diff --git a/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/frame/SockJsFrame.java b/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/frame/SockJsFrame.java
index fbd5ca13bb..97a620170d 100644
--- a/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/frame/SockJsFrame.java
+++ b/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/frame/SockJsFrame.java
@@ -21,7 +21,8 @@ import java.nio.charset.Charset;
 import org.springframework.util.Assert;
 
 /**
- * Represents a SockJS frame and provides factory methods for creating SockJS frames.
+ * Represents a SockJS frame. Provides factory methods to create SockJS frames on
+ * the server side.
  *
  * @author Rossen Stoyanchev
  * @since 4.0
@@ -30,21 +31,29 @@ public class SockJsFrame {
 
 	private static final Charset UTF8_CHARSET = Charset.forName("UTF-8");
 
-	private static final SockJsFrame openFrame = new SockJsFrame("o");
+	private static final SockJsFrame OPEN_FRAME = new SockJsFrame("o");
 
-	private static final SockJsFrame heartbeatFrame = new SockJsFrame("h");
+	private static final SockJsFrame HEARTBEAT_FRAME = new SockJsFrame("h");
 
-	private static final SockJsFrame closeGoAwayFrame = closeFrame(3000, "Go away!");
+	private static final SockJsFrame CLOSE_GO_AWAY_FRAME = closeFrame(3000, "Go away!");
 
-	private static final SockJsFrame closeAnotherConnectionOpenFrame = closeFrame(2010, "Another connection still open");
+	private static final SockJsFrame CLOSE_ANOTHER_CONNECTION_OPEN_FRAME = closeFrame(2010, "Another connection still open");
 
 
+	private final String content;
+
+
+	public SockJsFrame(String content) {
+		Assert.notNull("Content must not be null");
+		this.content = content;
+	}
+
 	public static SockJsFrame openFrame() {
-		return openFrame;
+		return OPEN_FRAME;
 	}
 
 	public static SockJsFrame heartbeatFrame() {
-		return heartbeatFrame;
+		return HEARTBEAT_FRAME;
 	}
 
 	public static SockJsFrame messageFrame(SockJsMessageCodec codec, String... messages) {
@@ -53,11 +62,11 @@ public class SockJsFrame {
 	}
 
 	public static SockJsFrame closeFrameGoAway() {
-		return closeGoAwayFrame;
+		return CLOSE_GO_AWAY_FRAME;
 	}
 
 	public static SockJsFrame closeFrameAnotherConnectionOpen() {
-		return closeAnotherConnectionOpenFrame;
+		return CLOSE_ANOTHER_CONNECTION_OPEN_FRAME;
 	}
 
 	public static SockJsFrame closeFrame(int code, String reason) {
@@ -65,15 +74,6 @@ public class SockJsFrame {
 	}
 
 
-	private final String content;
-
-
-	public SockJsFrame(String content) {
-		Assert.notNull("Content must not be null");
-		this.content = content;
-	}
-
-
 	public String getContent() {
 		return this.content;
 	}
@@ -82,6 +82,7 @@ public class SockJsFrame {
 		return this.content.getBytes(UTF8_CHARSET);
 	}
 
+
 	@Override
 	public boolean equals(Object other) {
 		if (this == other) {