Fix ControlBusControllerConfiguration for FormattingConversionService

* Use `ObjectProvider<FormattingConversionService>` instead for injection
to resolve the target bean later when we check that `spring-mvc` or `spring-webflux` is present in classpath
* Fix `control-bus-controller.adoc` for `{beanName}` attribute resolution attempt

Author: artembilan

spring-integration-http/src/main/java/org/springframework/integration/http/config/ControlBusControllerConfiguration.java

@@ -19,7 +19,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -46,18 +46,17 @@ public class ControlBusControllerConfiguration {
 
 	@Bean
 	ControlBusController controlBusController(ControlBusCommandRegistry controlBusCommandRegistry,
-			@Qualifier("mvcConversionService") FormattingConversionService conversionService) {
+			ObjectProvider<FormattingConversionService> conversionService) {
 
 		if (!HttpContextUtils.WEB_MVC_PRESENT && !HttpContextUtils.WEB_FLUX_PRESENT) {
 			LOGGER.warn("The 'IntegrationGraphController' isn't registered with the application context because" +
-					" there is no 'org.springframework.web.servlet.DispatcherServlet' or" +
-					" 'org.springframework.web.reactive.DispatcherHandler' in the classpath.");
+					" there is no 'spring-mvc' or 'spring-webflux' in the classpath.");
 			return null;
 		}
 
 		controlBusCommandRegistry.setEagerInitialization(true);
 
-		return new ControlBusController(controlBusCommandRegistry, conversionService);
+		return new ControlBusController(controlBusCommandRegistry, conversionService.getIfUnique());
 	}
 
 }

src/reference/antora/modules/ROOT/pages/http/control-bus-controller.adoc

@@ -69,7 +69,7 @@ The `/control-bus` GET request returns all the control bus commands for the appl
 Essentially, a JSON-serialized list of `ControlBusController.ControlBusBean` instances.
 Each entry is a bean with a list of control bus eligible methods (see `ControlBusMethodFilter` for more information) with their parameter types and description from the `@ManagedOperation` or `@ManagedAttribute` (falls back to method name otherwise).
 
-The GET method of this REST controller for `/control-bus/{beanName}` returns commands for specific bean.
+The GET method of this REST controller for `/control-bus/\{beanName}` returns commands for specific bean.
 
 The POST method to `/control-bus/{beanName.methodName}` invokes the command.
 The body of the request may contain a list of values and their types for command to execute.