Polishing

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/EventSourceTransportHandler.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -50,7 +50,7 @@ public class EventSourceTransportHandler extends AbstractHttpSendingTransportHan
 
 	@Override
 	public boolean checkSessionType(SockJsSession session) {
-		return session instanceof EventSourceStreamingSockJsSession;
+		return (session instanceof EventSourceStreamingSockJsSession);
 	}
 
 	@Override
@@ -66,7 +66,7 @@ public class EventSourceTransportHandler extends AbstractHttpSendingTransportHan
 	}
 
 
-	private class EventSourceStreamingSockJsSession extends StreamingSockJsSession {
+	private static class EventSourceStreamingSockJsSession extends StreamingSockJsSession {
 
 		public EventSourceStreamingSockJsSession(String sessionId, SockJsServiceConfig config,
 				WebSocketHandler wsHandler, Map<String, Object> attributes) {
@@ -76,7 +76,7 @@ public class EventSourceTransportHandler extends AbstractHttpSendingTransportHan
 
 		@Override
 		protected byte[] getPrelude(ServerHttpRequest request) {
-			return new byte[] { '\r', '\n' };
+			return new byte[] {'\r', '\n'};
 		}
 	}
 

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/HtmlFileTransportHandler.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -93,7 +93,7 @@ public class HtmlFileTransportHandler extends AbstractHttpSendingTransportHandle
 
 	@Override
 	public boolean checkSessionType(SockJsSession session) {
-		return session instanceof HtmlFileStreamingSockJsSession;
+		return (session instanceof HtmlFileStreamingSockJsSession);
 	}
 
 	@Override

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/WebSocketTransportHandler.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -107,7 +107,7 @@ public class WebSocketTransportHandler extends AbstractTransportHandler
 
 	@Override
 	public boolean checkSessionType(SockJsSession session) {
-		return session instanceof WebSocketServerSockJsSession;
+		return (session instanceof WebSocketServerSockJsSession);
 	}
 
 	@Override

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/XhrPollingTransportHandler.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -54,7 +54,7 @@ public class XhrPollingTransportHandler extends AbstractHttpSendingTransportHand
 
 	@Override
 	public boolean checkSessionType(SockJsSession session) {
-		return session instanceof PollingSockJsSession;
+		return (session instanceof PollingSockJsSession);
 	}
 
 	@Override

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/XhrStreamingTransportHandler.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -59,7 +59,7 @@ public class XhrStreamingTransportHandler extends AbstractHttpSendingTransportHa
 
 	@Override
 	public boolean checkSessionType(SockJsSession session) {
-		return session instanceof XhrStreamingSockJsSession;
+		return (session instanceof XhrStreamingSockJsSession);
 	}
 
 	@Override