Use default phase 0 for WebSocket messaging

Closes gh-27519

spring-websocket/src/main/java/org/springframework/web/socket/config/annotation/WebSocketMessageBrokerConfigurer.java

@@ -117,11 +117,9 @@ public interface WebSocketMessageBrokerConfigurer {
 	 * handling beans of type {@link SmartLifecycle} should run in.
 	 * <p>The default implementation returns {@code null} which allows other
 	 * configurers to decide. As soon as any configurer returns a value, that
-	 * value is used. If no configurer returns a value, then by default
-	 * {@link SmartLifecycle#DEFAULT_PHASE} is used.
+	 * value is used. If no configurer returns a value, then 0 is used.
 	 * <p>It is recommended to use a phase value such as 0 in order to ensure that
-	 * components start before the web server in Spring Boot application. In 6.2.0,
-	 * the default used will change to 0.
+	 * components start before the web server in Spring Boot application.
 	 * @since 6.1.4
 	 * @see SmartLifecycle
 	 */

spring-websocket/src/main/java/org/springframework/web/socket/messaging/SubProtocolWebSocketHandler.java

@@ -254,7 +254,8 @@ public class SubProtocolWebSocketHandler
 
 	/**
 	 * Set the phase that this handler should run in.
-	 * <p>By default, this is {@link SmartLifecycle#DEFAULT_PHASE}.
+	 * <p>By default, this is {@link SmartLifecycle#DEFAULT_PHASE}, but with
+	 * {@code @EnableWebSocketMessageBroker} configuration it is set to 0.
 	 * @since 6.1.4
 	 */
 	public void setPhase(int phase) {

spring-websocket/src/main/java/org/springframework/web/socket/server/support/WebSocketHandlerMapping.java

@@ -62,7 +62,8 @@ public class WebSocketHandlerMapping extends SimpleUrlHandlerMapping implements
 
 	/**
 	 * Set the phase that this handler should run in.
-	 * <p>By default, this is {@link SmartLifecycle#DEFAULT_PHASE}.
+	 * <p>By default, this is {@link SmartLifecycle#DEFAULT_PHASE}, but with
+	 * {@code @EnableWebSocketMessageBroker} configuration it is set to 0.
 	 * @since 6.1.4
 	 */
 	public void setPhase(int phase) {