Public method to register MessagingAdviceBean

Closes gh-26636

Author: rstoyanchev

spring-messaging/src/main/java/org/springframework/messaging/handler/annotation/reactive/MessageMappingMessageHandler.java

@@ -44,6 +44,7 @@
 import org.springframework.messaging.handler.CompositeMessageCondition;
 import org.springframework.messaging.handler.DestinationPatternsMessageCondition;
 import org.springframework.messaging.handler.HandlerMethod;
+import org.springframework.messaging.handler.MessagingAdviceBean;
 import org.springframework.messaging.handler.annotation.MessageMapping;
 import org.springframework.messaging.handler.annotation.support.AnnotationExceptionHandlerMethodResolver;
 import org.springframework.messaging.handler.invocation.AbstractExceptionHandlerMethodResolver;
@@ -189,6 +190,40 @@ public void setEmbeddedValueResolver(StringValueResolver resolver) {
 		this.valueResolver = resolver;
 	}
 
+	/**
+	 * Use this method to register a {@link MessagingAdviceBean} that may contain
+	 * globally applicable
+	 * {@link org.springframework.messaging.handler.annotation.MessageExceptionHandler @MessageExceptionHandler}
+	 * methods.
+	 * <p>Note: spring-messaging does not depend on spring-web and therefore it
+	 * is not possible to explicitly support the registration of a
+	 * {@code @ControllerAdvice} bean. You can use the following adapter code
+	 * to register {@code @ControllerAdvice} beans here:
+	 * <pre>
+	 * ControllerAdviceBean.findAnnotatedBeans(context).forEach(bean ->
+	 *         messageHandler.registerMessagingAdvice(new ControllerAdviceWrapper(bean));
+	 *
+	 * public class ControllerAdviceWrapper implements MessagingAdviceBean {
+	 *     private final ControllerAdviceBean delegate;
+	 *     // delegate all methods
+	 * }
+	 * </pre>
+	 *
+	 * @param bean the bean to check for {@code @MessageExceptionHandler} methods
+	 * @since 5.3.5
+	 */
+	public void registerMessagingAdvice(MessagingAdviceBean bean) {
+		Class<?> type = bean.getBeanType();
+		if (type != null) {
+			AnnotationExceptionHandlerMethodResolver resolver = new AnnotationExceptionHandlerMethodResolver(type);
+			if (resolver.hasExceptionMappings()) {
+				registerExceptionHandlerAdvice(bean, resolver);
+				if (logger.isTraceEnabled()) {
+					logger.trace("Detected @MessageExceptionHandler methods in " + bean);
+				}
+			}
+		}
+	}
 
 	@Override
 	public void afterPropertiesSet() {