diff --git a/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketMessage.java b/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketMessage.java
index f5f9433d580..73cb3a06579 100644
--- a/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketMessage.java
+++ b/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketMessage.java
@@ -16,9 +16,6 @@
 
 package org.springframework.web.socket;
 
-import org.springframework.util.Assert;
-import org.springframework.util.ObjectUtils;
-
 /**
  * A message that can be handled or sent on a WebSocket connection.
  *
@@ -35,9 +32,9 @@ public interface WebSocketMessage<T> {
 	/**
 	 * When partial message support is available and requested via
 	 * {@link org.springframework.web.socket.WebSocketHandler#supportsPartialMessages()},
-	 * this method returns {@literal true} if the current message is the last part of
-	 * the complete WebSocket message sent by the client. Otherwise {@literal false}
-	 * is returned if partial message support is either not available or not enabled.
+	 * this method returns {@code true} if the current message is the last part of the
+	 * complete WebSocket message sent by the client. Otherwise {@code false} is returned
+	 * if partial message support is either not available or not enabled.
 	 */
 	boolean isLast();
 
diff --git a/spring-websocket/src/main/java/org/springframework/web/socket/adapter/JettyWebSocketHandlerAdapter.java b/spring-websocket/src/main/java/org/springframework/web/socket/adapter/JettyWebSocketHandlerAdapter.java
index 2972c7b3bbf..1c792eda51e 100644
--- a/spring-websocket/src/main/java/org/springframework/web/socket/adapter/JettyWebSocketHandlerAdapter.java
+++ b/spring-websocket/src/main/java/org/springframework/web/socket/adapter/JettyWebSocketHandlerAdapter.java
@@ -35,8 +35,6 @@ import org.springframework.web.socket.TextMessage;
 import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.support.ExceptionWebSocketHandlerDecorator;
 
-import java.nio.ByteBuffer;
-
 /**
  * Adapts {@link WebSocketHandler} to the Jetty 9 WebSocket API.
  *