */
 public abstract class AbstractHandshakeHandler implements HandshakeHandler, Lifecycle {
 
+	private static final boolean tomcatWsPresent;
+
 	private static final boolean jettyWsPresent;
 
-	private static final boolean tomcatWsPresent;
+	private static final boolean jetty10WsPresent;
 
 	private static final boolean undertowWsPresent;
 
@@ -85,10 +87,12 @@ public abstract class AbstractHandshakeHandler implements HandshakeHandler, Life
 
 	static {
 		ClassLoader classLoader = AbstractHandshakeHandler.class.getClassLoader();
-		jettyWsPresent = ClassUtils.isPresent(
-				"org.eclipse.jetty.websocket.server.WebSocketServerFactory", classLoader);
 		tomcatWsPresent = ClassUtils.isPresent(
 				"org.apache.tomcat.websocket.server.WsHttpUpgradeHandler", classLoader);
+		jetty10WsPresent = ClassUtils.isPresent(
+				"org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer", classLoader);
+		jettyWsPresent = ClassUtils.isPresent(
+				"org.eclipse.jetty.websocket.server.WebSocketServerFactory", classLoader);
 		undertowWsPresent = ClassUtils.isPresent(
 				"io.undertow.websockets.jsr.ServerWebSocketContainer", classLoader);
 		glassfishWsPresent = ClassUtils.isPresent(
@@ -97,7 +101,6 @@ public abstract class AbstractHandshakeHandler implements HandshakeHandler, Life
 				"weblogic.websocket.tyrus.TyrusServletWriter", classLoader);
 		websphereWsPresent = ClassUtils.isPresent(
 				"com.ibm.websphere.wsoc.WsWsocServerContainer", classLoader);
-
 	}
 
 
@@ -137,6 +140,9 @@ public abstract class AbstractHandshakeHandler implements HandshakeHandler, Life
 		else if (jettyWsPresent) {
 			className = "org.springframework.web.socket.server.jetty.JettyRequestUpgradeStrategy";
 		}
+		else if (jetty10WsPresent) {
+			className = "org.springframework.web.socket.server.jetty.Jetty10RequestUpgradeStrategy";
+		}
 		else if (undertowWsPresent) {
 			className = "org.springframework.web.socket.server.standard.UndertowRequestUpgradeStrategy";
 		}