Polish WebSocket-related

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

@@ -23,6 +23,7 @@ import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.adapter.StandardWebSocketSession;
 import org.springframework.web.reactive.socket.adapter.TomcatWebSocketSession;
 
+import org.apache.tomcat.websocket.WsWebSocketContainer;
 import reactor.core.publisher.MonoProcessor;
 
 /**
@@ -35,6 +36,7 @@ public class TomcatWebSocketClient extends StandardWebSocketClient {
 
 
 	public TomcatWebSocketClient() {
+		this(new WsWebSocketContainer());
 	}
 
 	public TomcatWebSocketClient(WebSocketContainer webSocketContainer) {

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

@@ -46,6 +46,7 @@ public interface RequestUpgradeStrategy {
 	 * @return completion {@code Mono<Void>} to indicate the outcome of the
 	 * WebSocket session handling.
 	 */
-	Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler webSocketHandler, @Nullable String subProtocol);
+	Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler webSocketHandler,
+			@Nullable String subProtocol);
 
 }

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

@@ -92,7 +92,7 @@ public abstract class AbstractWebSocketIntegrationTests {
 	public static Object[][] arguments() throws IOException {
 
 		WebSocketClient[] clients = new WebSocketClient[] {
-				new TomcatWebSocketClient(new WsWebSocketContainer()),
+				new TomcatWebSocketClient(),
 				new JettyWebSocketClient(),
 				new ReactorNettyWebSocketClient(),
 				new UndertowWebSocketClient(Xnio.getInstance().createWorker(OptionMap.EMPTY))