Polish: "@Override" should be used on overriding and implementing methods

spring-websocket/src/main/java/org/springframework/web/socket/handler/ConcurrentWebSocketSessionDecorator.java

@@ -112,7 +112,7 @@ public class ConcurrentWebSocketSessionDecorator extends WebSocketSessionDecorat
 		return (start > 0 ? (System.currentTimeMillis() - start) : 0);
 	}
 
-
+	@Override
 	public void sendMessage(WebSocketMessage<?> message) throws IOException {
 		if (shouldNotSend()) {
 			return;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/AbstractTyrusRequestUpgradeStrategy.java

@@ -114,6 +114,7 @@ public abstract class AbstractTyrusRequestUpgradeStrategy extends AbstractStanda
 		return StringUtils.tokenizeToStringArray(Version.getSupportedWireProtocolVersions(), ",");
 	}
 
+	@Override
 	protected List<WebSocketExtension> getInstalledExtensions(WebSocketContainer container) {
 		try {
 			return super.getInstalledExtensions(container);

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/TomcatRequestUpgradeStrategy.java

@@ -81,6 +81,7 @@ public class TomcatRequestUpgradeStrategy extends AbstractStandardUpgradeStrateg
 		}
 	}
 
+	@Override
 	public WsServerContainer getContainer(HttpServletRequest request) {
 		return (WsServerContainer) super.getContainer(request);
 	}

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/UndertowRequestUpgradeStrategy.java

@@ -86,6 +86,7 @@ public class UndertowRequestUpgradeStrategy extends AbstractStandardUpgradeStrat
 		}
 	}
 
+	@Override
 	public ServerWebSocketContainer getContainer(HttpServletRequest request) {
 		return (ServerWebSocketContainer) super.getContainer(request);
 	}